ABB AC500 PLC - 1.7.4.1.1 Intended Purpose; 1.7.4.1.2 Functionality; 1.7.4.1.3 Electrical Connection

1.7.4.1.1 Intended Purpose
The Modbus TCP bus module CI521-MODTCP is used as decentralized I/O module in Modbus
TCP networks. The network connection is performed via 2 RJ45 connectors which are inte-
grated in the terminal unit. The bus module contains 22 I/O channels with the following proper-
ties:
● 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 electrically isolated from the Ethernet network. There is no potential sep-
aration 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 spe-
cial 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 expansion 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 VDC; delay time configurable via soft-
ware)
Digital outputs 8 (24 VDC, 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 VDC)
Required terminal unit
TU507 or TU508 Ä Chapter 1.4.1 “TU507-ETH
and TU508-ETH for Ethernet Communication
Interface Modules” on page 145
1.7.4.1.3 Electrical Connection
The Ethernet bus module CI521-MODTCP is plugged on the I/O terminal unit TU507-ETH or
TU508-ETH Ä Chapter 1.4.1 “TU507-ETH and TU508-ETH for Ethernet Communication Inter-
face Modules” on page 145. Properly seat the module and press until it locks in place. The ter-
minal unit is mounted on a DIN rail or with 2 screws plus the additional accessory for wall
mounting (TA526
Ä Chapter 1.8.2.4 “TA526 - Wall Mounting Accessory” on page 1152).
The electrical connection of the I/O channels is carried out using the 30 terminals of the I/O ter-
minal unit. I/O modules can be replaced without re-wiring the terminal units.
Device Specifications
Communication Interface Modules (S500) > Modbus
2019/04/17 3ADR010121, 13, en_US 879