Siemens 3RS2

10.2 Using the digital device to implement a simple 2-step controller
with simultaneous output of an alarm value
Example of wiring: Simple two-step control
The digital device can be used to implement a simple two-step controller with simultaneous
output of an alarm value.
$
9/Ù
$<
77
77
7
.
.

91Ù
5HPRWH
UHVHW
&
12
1&
&
12
1&
Figure 10-2 Two-step control (here with sensor expansion module)
Terminals:
• Supply voltage: A1, A2
• Manual reset: Push-button on Y1, A2 or on display
• Resistance sensors: T1, T2, T3
• Thermocouples: T+, T-
• Output/actuator: 14 N0, 11 C (change-over contact's NO contact)
• Signaling output: 12 NC, 11 C (change-over contact's NC contact)
Operating principle:
If the temperature set on the device is undershot, the output relay connects the heating.
Circuit diagrams
10.2 Using the digital device to implement a simple 2-step controller with simultaneous output of an alarm value
3RS2 temperature monitoring relay
72 Equipment Manual, 02/2022, A5E42462552002A/RS-AB/002