Product Overview

The ABB 1SFB536068D1013​ is an 8-channel digital input / 8-channel digital output low-voltage I/O module in ABB’s 1SFB Low Voltage Products lineup, delivering 24 V DC mixed DI/DO over a self-contained Modbus RTU (RS-485) interface — no dedicated communication interface unit (CI801/CI840) and no S800 rack required. Its primary positioning is the “small DCS retrofit” problem: a plant running AC800M or 800xA wants eight more DI and eight more DO at a satellite panel 30 metres from the main rack, but specifying a full S800 slice + TU + CI module + Profibus/ModuleBus cabling is overspent for sixteen points. The ABB 1SFB536068D1013​ solves that by sitting on a 35 mm DIN rail, pulling 24 V DC from the local panel PSU (often the 1KHL178012R0016A TRM01​ covered earlier in this catalog), and landing on the DCS’s serial port as a Modbus RTU slave — the AC800M’s serial interface module (or any PLC/SCADA with Modbus RTU master) reads/writes the 16 coils/discretes directly.Beyond the DCS-extension role, the 1SFB536068D1013​ carries a second identity that matters for MRO: it is specified as the driver / I/O board inside ABB PST and PSTB series soft starters — specifically units like the PST105-600-70 and PSTB105 (105 A class), where the module handles the 24 V DC control-logic side: reading the panel START/STOP/RESET pushbuttons and overload-aux contacts (the 8 DI), and driving the internal relays, bypass contactor coil, warning horn, and fault LED (the 8 DO at 0.5 A per transistor output, short-circuit protected). In that context the ABB 1SFB536068D1013​ may mount internally on standoffs inside the PST/PSTB cubicle rather than on DIN rail — the same P/N serves both roles, and the BOM decides which.Physically the 1SFB536068D1013​ is a compact block — sources differ on exact envelope (≈120 × 106 × 44 mm / ~0.25 kg per most LV-distributor docs, though a few ABB-drive-family listings show 100 × 100 × 70 mm / ~0.5 kg, likely a different mounting variant) — IP20, –25 °C to +70 °C operating (wider cold-start than the S800/AO810V2 0–55 class, which matters for unheated MCC rooms and outdoor soft-starter kiosks), IEC 61131-2 compliant, CE/UL/CSA. The 1SFB536068D1013​ is not hot-swap, not analog-capable, not HART/profibus/ModuleBus — it is a focused 8+8 24 V DC Modbus-RTU node, and that focus is why it undercuts an S800+CI build by a factor of three on small-point-count jobs.

Technical Specifications

Main Features and Advantages

Standalone Modbus RTU — no CI/communication module tax.​ The ABB 1SFB536068D1013​ speaks Modbus RTU natively over RS-485, which means it lands on an AC800M serial port, a Freelance AC 800F’s Modbus master config, or a third-party PLC without an ABB-specific interface unit. Compare: 16 points in S800 would be AO810V2/DI810/DO810 slices + TU830 + CI840 + Profibus/ModuleBus cabling — easily 3× the cost of one 1SFB536068D1013​ on a DIN clip with two wires for 24 V and two for A/B. For small satellite panels (pump Skid #7, filter-backwash station, MCC local annunciator), the ROI case is obvious, and that’s exactly the use-case ABB priced this for.Dual identity: DCS-extender AND PST/PSTB driver.​ Few spares in this catalog so far wear two hats. The ABB 1SFB536068D1013​ is the 8DI/8DO block on a PST105 or PSTB105 soft-starter’s control-logic side — reading the panel pushbuttons, EOL/OL aux, external-trip contacts (DI), and driving the internal relay, bypass contactor coil, fault LED, alarm horn (DO). For MRO planners on plants that run ABB PST soft-starters on conveyor belts, crusher auxiliaries, pump mains, and compressor loads, the 1SFB536068D1013​ belongs on the shelf alongside PST SCR/thyristor spares — but it’s also the same SKU that serves the DCS-retrofit panel three aisles over. One P/N, two storeroom “customers.”–25 °C cold-start and +70 °C hot.​ The S800/AO810V2 class rates 0–55 °C; the 1SFB536068D1013​ pushes to –25 / +70, which matters for unheated MCC rooms in northern plants, outdoor soft-starter kiosks (PST/PSTB often live next to the motor, not in the control room), and roof-mounted AHU panels. The wider envelope is a deliberate LV-division tuning — soft-starters see harsher envelopes than DCS racks do.8 ms input delay, 0.5 A DO, short-circuit protected.​ The DI side is opto-isolated, 24 V DC, sink/source jumperable per the wiring — standard IEC 61131-2 Type 1, so panel pushbuttons, selector switches, MCC dry contacts all land directly. The DO side is transistor (not relay), 0.5 A per point, grouped supply, short-circuit protected — enough for a panel relay coil, a bypass contactor coil, a small alarm horn, a fault beacon. 8 ms input delay is fine for pushbutton/EOL logic; if you need sub-ms, this isn’t your module (that’s S800 DI810 territory). The ABB 1SFB536068D1013​ is honest about its lane.LED per channel + run/fault.​ Front-face LEDs let a tech confirm “did the DI see the pushbutton? did the DO fire?” without a laptop or a clamp meter. In a PST soft-starter cubicle where the “start” pushbutton seems dead, the 1SFB536068D1013​ DI LED tells you in three seconds whether the fault is the button (LED off when pressed = wiring/button) or the module (LED on but DO doesn’t fire = DO stage or load). That diagnostic path is why the module beats a generic 24 V brick in soft-starter cabinets.Honest limitations.​ The ABB 1SFB536068D1013​ is 8DI+8DO only — no analog, no HART, no profibus/ModuleBus/hot-swap. If your retrofit needs 4–20 mA or 16 DI, step to S800 (AO810V2/AI810/DI810 from earlier in this catalog). If your PST soft-starter BOM calls a different 1SFB number for the driver (PSTB 105 vs PST 105 vs larger 142 A / 175 A / 250 A frames use different driver P/Ns), stop and cross the PST nameplate — the 1SFB536068D1013 aligns with the 105 A class per available docs; bigger PST frames may need a different 1SFB P/N.