Year: 2026

Product Overview

The Siemens 6EP1334-2BA20 is a high-performance SITOP PSU100S series stabilized power supply designed for DIN rail mounting in industrial control cabinets. This switched-mode power supply delivers a reliable 24V DC output at 10A, providing 240W of continuous power with peak capacity up to 288W . The 6EP1334-2BA20 Siemens unit accepts a wide-range AC input of 85-132V or 170-264V with automatic voltage range switching, making it suitable for global deployment in diverse industrial environments .

As a versatile member of the SITOP smart family, the Siemens 6EP1334-2BA20 is engineered for universal use in machinery and plant engineering applications. Its compact design—measuring just 70mm in width—requires no lateral installation clearances, enabling space-efficient integration into control cabinets . The power supply features an impressive efficiency of approximately 90%, ensuring minimal energy consumption and reduced heat generation inside enclosures . With a wide operating temperature range from -25°C to 70°C and comprehensive international certifications including CE, cULus, and ATEX, the 6EP1334-2BA20 delivers reliable performance across demanding industrial applications while providing the flexibility and protection needed for modern automation systems .

Technical Specifications

Main Features and Advantages

The Siemens 6EP1334-2BA20 distinguishes itself through exceptional overload capability and robust performance. With a permanent overload capacity of 120% of rated power and a temporary power boost of 150% for brief functional loads, the 6EP1334-2BA20 Siemens can reliably handle motor startups and other high-inrush loads without interruption . This feature provides ample reserve power for system expansions, allowing additional components to be connected without requiring a larger power supply unit.

The advanced protection features of the Siemens 6EP1334-2BA20 ensure maximum system availability. Built-in short circuit protection, overvoltage protection (OVP), and overload protection (OPP) safeguard both the power supply and connected loads from damage . The primary/secondary galvanic isolation provides SELV (Safety Extra Low Voltage) output compliant with EN 60950-1 and EN 50178 standards, ensuring safe operation for personnel and equipment .

Integration and monitoring capabilities enhance the 6EP1334-2BA20‘s value in automation systems. A dedicated signalling contact provides “output voltage OK” status, enabling easy integration into plant monitoring and SCADA systems . The adjustable output voltage allows compensation for voltage drops in long cable runs, ensuring consistent 24V delivery at the load. Additional features include LED status indication, parallel connection capability for higher power requirements, and compliance with radio interference suppression Class B for stable operation in sensitive environments .

Product Overview

The Siemens 6EP1332-2BA20​ is the entry-capacity member of Siemens’ SITOP PSU100S family—a 60 W, 24 V DC / 2.5 A primary-switched stabilized power supply built for DIN-rail mounting in industrial control cabinets where a compact, cost-effective, and certification-heavy 24 V rail is needed to feed PLC I/O, analog transmitters, valve positioners, encoder electronics, and DCS aux loads. Rated for single-phase 120/230 V AC auto-ranging input (50/60 Hz, TN/TT networks per VDE 0100 / IEC 364-3), the Siemens 6EP1332-2BA20​ delivers a floating (SELV) +24 V DC output that is short-circuit-proof, no-load-proof, and adjustable from 22.8 V to 28 V via an on-board potentiometer—handy when the cabinet’s 24 V rail needs to be nudged up to compensate for cable volt-drop across a long marshalling run to a field junction box.Positioned as the “light-duty workhorse” of the SITOP lineup, the Siemens 6EP1332-2BA20​ sits below the PSU300S (which adds selective fuse monitoring and wider-range input) and the newer PSU6200 (IO-Link enabled), but for the vast majority of S7-300/400 cabinets, ET 200 distributed nodes, SICOMP aux supplies, and Teleperm M / SPPA-T3000 24 V aux rails, 60 W is exactly the right size: enough for 8–12 analog transmitters plus a handful of DI/DO modules, without over-speccing the cabinet depth or the branch MCB budget. The unit is IP20, Protection Class I, 35 mm DIN-rail form factor, with screw terminals accepting 0.5–2.5 mm² conductors, a green “24 V OK” LED, and a normally-open relay contact (60 V DC / 0.3 A) that can drive a PLC DI or a cabinet alarm beacon when the output falls out of regulation—an often-underused but valuable feature for predictive maintenance.Certifications are where the Siemens 6EP1332-2BA20​ punches above its price: CE, UL 508 / CSA C22.2, cULus, DNV GL (maritime), and ATEX / IECEx Ex nA nC IIC T4 Gc for Zone 2 / Division 2 hazardous-area installations when mounted inside an IP54+ enclosure. Combined with >180 000 hour MTBF, –25 °C to +60 °C operating range (derated above +60 °C to +70 °C), and 85 % typical efficiency at rated load, the 6EP1332-2BA20 is the unit-spec default for EPCs who need one 24 V supply SKU to cover general-purpose cabinets, skid-mounted panels, and light process enclosures without opening a separate hazardous-area BOM line.

Technical Specifications

Main Features and Advantages

60 W compact footprint with 85 % efficiency.​ The Siemens 6EP1332-2BA20​ is sized for the “one-slot” feeling on a 35 mm DIN rail—narrow enough that three of them fit side-by-side in a 200 mm wide micro-cabinet, yet 60 W is enough to run a typical S7-314 CPU + 16-DI + 16-DO + 4 analog transmitters without breathing hard. At ~85 % efficiency the unit dissipates only about 10 W at full load, keeping the cabinet’s internal ambient from ratcheting up—important in sealed enclosures on skid packages where the only cooling is convection through the vent strips.Adjustable 22.8–28 V output via on-board potentiometer.​ While most plants run PSU100S at the default 24.0 V, the trim pot on the Siemens 6EP1332-2BA20​ exists for a reason: a cabinet feeding 4–20 mA transmitters on a long home-run to a tank farm may drop 0.8 V across the marshalling and field cable. Rather than upsizing the cable, bump the PSU to 25.5 V at the source—the transmitter still sees ≥23.6 V at the tail, keeping it in its 24 V ±10 % operating window. The pot is a small slotted brass screw accessible through the front vent; Siemens warns (and the Siemens 6EP1332-2BA20​ labeling echoes) not to adjust it in explosive-atmosphere conditions, but for normal cabinets it’s a five-second tweak with a screwdriver.Green LED + relay-contact “24 V OK” signal.​ A detail many plants under-use: the front green LED is obvious, but the hidden value is the NO relay contact rated 60 V DC / 0.3 A. Wire that contact to a spare DI on the PLC, or to a cabinet-alarm annunciator, and the PLC can detect “PSU lost regulation” before the 24 V rail collapses far enough to drop I/O. In a cabinet where the Siemens 6EP1332-2BA20​ feeds safety-relevant loops (ESD valve solenoids, fire-pump start permissives), that relay contact becomes part of the monthly proof-test checklist—if the DI doesn’t see “24V OK” at power-up, the tech knows the PSU is limping before the valves start misbehaving.150 % overload for 5 seconds per minute + parallel capability.​ The Siemens 6EP1332-2BA20​ is specified to deliver 3.75 A (150 % of 2.5 A) for 5 s out of every 60 s—designed for inrush scenarios like capacitive loads on analog transmitters all powering up together, or a small motorized damper actuator that briefly draws 3 A on stall. For applications needing a bit more headroom without jumping to the 5 A sibling, two 6EP1332-2BA20 units can be paralleled (up to 2 units) for current sharing, giving 5 A total with rudimentary redundancy. It’s not a true redundant topology (no decoupling diodes built in; Siemens recommends external OR-ing if N+1 is required), but for non-safety skids it’s a cost-effective way to get 5 A from two 60 W units instead of one 120 W.Short-circuit proof with constant-current characteristic.​ On a sustained short (tech drops a screwdriver across the 24 V terminals—yes, it happens), the Siemens 6EP1332-2BA20​ folds back to a constant ~3.4 A, then into hiccup until the fault clears. Typical short-circuit delivery is ~9 A for 100 ms at startup or 800 ms during run, then current-limits. This protects both the PSU and the wiring (the recommended branch protection is a 3 A C-curve MCB per IEC 898, with an internal T 3.15 A / 250 V input fuse that is not user-replaceable—so the MCB is the serviceable element). For cabinets where “someone will eventually short something” is a given, this behavior keeps the PSU alive through the tech’s mistake.Certification breadth for a 60 W unit.​ The Siemens 6EP1332-2BA20​ carries ATEX / IECEx Ex nA nC IIC T4 Gc (Zone 2 / Div 2) when installed inside an IP54+ enclosure, plus DNV GL for marine/offshore topsides, plus UL 508 and CSA for North American panels. For EPCs doing multi-region projects, specifying the 6EP1332-2BA20 means one BOM line works in a German chemical plant, a Gulf Coast refinery skid, and a North Sea platform utility cabinet without splitting into regional variants. That’s why the model shows up in so many standard “cabinet-builder kits” from the big system integrators.

Product Overview

The Siemens 6EP1336-3BA10 is a high-performance DIN rail-mounted power supply from the renowned SITOP modular series, specifically designed to meet the demanding power requirements of modern industrial automation systems. This switched-mode power supply delivers a stable 24 V DC output at 20 A, providing a total output power of 480 W with an exceptional efficiency rating of 93% . The Siemens 6EP1336-3BA10 features a universal input range of 85 to 275 V AC and 88 to 350 V DC, making it suitable for global deployment across various power grid configurations . As part of the SITOP PSU8200 product family, the Siemens 6EP1336-3BA10 is engineered with advanced features including selectable short-circuit response, parallel operation capability, and an integrated power boost function that delivers up to three times the rated current for short durations to reliably start heavy loads.

The Siemens 6EP1336-3BA10 stands out in the SITOP modular lineup due to its compact metal housing and flexible configuration options. The module includes a DIL switch for selecting between two distinct operating modes: parallel operation with a soft droop characteristic, or latching shutdown for critical overload protection . The Siemens 6EP1336-3BA10 provides SELV (Safety Extra Low Voltage) output according to EN 60950-1 and EN 50178 standards, with galvanic isolation between primary and secondary circuits ensuring safe operation in sensitive control applications . With its IP20 protection class, wide operating temperature range of -25 to 70°C, and comprehensive protection features including overcurrent, overvoltage, overtemperature, and short-circuit protection, the Siemens 6EP1336-3BA10 delivers reliable power for mission-critical industrial control systems .

Technical Specifications

Product Overview

The 6EP1334-3BA00​ is a Siemens SITOP PSU200M-series stabilized power supply delivering 24 V DC at 10 A (240 W nominal), purpose-built for control-cabinet deployments where a robust, wide-input, DIN-rail-mountable 24 V backbone is required to feed PLCs, distributed I/O racks, HMI panels, safety modules, solenoid valves, and 24 V field sensors. As a member of the SITOP modular “PSU200M” family, the 6EP1334-3BA00​ is positioned between the compact SITOP smart line and the premium PSU8600/PSU8200 tiers—offering the full industrial feature set (adjustable output, parallel capability, power-boost, signal-module expansion) without the communications-layer overhead of the top-tier units. The module accepts single-phase or two-phase AC mains across a exceptionally wide range: 120–230 V AC or 230–500 V AC, selector-switch set on the front face, with a respective low-range of 85–264 V and high-range of 176–550 V, making the 6EP1334-3BA00​ genuinely global-grid capable without jumper or firmware change.The output stage on the 6EP1334-3BA00​ is regulated to 24 V DC with ±3 % static tolerance, adjustable via front-panel potentiometer from 24 V up to 28.8 V to compensate for cable-drop in long 24 V feeder runs—a common pain point in large MCC cabinets where the PSU sits at the top and the farthest I/O drop sees 22 V under load. Ripple is held below 50 mVpp with spike suppression under 200 mVpp (20 MHz BW), protecting sensitive analog-front-end electronics downstream. A green LED flags “24 V OK”; a yellow LED indicates overload condition; a red LED flags a short-circuit/overload shutdown event, and full signaling can be externalized via the optional SITOP signal module (6EP1961-3BA10) clipped directly onto the 6EP1334-3BA00​ right-side bus—no wiring needed. With 87 % efficiency at full load, natural convection cooling, –25 °C to +70 °C operating range (derating above +60 °C), 90 × 125 × 125 mm footprint on a 35 mm DIN rail (EN 60715), and certifications spanning CE, UL/cUL, cCSAus Class I Div 2, ATEX II 3G, GL, and ABS, the 6EP1334-3BA00​ is the canonical 10 A PSU spare for plants standardized on SITOP PSU200M.

Technical Specifications

Product Overview

The Siemens 6EP1334-1SL12, a core member of the SITOP POWER 10 series, is a high-performance, regulated single-phase power supply designed to deliver stable and reliable DC power for demanding industrial automation environments. This power supply module converts AC mains voltage into a regulated 24 V DC output with a robust 10 A current capacity, making it the ideal power source for a wide array of automation components such as SIMATIC S7-300/400 PLCs, distributed I/O systems, sensors, actuators, and other 24 V DC loads. The Siemens 6EP1334-1SL12 is engineered to meet the rigorous demands of industrial control cabinets, offering a compact S7-300 design that enables efficient use of space and straightforward snap-on mounting to standard 35 mm DIN rails (EN 50022).

The versatility and reliability of the Siemens 6EP1334-1SL12 are evident in its universal input design. It features a wide-range input that automatically adapts to AC voltages from 85 V to 264 V and DC voltages from 110 V to 300 V, allowing for seamless integration into power grids worldwide without the need for manual voltage selection. This power supply is built with robust protection mechanisms, including short-circuit and overload protection with a constant current characteristic, ensuring that both the power supply and connected loads are safeguarded from electrical faults. The Siemens 6EP1334-1SL12 provides a green LED indicator for “24 V OK” status, offering immediate visual confirmation of normal operation. With a high efficiency rating of approximately 90%, this module minimizes power loss and heat generation, contributing to the long-term reliability and energy efficiency of the overall automation system.

Technical Specifications

Application Scenarios

In a combined-cycle power plant’s TXP auxiliary cabinet — the one housing the 6DS1312-8BB​ IM modules and a string of 6DP1232-8AA​ FUM 232 temperature cards we covered earlier — the original PSU (a 15-year-old 6EP1332-2BA00) began showing its age. During a summer afternoon when the plant stepped a 6 kV feeder and the 230 V AC mains dipped to 187 V for ~40 ms, the old PSU’s hold-up expired, dragging the FUM rack into a brownout reset. The TXP OM lit up with a cascade: “IM bus lost,” “FUM 232 Ch.7 wire-break phantom,” “AP scan mismatch.” The real culprit wasn’t the FUM or the IM — it was the PSU’s 12 ms buffer falling short. The maintenance team swapped in a Siemens 6EP1332-2BA10: the new unit’s 20 ms mains buffering at Vin = 187 V (per the RS datasheet spec) held the 24 V rail through the same dip during a repeat test, and the selector switch was already set to 230 V position matching the cabinet’s European supply. More tangibly, the 6EP1332-2BA10​ was then paralleled with a second unit (N+1, up to 2 units per Siemens spec) so that a future PSU fault would be transparent — the green LED on the degraded unit dimmed, the sister carried the 2.1 A combined load of the 6DS/6DP rack plus a few DI/DO carriers, and the plant logged zero TXP rack resets in the 18 months since. For this cabinet, the 6EP1332-2BA10​ wasn’t a glamorous upgrade — it was the quietest 60 watts in the room.

Parameter

Technical Principles and Innovative Values

• Innovation Point 1 – Selector-Switch Wide-Range Input Without External Auto-Ranging.​ The 6EP1332-2BA10​ takes a deliberately pragmatic approach: a physical slider lets the installer pick 120 V or 230 V AC, while each range covers a wide window (85–132 / 170–264 V). This avoids the complexity (and failure modes) of auto-ranging front-ends, yet still tolerates global site variances — a panel built in Germany (230 V) and shipped to a US skid (120 V) just needs a slider flip, not a rewire.
• Innovation Point 2 – 20 ms Mains Buffering at Deep Dip.​ Most compact 60 W PSUs spec 10–15 ms hold-up. The 6EP1332-2BA10​ is rated ≥20 ms at Vin = 93/187 V (the IEC 61131-2 “brownout” threshold). In practice this means a downstream Teleperm M AP rack or S7-1500 won’t see a 24 V collapse during a feeder step, generator transfer, or minor grid disturbance — the kind of event that otherwise triggers phantom FUM/IM bus faults.
• Innovation Point 3 – Parallel-N+1 in a 32.5 mm Body.​ Despite its compact footprint, the 6EP1332-2BA10​ supports parallel operation of up to two units (Siemens explicitly documents this for “enhanced performance”). In DCS aux-rail duty — where a single PSU feeds 6DS1-series modules, IM cards, and maybe a small ET 200 head — paralleling two 6EP1332-2BA10​ units gives N+1 redundancy: one can fail (or be pulled for swap) while the other carries the steady load, with no scan interruption upstream.
• Innovation Point 4 – Constant-Current Short-Circuit with Auto-Recovery.​ Rather than a hiccup-mode or latch-off, the 6EP1332-2BA10​ goes to constant-current limiting (~3.2–3.4 A) on short, retries automatically when the fault clears. For a cabinet where a field tech might inadvertently short a 24 V sense lead during commissioning, this means the PSU recovers silently once the screwdriver lifts — no circuit-breaker trip, no “why is the FUM rack dark” mystery.

Description

The SIEMENS 6ED1057-1AA00-0BA0 is the official PC programming cable for the Siemens LOGO! family of intelligent logic modules, designed to establish a reliable physical communication link between a PC (or programming device) and the LOGO! controller . This 2.5-meter cable serves as the essential “handshake” between engineering software and the hardware, enabling program transfer, online monitoring, and system parameterization .

The SIEMENS 6ED1057-1AA00-0BA0 features an RS-232 serial interface (DB9 female connector) on the PC side and a proprietary programming port connector on the LOGO! side . While Siemens now offers a USB version (6ED1057-1AA01-0BA0), the 6ED1057-1AA00-0BA0 remains a crucial accessory for maintaining and servicing legacy LOGO! installations that rely on traditional serial communication .

Application Scenarios

In a food and beverage packaging line in the Midwest United States, an OEM panel builder was commissioning a new conveyor control system based on a Siemens LOGO! 24RC module. The engineer needed to download a ladder logic program from their laptop to the controller but discovered the USB cable was left at the office. A spare SIEMENS 6ED1057-1AA00-0BA0 cable from the maintenance kit was deployed, instantly restoring connectivity. Within minutes, the program was downloaded, the conveyor timing sequences were adjusted online, and the line was running at full speed. The site manager noted: “The SIEMENS 6ED1057-1AA00-0BA0 saved us from a four-hour delay waiting for the right cable. It’s the unsung hero of our LOGO! commissioning work.”

The SIEMENS 6ED1057-1AA00-0BA0 also proves invaluable in legacy system support. Many building automation systems, HVAC damper interlocks, and street-lighting controllers installed in the 1990s and early 2000s still use LOGO! 0BA0–0BA6 modules . When these systems require parameter updates or troubleshooting, the SIEMENS 6ED1057-1AA00-0BA0 is the only reliable way to connect, as newer USB cables may not be fully compatible with older LOGO! firmware revisions .

Parameters

Description:

The Siemens 6ED1055-1MB00-0BA1​ is a digital I/O expansion module branded as LOGO! DM8 12/24R, produced by Siemens AG under the LOGO! 8 (0BA8) micro-logic controller family. Classified as a plug-on expansion module, it adds 4 digital inputs (12/24 V DC) and 4 relay outputs (5 A resistive / 3 A inductive) to a LOGO! 8 base unit, mounting directly to the right-hand side of the host with automatic internal-bus recognition — no ribbon cables, no separate 24 V feed, no addressing dip-switches.

Application Scenarios:

A small municipal sewage lift station in Bavaria runs three duty/standby submersible pumps controlled by a LOGO! 8 base unit (6ED1052-…) that originally handled only 8 DI / 4 DO — enough for float switches, hand-off-auto selectors, and pump contactors, but tight. When the municipality added a storm-water overflow gate and a local high-level alarm beacon, the I/O budget ran dry. Rather than upsizing to a full S7-1200 rack (which would have meant a new panel, new wiring, and a TIA Portal rewrite), the integrator snapped a Siemens 6ED1055-1MB00-0BA1​ onto the LOGO! host’s right side — 2 TE wider, same DIN row, internal bus auto-enumerated on power-up. The four new DI picked up the overflow gate limit switches and a remote HOA; the four relay outputs drove the gate actuator contactor, the alarm beacon, and two spare loops for future sump heaters. Total on-site time: 45 minutes including wiring the 8 new field terminals. For OEMs building compact machines — car-wash sequences, small conveyor interlocks, HVAC damper banks, door/gate controls, fish-farm aerator timers — the Siemens 6ED1055-1MB00-0BA1​ is the difference between “fits in the existing enclosure” and “we need a bigger cabinet.”

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Technical Principles and Innovative Values:

• Innovation Point 1: Zero-cable internal bus expansion.​ The Siemens 6ED1055-1MB00-0BA1​ clips mechanically and electrically onto the right-hand data connector of a LOGO! 8 base unit — power, I/O image, and diagnostics all flow across the molded bus bar without a single jumper wire. Compared with S7-200/300 SM expansion (ribbon or Profibus cable, separate power), this cuts panel build time by ~30% on small machines.
• Innovation Point 2: 12/24 V DC input with 10.8–28.8 V tolerance.​ The Siemens 6ED1055-1MB00-0BA1​ accepts both 12 V battery-sourced panels (solar pump stations, mobile machines) and 24 V industrial supplies, making one BOM cover both stationary and semi-mobile OEM skids — a flexibility pure-24 V modules don’t offer.
• Innovation Point 3: 5 A relay direct-drive per channel.​ Most micro-PLC expansion tops out at 2 A transistor; the Siemens 6ED1055-1MB00-0BA1‘s 5 A relay contacts can pick up a 3 A contactor coil, a solenoid, or a small beacon straight from the terminal — no interposing relay, no panel-space penalty. At 1000 W lighting load rating, it also handles cabin/flood light groups directly.
• Innovation Point 4: EN 55011 Class B residential rating.​ The Siemens 6ED1055-1MB00-0BA1​ is certified for living-area EMC, meaning it’s legal in building-side panels (HVAC plant rooms, small wastewater kiosks, door-control cabinets) without extra suppression — a detail that matters for OEMs selling into municipal or residential projects.

Application Scenarios

Imagine a commercial building manager needing to automate lighting, sun blinds, and HVAC schedules without the complexity and cost of a full PLC system. The Siemens 6ED1052-1MD00-0BA7 provides an elegant solution with its built-in display and intuitive programming interface . Alternatively, in a small machinery OEM setting, an engineer uses the 6ED1052-1MD00-0BA7 to control a gate system or rainwater pump, leveraging the module’s 400-block memory and real-time clock for precise timing sequences . In a retrofit scenario, an existing 0BA6 LOGO! unit fails; the Siemens 6ED1052-1MD00-0BA7 steps in as a direct upgrade with enhanced Ethernet communication and expanded program memory—saving the operator from expensive system redesign and downtime.

Parameters

Technical Principles and Innovative Values

• Innovation Point 1 – Ethernet Integration for Modern Networking: Unlike its predecessors, the Siemens 6ED1052-1MD00-0BA7 features a standard Ethernet interface as its hallmark upgrade . This serves as both a high-speed programming port and a communication link to other LOGO! 0BA7 devices, SIMATIC S7 CPUs, HMI panels, and PCs . Up to eight 6ED1052-1MD00-0BA7 modules can be networked via Ethernet, enabling distributed control architectures .
• Innovation Point 2 – Expanded Memory and Advanced Function Blocks: With 400 function blocks—double the capacity of earlier 0BA6 models—the Siemens 6ED1052-1MD00-0BA7 can handle more complex programs . New features include astronomical clock functions, min/max value tracking, average calculation, analog filtering, stopwatch, macro and library functions, and data logging to SD card (supports up to 8GB) . This expanded capability allows the 6ED1052-1MD00-0BA7 to tackle applications that previously required a more expensive PLC.
• Innovation Point 3 – Flexible I/O with Analog Input Capability: The Siemens 6ED1052-1MD00-0BA7 provides 8 digital inputs, but four of these can be switched to analog input mode (0–10V) . This dual-functionality is a significant cost-saver, allowing direct connection of analog sensors such as temperature probes or pressure transducers without requiring additional analog input modules.
• Innovation Point 4 – Robust Communication and Diagnostics: The integrated web server of the Siemens 6ED1052-1MD00-0BA7 allows operators to monitor I/O states and network status via a standard browser, providing convenient remote diagnostics . The module also supports Modbus TCP communication in both server and client modes, enabling connectivity with third-party devices such as energy meters or generic sensors . LED indicators provide real-time feedback on power, Ethernet link, program execution, and fault status .

Description

The Siemens 6ED1052-1MD08-0BA0​ is a LOGO! 12/24RCE logic module manufactured by Siemens, part of the LOGO! 8.2 (FS02) generation of compact intelligent logic controllers. It belongs to the category of palm-sized programmable logic modules designed for small-scale automation tasks where a full PLC/DCS is overspecified but relay-timer logic is too rigid. The module combines 8 digital inputs (4 of which are switchable to 0–10 V analog), 4 relay outputs rated at 10 A, onboard Ethernet with integrated web server, data logger, and a 400-block program memory — all in a 71.5 × 90 × 60 mm DIN-rail housing powered from 12/24 V DC.

Application Scenarios

A municipal stormwater pumping station in a mid-size German town was running on a 1990s vintage electromechanical timer panel: two 4 kW submersible pumps on duty/standby, level sensed by three float switches, and a third “alarm” pump that never seemed to trigger when it should. During a heavy autumn storm, the timer-relay sequence hung — one pump burned out on dry run because the float logic didn’t see the low-level reset, and the station overflowed into the adjacent bike path. The municipality had €12K budget, not €80K for a full S7-1200 + HMI retrofit. The contractor dropped a Siemens 6ED1052-1MD08-0BA0​ into a spare 4-unit DIN slot in the existing cabinet: 12 V DC came from the station’s battery-backed supply, the three floats wired to DI1–DI3, and a 0–10 V pressure transducer on the wet well (already installed but unused on the old panel) landed on DI4 configured as analog. The 4 relay outputs drove the two pump contactors, the alarm horn, and a telemetry dry-contact to the SCADA hut 800 m away.Commissioning took one afternoon with LOGO!Soft Comfort V8.3: duty/standby alternating, pump run-hour balancing, low-level dry-run lockout with a 30-second delay (using the built-in PI-controller function block to smooth the pressure-transducer signal), and — the feature the facility manager actually uses daily — the integrated web server was enabled with a custom page showing pump status, wet-well level in %, and last-alarm timestamp. No HMI, no extra gateway: the station’s existing LAN reached the cabinet, and the manager pulls the LOGO!’s webpage on his phone. Six months later, a second storm event hit; the 6ED1052-1MD08-0BA0​ caught the rising level at 82%, auto-started pump 1, brought pump 2 online at 88%, and the manager got a browser refresh showing “P2 RUN” before the first overflow alarm would have fired. Total install cost: €340 for the module + 6 hours labor. The old timer panel is now a museum piece on the workshop shelf.

Key Parameters