Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 11 Logic functions 2017-09-29
11.1.10 Notes
• There is no hysteresis if with an analog input of the Logic block the switching value is
set to On = switching value Off.
• The "Off" state is issued for the entire Logic block if an error occurs at a configured
input.
• Logic C is ignored and the signal of Logic A is sent directly to the output if only inputs
are configured with Logic A.
• Logic C is ignored and the signal of Logic B is sent directly to the output if only inputs
are configured with Logic B.
• The Logic blocks are processed sequentially in accordance with their instance
number, i.e. first Logic 1, then Logic 2 to Logic 4.
• The result at Logic block 2 becomes available only upon the next handling cycle if
outputs are looped back, e.g. from the output of Logic block 4 to the input of Logic
block 2.
11.1.11 Application example for storage tank charging
The following application example shows a solution for a self-holding function:
• The measured value connected to Logic A input 1 issues the switch-on command
for storage tank charging.
• The measured value at Logic B input 1 terminates charging.
Required configuration and setting values:
Operating line Comment
[Logic A] function
OR
[Logic B] function NAND
[Logic C] function
AND
[Logic A switching value 1] on
30 °C
[Logic A switching value 1] off
35 °C
[Logic B switching value 1] on
65 °C
[Logic B switching value 1] off
60 °C
Processing order