9 1 green LED to display the process voltage UP
10 3 red LEDs to display errors
11 Label
12 Terminal unit
13 DIN rail
Sign for XC version
1.7.2.2.1 Intended Purpose
The CS31 Bus Module is used as a decentralized I/O module on CS31 field buses. The bus
connection is performed on a RS485 serial interface, which allows the connection of this module
to all existing CS31 buses. In addition, the CS31 Bus Module provides 22 I/O channels with the
following properties:
● 8 digital inputs, 24 VDC
● 8 configurable digital inputs/outputs 24 VDC, 0.5 A max.
● 4 analog inputs, voltage, current and RTD, resolution 12 bits plus sign
● 2 analog outputs, voltage and current, resolution 12 bits plus sign
The configuration is performed by software.
For usage in extreme ambient conditions (e.g. wider temperature and humidity range), a special
XC version of the device is available.
1.7.2.2.2 Functionality
Interface RS485, CS31 protocol
Address switches For setting the module's address (00d to 99d)
Digital inputs 8 (24 VDC; delay time configurable via soft-
ware)
Configurable digital inputs/outputs 8 (24 VDC, 0.5 A max.)
Analog inputs 4 (configurable via software), resolution 12
bits plus sign, voltage, current and RTD input
Analog outputs 2 (configurable via software), resolution 12
bits plus sign, voltage and current output
Fast Counter Integrated, many configurable operating
modes
LED displays For system displays, signal statuses, errors
and power supply
External supply voltage Via terminals UP and ZP (process supply
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
Communication Interface Modules (S500) > CS31
2019/04/17 3ADR010121, 13, en_US 779
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