Logic; Function - Siemens RMB795B Basic Documentation

Purpose
Operation selector
Settable times
Converting an analog
signal to a digital signal
Internal structure
Siemens
Building Technologies
9

Logic

9.1

Function

C
The logic block is used to make logical links to multiple input signals.
10 independent logic function blocks are available.
One operation selector
to manually intervene at the upper main menu level.
Auto, Off and On can be selected. The intervention acts on the output of the logic
function block.
You can set a switch on and switch off delay as well as minimum switch on and off
period for the output signal on function area C.
These times always act (e.g. for an operation selector
during a wiring test.
Each input can be assigned a digital or analog signal.
Using switch-on and switch-off values, an analog signal can be converted to an
On/Off signal. Where:
Switching value on > switching value off: Transition from 0  1
Switching value on < switching value off: Transition from 1  0
A difference between switching value On and switching value Off represents the
hysteresis.
• Inputs 1, 2 and 3 are internally connected to logic A.
• Inputs 1 and 2 are connected to logic B.
• For logic A and logic B, logic functions AND, NAND, OR or NOR can be
selected.
• The results from logics A and B act on logic C.
• Logic functions AND, NAND, OR, NOR , EXOR or EXNOR can be selected in
logic C.
Logic Logic
Logic
Central control unit RMB795B
Logic
can be activated per logic function block to allow the use
intervention), except
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CE1P3122en
18.01.2012