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ABB ci521-modtcp:s500, bus-module 4ai/2ao/8di/8do
ABB CI521-MODTCP is a Modbus TCP communication interface and decentralised I/O module with four analogue inputs, two analogue outputs, eight 24 V DC digital inputs and eight 24 V DC transistor outputs for distributed industrial automation systems.
£432.65
Why Choose the ABB CI521-MODTCP Modbus TCP Interface Module?
The ABB CI521-MODTCP is a versatile Modbus TCP communication interface and decentralised I/O module designed for ABB AC500 and S500 industrial automation systems. It combines Ethernet-based Modbus TCP communication with integrated analogue and digital I/O, providing a compact solution for connecting field sensors and actuators to distributed industrial control networks.
The CI521-MODTCP provides 22 integrated I/O channels, comprising four configurable analogue inputs, two configurable analogue outputs, eight 24 V DC digital inputs and eight 24 V DC transistor outputs. Its analogue channels support commonly used industrial voltage, current and RTD signals, allowing process instrumentation and temperature sensors to be integrated alongside conventional digital devices.
Network connectivity is provided through two RJ45 Ethernet interfaces on a compatible terminal unit, with integrated switch functionality enabling straightforward Modbus TCP daisy-chain installations. Powered from a 24 V DC process supply, the CI521-MODTCP also supports additional ABB S500 I/O modules through its I/O bus, making it suitable for scalable remote I/O architectures.
Key Advantages
- Combined Modbus TCP communication interface and decentralised I/O module.
- 22 integrated analogue and digital I/O channels reduce the requirement for separate modules.
- Four configurable analogue inputs support voltage, current and RTD measurement.
- Two configurable analogue outputs support industrial voltage and current signals.
- Eight 24 V DC digital inputs for industrial sensors and switching devices.
- Eight 24 V DC transistor outputs rated up to 0.5 A per channel.
- Dual RJ45 Ethernet connections with integrated switch functionality simplify network installation.
- Integrated fast counter functionality supports high-speed signal applications.
Key Features
- ABB AC500 / S500 Modbus TCP communication interface module.
- Modbus TCP communication over industrial Ethernet.
- 4 configurable analogue inputs.
- 2 configurable analogue outputs.
- 8 digital inputs at 24 V DC.
- 8 digital transistor outputs at 24 V DC, maximum 0.5 A per channel.
- 12-bit analogue resolution including sign.
- Analogue inputs support voltage, current and RTD measurement functions.
- Analogue outputs support -10 to +10 V, 0–20 mA and 4–20 mA signals.
- Integrated fast counter functionality.
- Two rotary switches allow configuration of the last byte of the IP address.
- Two RJ45 Ethernet interfaces with integrated switch functionality.
- Ethernet interface is galvanically isolated from the rest of the module.
- Compatible with TU507-ETH and TU508-ETH terminal units.
Flexible Modbus TCP Distributed I/O for Industrial Automation
The ABB CI521-MODTCP provides a direct interface between industrial field devices and Ethernet-based Modbus TCP control networks. Combining analogue and digital I/O with the network interface reduces the number of individual modules required for many remote I/O stations while providing connectivity for transmitters, temperature sensors, switches, valves, relays and other industrial equipment.
Its integrated Ethernet switch supports convenient line and daisy-chain network configurations, while configurable analogue channels allow the module to accommodate a variety of process signals. Fast counter functionality and support for additional S500 expansion modules further increase its flexibility for machine automation, process control and high-availability remote I/O architectures.
Typical Applications
- Modbus TCP distributed and remote I/O systems.
- Industrial machinery and factory automation.
- Process measurement and control systems.
- Temperature and process sensor monitoring.
- Conveyor and material handling systems.
- Packaging and production machinery.
- High-availability industrial control architectures.
- ABB AC500 and S500 automation systems.
Technical Specifications
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| IP Rating | IP20 | |
|---|---|---|
| Coil / Supply Voltage | 20.4–28.8 V DC | |
| Digital Inputs | 8 | |
| Product Series | ABB AC500 | |
| Device Type | Communication / Function Module | |
| Digital Outputs | 8 | |
| Analogue I/O | 4 AI / 2 AO | |
| Output Type | Transistor | |
| Communication | Modbus TCP | |
| Supported Protocols | Modbus TCP | |
| Signal Type / Function | Analogue, Digital | |
| Number of I/O | 22 | |
| Manufacturer | ABB | |
| Series | AC500 / S500 | |
| Model | CI521-MODTCP | |
| Order code | 1SAP222100R0001 | |
| Product type | Modbus TCP communication interface / decentralised I/O module | |
| Communication protocol | Modbus TCP | |
| Network interface | Ethernet | |
| Ethernet connections | 2 × RJ45 via terminal unit | |
| Total integrated I/O channels | 22 | |
| Analogue inputs | 4 configurable channels | |
| Analogue input functions | Voltage, current and RTD measurement | |
| Analogue outputs | 2 configurable channels | |
| Analogue output voltage range | -10 to +10 V | |
| Analogue output current ranges | 0–20 mA, 4–20 mA | |
| Analogue resolution | 12 bits including sign | |
| Digital inputs | 8 × 24 V DC | |
| Digital input delay | Configurable from 0.1–32 ms | |
| Digital outputs | 8 × 24 V DC transistor outputs | |
| Maximum digital output current | 0.5 A per channel | |
| Process supply voltage | 24 V DC | |
| Module current consumption | approx. 0.260 A plus connected loads | |
| Potential isolation | Module-wise galvanic isolation | |
| Ethernet isolation | Ethernet interface galvanically isolated from the rest of the module | |
| Additional functionality | Fast counter | |
| IP address configuration | Rotary switches for last byte, 00h to FFh | |
| Terminal unit compatibility | TU507-ETH or TU508-ETH | |
| I/O expansion | Up to 10 additional S500 I/O modules | |
| Dimensions (H × W × D) | approx. 135 × 67.5 × 76 mm | |
| Mounting type | DIN rail via terminal unit | |
| HS Code | 85389091 | |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB CI521-MODTCP used for?
The ABB CI521-MODTCP is used as a Modbus TCP communication interface and decentralised I/O module, connecting analogue and digital field devices to Ethernet-based industrial automation networks.
How many I/O channels does the CI521-MODTCP have?
The CI521-MODTCP provides 22 integrated I/O channels, comprising four analogue inputs, two analogue outputs, eight digital inputs and eight digital outputs.
What analogue signals does the CI521-MODTCP support?
The module provides configurable analogue inputs for voltage, current and RTD measurement, while its two analogue outputs support industrial voltage and current signals including -10 to +10 V, 0–20 mA and 4–20 mA.
What is the output rating of the ABB CI521-MODTCP?
The CI521-MODTCP provides eight 24 V DC transistor outputs rated up to 0.5 A per channel for controlling industrial actuators and other field devices.
Can the ABB CI521-MODTCP be expanded with additional I/O modules?
Yes. The CI521-MODTCP supports connection of up to 10 additional ABB S500 I/O modules through its integrated I/O bus, allowing a remote I/O station to be expanded for larger automation systems.
Trusted ABB Modbus TCP Automation
ABB AC500 and S500 automation components provide modular industrial control and distributed I/O functionality, with the CI521-MODTCP combining Modbus TCP communication, flexible analogue and digital I/O and modular expansion for efficient machine and process automation.
