Sensor Expansion Module; Versions; Communication; Connection Systems - Siemens 3RS2 Manual

Sensor expansion module

7.1

Versions

The sensor expansion module is an optional module for expanding the input and output
capacity of the system.
It provides two additional temperature inputs for resistance sensors, one relay output for output
of the sensor status and an additional 4 mA ... 20 mA current input.
Note
If the current input 4 ... 20 mA is selected, the other inputs are inactive.
The power supply for the external temperature sensor with current output 4 ... 20 mA must be
provided externally.
A maximum of two resistance sensors can be connected to the sensor expansion module. In
connection with the digital device, up to three resistance sensors can then be connected.
The sensor expansion module is positioned directly to the right of the digital device. See Chapter
Mounting position, installation width/overall depth, layout (Page 87).
7.2

Communication

The communication between the sensor expansion module and the digital basic unit is wireless
by means of an infrared interface integrated in both devices.
7.3

Connection systems

The devices can be supplied with the connection systems detailed below:
• Screw terminals
• Spring-type terminals (push-in)
7.4

Sensor types

Resistance sensors
• Pt100 (monitoring for overshoot/undershoot)
• Pt1000 (monitoring for overshoot/undershoot)
• KTY83‑110 (monitoring for overshoot/undershoot)
3RS2 temperature monitoring relay
Equipment Manual, 02/2022, A5E42462552002A/RS-AB/002
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