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3 Operation and visualisation
3.2 Open-collector outputs
The printing recorder is equipped with four open-collector outputs. The out-
puts 1 to 3 have a fixed assignment to the limit comparators 1 to 3. Output 4 is
used as a fault signal output. The outputs can be activated by using the pa-
rameter Configuration level 2
Î Open-collector.
Fault output The fault signal output can be used to indicate a fault. During correct operation
of the printing recorder this output is active. In the event of a fault or distur-
bance, or if the status in the parameter Configuration level 2
Î Open-collector
is OFF, it becomes inactive (open).
The following causes will lead to a fault signal:
- Chart paper end
- Power off
- The battery of the recorder is discharged
- No communication with the external relay module ER8
- Fatal errors
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