Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 14 Function block faults 2017-09-29
14.8.2 Analog fault input with limit value supervision
An analog input can be monitored for limit value crossings.
An input that is already configured can also be monitored. For example, the main flow
temperature sensor can also be monitored to ensure that a maximum flow temperature
will not be exceeded.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Faults > Fault input 1 (or 2, 3 or 4)
Operating line
Range
Factory setting
Limit value fault on
0 / 1*
1
Limit value fault off
0 / 1*
0
* Depending on the input identifier; the example given here applies to a digital input
If Limit value fault on is greater than Limit value fault off, the input is monitored for
overshoot.
Limit value fault on: 80 °C
Limit value fault off: 75 °C
If the temperature exceeds 80 °C, a fault is identified; if it drops again to a level below
75 °C, the fault is considered rectified.
ERROR
ON
OFF
3132D12
If Limit value fault off is greater than Limit value fault on, the input is monitored for
undershoot.
Limit value fault on: 10 °C
Limit value fault off: 12 °C
If the temperature falls below 10 °C, a fault is identified; if it returns to a level above
12 °C, the fault is considered rectified.
ERROR
ON
OFF
3132D13
Example 1
Example 2