ABB AC500 PLC - 1.7.2.3.2 Functionality; 1.7.2.3.3 Electrical Connection

● as a transistor output with short circuit and overload protection, 0.5 A rated current or
● as a re-readable output (combined input/output) with the technical data of the digital inputs
and outputs.
The inputs and output are electrically isolated from the other electronic circuitry of the module.
For usage in extreme ambient conditions (e.g. wider temperature and humidity range), a special
XC version of the device is available.
1.7.2.3.2 Functionality
Interface RS-485, CS31 protocol
Supply of the module's electronic circuitry From UP and ZP (power supply)
Supply of the electronic circuitry of the I/O
modules attached
Through the bus interface (I/O bus)
Address switches For setting the CS31 field bus address (0 to
99)
Digital inputs 8 (24 VDC)
Digital inputs/outputs 16 (24 VDC)
Fast Counter Integrated, many configurable operating
modes
LED displays For system displays, signal statuses, errors
and power supply
External supply voltage Via the terminals ZP and UP (process voltage
24 VDC)
Effect of incorrect input terminal connection Wrong or no signal detected, no damage up to
35 V
Required terminal unit
TU551-CS31 or TU552-CS31 Ä Chapter
1.4.7 “TU551-CS31 and TU552-CS31 for
CS31 Communication Interface Modules”
on page 168
1.7.2.3.3 Electrical Connection
The CS31 bus module is plugged on the CS31 terminal unit TU551 or TU552
Ä Chapter 1.4.7
“TU551-CS31 and TU552-CS31 for CS31 Communication Interface Modules” on page 168.
Hereby, it clicks in with two mechanical locks. The terminal unit is mounted on a DIN rail or with
2 screws plus the additional accessory for wall mounting (TA526 Ä Chapter 1.8.2.4 “TA526 -
Wall Mounting Accessory” on page 1152).
The electrical connection of the I/O channels is carried out using the 40 terminals of the CS31
terminal unit. It is possible, to replace CS31 bus modules and I/O modules without loosening the
wiring.
The terminals 1.8 to 4.8 and 1.9 to 4.9 are electrically interconnected within the terminal unit
and always have the same assignment, irrespective of the inserted module:
● Terminals 1.8 to 4.8: process voltage UP = +24 VDC
● Terminals 1.9 to 4.9: process voltage ZP = 0 V
The assignment of the other terminals depends on the inserted CS31 bus module.
Device Specifications
Communication Interface Modules (S500) > CS31
2019/04/173ADR010121, 13, en_US812