Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 11 Logic functions 2017-09-29
11.2 Comparator
The Comparator helps compare two analog input signals.
Two Comparators are available:
If differential value (A - B) between input A and B:
– Is greater than "Limit value on", the Comparator turns on
– Is smaller than "Limit value off", the Comparator turns off
A should (normally) be greater than B, as the difference (A – B) is evaluated with
preceding sign, and the limit values cannot be set negative.
Min. switch-on and switch-off times can be set for the output signal of the Comparator
along with a switch-on and switch-off delay.
These adjustable times are always active (except during wiring tests).
11.2.1 Activate Comparator
Assign an input to activate the Comparator.
Main menu > Commissioning > Extra configuration > Comparator > Comparator 1...2
Operating line
Adjustable values / Comment
Factory setting
Switching value A
---, X1, X2, ...
Switching value B
---, X1, X2, ...
Comparator relay
---, N.Q1, N.Q2, ... (free outputs only)
Time format
h:m, m:s
m:s
• You can select format "Hours:Minutes" as an extended time format (> 59.59 m.s) for
the Comparator
Important: The changeover impacts all time-related parameters of the Comparator
(switch-on/off delay and min. switch-on/off time)
• Time format "h:m" offers a 10-minute increment setting range
• The units of the inputs switching value A and B must be the same type, e.g. both °C
or both %, see error handling
• The unit of the input terminal is automatically assigned
Purpose
Function principle
Note
Configuration
Notes