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6.2.22 Assigning the digital inputs of the I/O module
The digital inputs PLC-IN 1 ... The available functions can be assigned in any way
necessary to the 10 I/O module.
– Active signal: typically 24 V
– Inactive signal: typically 0 V.
The 24V output of the I/O module can be used as an active signal.
Every function can be inverted.
Possible functions: see the following table
Control unit Settings > Set up > Interfaces > I/O module > Digital inputs >
Configuration PLC Input
LD protocol Command 438
ASCII protocol *CONFig:PLCINLINK:1 (2 ... 10)
Key-operated switch
An external key switch with up to three switching outputs can be connected via three
PLC inputs. The key switch can be used to select the access level of the operator of
the control unit.
Button 1 - Operator
Button 2 - Supervisor
Button 3 - Integrator
Example for a suitable key switch: Hopt+Schuler, No. 444-05
Functions, assignment of digital inputs:
Function Flank/state: Description
No function – No function
CAL dynam. inactive→
active:
active→
inactive:
Start external dynamic calibration.
Apply value for background and finish calibration.
CAL external inactive→
active:
active→
inactive:
Start external calibration.
Apply value for background and finish calibration.
SNIF/VAC inactive→
active:
Enable sniffer mode.
Start inactive→
active:
Switch to Meas. (ZERO is possible, all trigger outputs switch depending
on the leak rate.)
STOP inactive→
active:
Switch to Standby. (ZERO is not possible, all trigger outputs will return
"Leak rate threshold value exceeded".)
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