10.3 Using the digital device to implement a simple 3-step controller
with simultaneous output of an alarm value
Example of wiring: Simple three-step control (heating/cooling)
The digital device can also be used to implement a simple three-step control with simultaneous
output of an alarm value.
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Figure 10-3 Three-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. If the
set temperature is exceeded, the cooling is connected.
Circuit diagrams
10.3 Using the digital device to implement a simple 3-step controller with simultaneous output of an alarm value
3RS2 temperature monitoring relay
Equipment Manual, 02/2022, A5E42462552002A/RS-AB/002 73
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