DC551-CS31 1SAP220500R0001 ABB Distributed I/O module Compact ·High reliability

Product Overview

ABB DC551-CS31 (Model: 1SAP220500R0001) is a distributed I/O master module specially designed for ABB AC 500 series programmable logic controller (PLC) systems and is a core component of the CS31 bus system. This module connects remote I/O slave stations (such as DC541, DC552, etc.) via the CS31 communication bus, achieving long-distance and highly reliable signal acquisition and control. The maximum communication distance can reach 1200 meters, and the number of nodes supported is up to 31 slave stations.

The DC551-CS31 is widely used in mechanical manufacturing, water treatment, building automation, material handling, and small and medium-sized process control systems. It is particularly suitable for application scenarios where I/O points need to be distributed and the complexity of the main control cabinet wiring needs to be reduced.

Core features

CS31 bus master interface: Serves as a communication bridge between the AC 500 CPU and remote I/O
High-speed communication: Baud rate up to 187.5 kbps, short cycle time, and rapid response
Long-distance support: The maximum bus length is 1200 meters (using standard shielded twisted-pair cables)
Multi-slave connection: Supports up to 31 CS31 remote I/O slaves
LED status indication: Clearly display the power (PWR), operation (RUN), communication (COM) and fault (ERR) status
Plug and play installation: Insert directly into the AC 500 expansion rack, and the configuration will be automatically recognized
Robust industrial design: Strong resistance to electromagnetic interference (EMC), suitable for harsh industrial environments
Hot-swapping support (system permission required) : Facilitates maintenance without interrupting the entire system

Technical parameters
Model: 1SAP220500R0001
Product Name: DC551-CS31 CS31 Bus Master Module
System to which: ABB AC 500 series PLC/CS31 distributed I/O system
Function type: Communication master Station Interface module (Non-I /O signal module)
Communication protocol: CS31 (ABB proprietary Fieldbus)
Maximum baud rate: 187.5 kbps
Maximum number of slave stations: 31
Maximum bus length: 1200 meters (using ABB recommended cables, such as CYLYCY 2×2× 0.8mm ²)
Minimum distance between nodes: 1 meter
Power supply mode: Powered by the AC 500 backplane bus
Status indication
PWR (Green) : Normal power supply
RUN (green) : The module is running normally
COM (yellow) : Bus communication activity
ERR (red) : Communication error or configuration failure

Typical applications

Distribute I/O points to sites far from the main control room (such as pumping stations, along conveyor belts)
Reduce the large amount of hardwiring from the main control cabinet to the site, lowering the project cost and failure rate
Build modular and scalable small and medium-sized automation systems
It works in conjunction with AC 500 cpus (such as PM564 and PM590) to achieve a flexible control architecture

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