Description:
The ABB 1SBP260056R1001, also identified as the ICMK-CS31 Remote Unit, is a bus-coupling / remote I/O head module for ABB’s Advant Controller 31 (AC31) series and compatible CS31 network architectures. It serves as the intelligent interface between a CS31 master (AC31 CPU) and locally mounted S500-series I/O modules (digital input/output, analog input/output, etc.), enabling distributed signal acquisition and control up to 500 m from the main control cabinet without running individual field cables back to the PLC.
Application Scenarios:
A bottling plant’s main filling line was being extended by 40 meters to add a new accumulation conveyor and a reject station. Running dozens of individual 24 V DC sensor and solenoid cables back to the central AC31 PLC panel would have meant expensive conduit work, long lead times, and increased EMI risk. Instead, the integrator installed an ABB 1SBP260056R1001 (ICMK-CS31) remote unit in a small local junction box at the line extension, clipped two S500 I/O slices (one 16DI + one 16DO) onto its right-hand expansion bus, set the rotary address switch to Node 5, and ran a single shielded twisted-pair CS31 cable (~60 m) back to the AC31 master rack. Within one afternoon the new conveyor sensors and reject pusher solenoids were online — configured directly from the existing PLC program with no new CPU or rack required. The ICMK-CS31 turned what would have been a cabling nightmare into a clean, cost-effective distributed I/O solution, eliminating hundreds of meters of copper and significantly reducing commissioning time.
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1SBP260056R1001 (ICMK-CS31) |
| Manufacturer | ABB |
| Product Category | Advant Controller 31 – Remote Unit / CS31 Bus Coupler (I/O Head Module) |
| Compatible System | ABB Advant Controller 31 (AC31-40 / AC31-50), CS31 Network |
| Supply Voltage | 24 V DC (19.2 – 30 V DC allowable range) |
| Power Consumption | < 2.5 W (excluding connected I/O modules) |
| Communication Bus | CS31 (RS-485 physical layer, ABB proprietary master-slave protocol) |
| Bus Data Rate | 187.5 kbit/s |
| Max. Bus Length | 500 m (unrepeated), extendable with repeaters |
| Max. Slaves per Master | 31 CS31 nodes |
| Local I/O Expansion | Up to 6 or 7 S500-series I/O modules (digital / analog / special) on right-side bus |
| Node Addressing | Rotary DIP switch (0 – 31) on front panel |
| Status Indication | PWR (power), RUN (active on CS31), ERR (fault/bus error) LEDs |
| Operating Temperature | -25 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Mounting Method | 35 mm DIN rail (EN 60715), screw-terminal wiring |
| Protection Class | IP20 (for installation inside enclosed cabinet / local box) |
| Dimensions (approx.) | 90 × 140 × 70 mm (W × H × D, including terminals) |
| Weight (approx.) | 0.30 – 0.35 kg |
Technical Principles and Innovative Values:
- Innovation Point 1 — Transparent I/O Mapping over CS31. The ABB 1SBP260056R1001 automatically exchanges process-image data with the AC31 master every scan cycle. All locally connected S500 I/O points appear in the master PLC’s I/O image table as if they were in the main rack — no messaging instructions or custom protocol coding required, simplifying engineering and reducing scan-time overhead.
- Innovation Point 2 — Modular S500 I/O Expansion Without a CPU. The ICMK-CS31 itself contains no user program; it acts purely as a bus-activated I/O aggregator. Up to 6–7 S500 modules can be snapped onto its right-side expansion bus, mixing DI, DO, AI, AO, and temperature-input slices as needed — making it exceptionally flexible for varied field signal mixes.
- Innovation Point 3 — Front-Panel Diagnostics & Address Security. A three-LED status cluster (PWR / RUN / ERR) gives immediate go/no-go indication of power, bus communication, and fault conditions. The recessed rotary address switch prevents accidental mis-addressing during maintenance, and a watchdog timer automatically forces outputs to safe state if CS31 communication is lost — a critical safeguard in distributed machine control.
Application Cases and Industry Value:
Case – Automotive Parts Washer Distributed I/O Upgrade: A tier-1 automotive supplier operated a multi-stage parts washer with pump skids located 80 m from the main AC31 control panel. Originally wired with parallel multicore cables, repeated flexing and wash-down exposure caused intermittent opens that were difficult to trace. During a planned downtime window the plant installed two ABB 1SBP260056R1001 (ICMK-CS31) remote units — one at each pump skid — each with local S500 DI (float-switch & pressure-switch monitoring) and DO (pump start/stop, solenoid valves) modules. A single CS31 cable linked both remote stations back to the master rack. Post-conversion, all pump status signals updated in <20 ms, wiring fault calls dropped to zero, and the plant documented a 70 % reduction in troubleshooting time for washer I/O issues. The ICMK-CS31 delivered a robust, noise-immune distributed I/O architecture that extended the life and reliability of the legacy AC31-based control system.
