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8.1.10 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.
Processing order
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 7 to the input of
Logic block 2.
8.1.11 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
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Siemens
Switching and monitoring device RMS705B
CE1P3124en
Building Technologies
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01.04.2010