Product Introduction

Model Explanation

• 1SAP220500R3001: ABB part number.

• DC551‑CS31‑KBA (D2):

  • DC = Digital I/O Module

  • 551 = S500 series I/O model code

  • CS31 = CS31 fieldbus slave interface

  • KBA/D2 = Enhanced isolation/surge protection variant

• 220500: S500 platform code for CS31 bus I/O modules.

• R3001: Hardware revision (D2 variant, upgraded from R0001).

• Key difference from R0001: enhanced CS31 bus protection, same I/O count.

Technical Parameters

• Input: 8 × 24 VDC digital inputs (1‑wire)

• Configurable I/O: 16 × 24 VDC, 0.5 A per channel (DI or DO)

• Bus interface: CS31 slave (S500 backplane, expandable to 7 I/O modules)

• Power supply: 24 VDC (backplane), < 1 W consumption

• Protection: IP20; enhanced CS31 bus isolation/surge protection (KBA/D2)

• Operating temperature: 0 °C to +60 °C (extended range vs standard R0001)

• Storage temperature: −40 °C to +70 °C

• Humidity: 0–95 % non‑condensing

• Dimensions (W×H×D): 68 mm × 62 mm × 78 mm

• Weight: ~0.15 kg

• Mounting: DIN rail (TH35‑15)

• Certifications: CE, UL, CSA, RoHS

• Compatibility: AC500 V2/V3, AC500‑eCo, AC500‑S; S500 I/O system.

Interface and Communication

• Backplane: CS31 bus connector (enhanced isolation) for AC500/S500 I/O bus

• Field wiring: Screw terminals for 24 VDC sensors/actuators

• Fieldbus: CS31 protocol (slave) with surge protection for noisy environments

• Expansion: Up to 7 additional S500 I/O modules via backplane

• Hot swap: Yes

• LED indicators: Power, CS31 bus status, input/output channel status.

Core Functions

• Digital I/O: 8‑channel 24 VDC input for sensors; 16‑channel configurable 0.5 A output for relays/valves

• CS31 communication: Connects AC500 to CS31 networks with enhanced noise immunity

• Signal protection: Isolation + surge protection for CS31 bus and field signals

• Distributed control: Extends AC500 I/O remotely via CS31 bus

• Harsh environment readiness: KBA/D2 variant for high‑electrical‑noise areas.

Application Scenarios

• ABB AC500 systems needing CS31 bus + 8DI/16DC I/O + enhanced bus protection

• Factory automation: Conveyors, packaging machines in noisy environments

• Process automation: Pump/valve control in high‑EMI areas

• Machine building: CNC/robotic cells with electrical interference

• Retrofit: Upgrading legacy CS31 systems with improved durability.

Usage and Maintenance

• Mount on DIN rail; ensure airflow, avoid dust/condensation

• Connect 24 VDC backplane power with correct polarity

• Plug module into S500 backplane; secure lock

• Wire field devices to screw terminals (0.6 Nm torque)

• Configure CS31 communication via AC500 software

• Check LEDs: PWR (on), BUS (green = ok), IN/OUT (per channel)

• Periodically tighten terminals, clean dust, inspect corrosion

• Troubleshoot: Verify power, bus connection, LEDs first; replace if faulty.