ABB AC500 V3 - 1.7.4.1.1 Intended purpose; 1.7.4.1.2 Functionality; 1.7.4.1.3 Connections

1.7.4.1.1 Intended purpose
The Modbus TCP communication interface module CI521-MODTCP is used as decentralized
I/O module in Modbus TCP networks. The network connection is performed via 2 RJ45 connec-
tors which are integrated in the terminal unit. The communication interface module contains 22
I/O channels with the following properties:
● 4 analog inputs (1.0...1.3)
● 2 analog outputs (1.5...1.6)
● 8 digital inputs 24 V DC in 1 group (2.0...2.7)
● 8 digital outputs 24 V DC in 1 group (3.0...3.7)
The inputs/outputs are galvanically isolated from the Ethernet network. There is no potential
separation between the channels. The configuration of the analog inputs/outputs is performed
by software.
For usage in enhanced ambient conditions (e.g. wider temperature and humidity range), a
special XC version of the device is available.
1.7.4.1.2 Functionality
Parameter Value
Interface Ethernet
Protocol Modbus TCP
Power supply From the process supply voltage UP
Supply of the electronic circuitry of the I/O
expansion modules attached
Through the I/O bus interface (I/O bus)
Rotary switches for setting the last BYTE of the IP (00h to FFh)
Analog inputs 4 (configurable via software)
Analog outputs 2 (configurable via software)
Digital inputs 8 (24 V DC; delay time configurable via soft-
ware)
Digital outputs 8 (24 V DC, 0.5 A max.)
LED displays For system displays, signal states, errors and
power supply
External supply voltage Via terminals ZP, UP and UP3 (process supply
voltage 24 V DC)
Required terminal unit
TU507 or TU508 Ä Chapter 1.5.1 “TU507-ETH
and TU508-ETH for Ethernet communication
interface modules” on page 122
1.7.4.1.3 Connections
The Ethernet communication interface module CI521-MODTCP is plugged on the I/O terminal
unit TU507-ETH or TU508-ETH Ä Chapter 1.5.1 “TU507-ETH and TU508-ETH for Ethernet
communication interface modules” on page 122. Properly seat the module and press until it
locks in place. The terminal unit is mounted on a DIN rail or with 2 screws plus the additional
accessory for wall mounting (TA526
Ä Chapter 1.8.2.6 “TA526 - Wall mounting accessory”
on page 902).
The connection of the I/O channels is carried out using the 30 terminals of the I/O terminal unit.
I/O modules can be replaced without re-wiring the terminal units.
Device specifications
Communication interface modules (S500) > Modbus
2022/01/31 3ADR010278, 3, en_US 731