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ABB dc551-cs31:s500,bus module 8di/16dc
ABB DC551-CS31 is a CS31 slave communication interface and decentralised digital I/O module with eight 24 V DC digital inputs, 16 configurable 24 V DC digital I/O channels, 0.5 A transistor output capability and local S500 expansion for industrial automation.
£199.75
Why Choose the ABB DC551-CS31 CS31 Digital I/O Interface Module?
The ABB DC551-CS31 is a CS31 communication interface and decentralised digital I/O module designed for ABB AC500 automation systems. Operating as a CS31 slave, it connects distributed digital field signals to an ABB CS31 network while providing local expansion capability through the S500 I/O bus.
The DC551-CS31 provides 24 integrated digital I/O channels, comprising eight dedicated 24 V DC digital inputs and 16 configurable 24 V DC digital input/output channels. Each configurable channel can operate as an input, as a protected transistor output rated at 0.5 A, or as a re-readable combined input/output, giving system designers considerable flexibility when connecting sensors and actuators.
Communication with the CS31 fieldbus is provided through an RS-485 serial interface, while two rotary switches allow the module address to be set from 00 to 99. Module-wise galvanic isolation, integrated fast counter functionality, status LEDs and support for additional S500 I/O modules make the DC551-CS31 a practical interface for distributed machine and process automation.
Key Advantages
- Combines CS31 slave communication and decentralised digital I/O in one module.
- 24 integrated digital I/O channels reduce the requirement for separate expansion modules.
- 8 dedicated 24 V DC digital inputs for sensors and switching devices.
- 16 configurable 24 V DC digital input/output channels provide flexible signal allocation.
- Configurable transistor outputs are rated at 0.5 A per channel and include short-circuit and overload protection.
- Integrated fast counter functionality supports pulse and counting applications.
- Module-wise galvanic isolation separates the field I/O from the module's other electronic circuitry.
- Local S500 I/O expansion supports larger decentralised automation stations.
Key Features
- ABB AC500 / S500 CS31 communication interface module.
- Operates as a CS31 slave decentralised I/O device.
- RS-485 serial fieldbus interface.
- 8 digital inputs at 24 V DC.
- 16 configurable digital inputs/outputs at 24 V DC.
- Configurable channels support input, transistor output or re-readable combined input/output operation.
- 0.5 A rated current per configurable transistor output.
- Short-circuit and overload protection for configurable transistor outputs.
- Integrated fast counter functionality.
- Two rotary switches for setting the module address from 00–99.
- Module-wise galvanic isolation.
- Eight yellow LEDs indicate dedicated digital input states.
- Sixteen yellow LEDs indicate configurable digital I/O states.
- Dedicated LEDs provide process voltage, communication and diagnostic status indication.
- Expandable with additional ABB S500 I/O modules.
Flexible CS31 Distributed Digital I/O for Industrial Automation
The ABB DC551-CS31 provides a bridge between an ABB CS31 fieldbus and local 24 V DC digital field devices. The CS31 connection uses an RS-485 serial interface, allowing the module to operate as a decentralised I/O station while its eight dedicated inputs and 16 configurable channels connect switches, proximity sensors, relays, valves and other industrial equipment.
The configurable channels provide additional flexibility because each can operate as an input, protected transistor output or re-readable output. The DC551-CS31 can also be extended with up to seven S500 I/O modules, allowing analogue, digital and specialised I/O functions to be added when a decentralised station requires more capability than the module's integrated channels provide.
Typical Applications
- ABB CS31 distributed and decentralised I/O systems.
- Industrial machine automation.
- Factory and production control systems.
- Digital sensor and actuator interfacing.
- Conveyor and material handling systems.
- Packaging and processing machinery.
- Fast pulse counting applications.
- Proximity sensor and limit switch monitoring.
- Solenoid valve, relay and contactor control.
- Expansion and modernisation of existing ABB CS31 installations.
Technical Specifications
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| IP Rating | IP20 | |
|---|---|---|
| Device Type | Digital I/O Module | |
| Coil / Supply Voltage | 20.4–28.8 V DC | |
| Communication | CS31 | |
| Supported Protocols | CS31 | |
| Signal Type / Function | Digital | |
| Number of I/O | 8 | |
| Product Series | ABB AC500 | |
| Manufacturer | ABB | |
| Series | AC500 / S500 | |
| Model | DC551-CS31 | |
| Order code | 1SAP220500R0001 | |
| Product type | CS31 communication interface / decentralised digital I/O module | |
| Communication protocol | ABB CS31 | |
| Network role | CS31 slave | |
| Physical fieldbus interface | RS-485 | |
| Integrated I/O channels | 24 | |
| Dedicated digital inputs | 8 × 24 V DC | |
| Configurable digital I/O | 16 × 24 V DC | |
| Configurable channel functions | Digital input, transistor output or re-readable combined input/output | |
| Rated transistor output current | 0.5 A per channel | |
| Output protection | Short-circuit and overload protection | |
| Fast counter | Integrated | |
| Module address | 00–99 via 2 rotary switches | |
| Potential isolation | Module-wise galvanic isolation | |
| Dedicated input indication | 8 yellow LEDs | |
| Configurable I/O indication | 16 yellow LEDs | |
| Process voltage indication | 1 green LED | |
| Error indication | 3 red LEDs | |
| System indication | PWR, CS31, S-ERR and I/O-Bus LEDs | |
| Local expansion | Up to 7 additional S500 I/O modules | |
| Terminal units | TU551 or TU552 | |
| Mounting type | DIN rail via terminal unit | |
| HS Code | 85389091 | |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB DC551-CS31 used for?
The ABB DC551-CS31 is used as a CS31 slave communication interface and decentralised digital I/O module, connecting 24 V DC sensors and actuators to ABB CS31 industrial automation networks.
How many I/O channels does the DC551-CS31 provide?
The DC551-CS31 provides 24 integrated digital I/O channels, consisting of eight dedicated 24 V DC digital inputs and 16 configurable 24 V DC digital input/output channels.
What can the configurable channels on the DC551-CS31 do?
Each of the 16 configurable channels can operate as a digital input, a protected transistor output rated at 0.5 A, or a re-readable combined input/output, allowing the module to be adapted to different combinations of sensors and actuators.
Can the ABB DC551-CS31 be expanded with additional I/O modules?
Yes. The DC551-CS31 can be extended with up to seven additional ABB S500 I/O modules, allowing larger decentralised CS31 stations to incorporate additional digital, analogue or specialised I/O functions.
How is the CS31 address set on the DC551-CS31?
The module has two rotary switches for setting its address from 00 to 99, providing straightforward hardware configuration of the decentralised CS31 station.
Trusted ABB CS31 Distributed I/O
ABB AC500 and S500 automation components provide modular distributed control for industrial applications, with the DC551-CS31 combining CS31 slave communication, 24 integrated digital I/O channels, protected transistor outputs, fast counter functionality and local S500 expansion in a flexible decentralised I/O interface.
