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292 SICAM RTUs, User Manual SICAM CMIC
DC8-001-2.09, Edition 08.2016
6.2.3 Behavior of the Process Outputs upon Startup and Failure
With failure of the supply voltage and during startup of the system all the process outputs are
terminated.
After startup of the master control element the periodical information items for the open-/closed-
loop control function are initialized with the value 0 and a status "faulty" dependent on the
I/O module.
After startup of the peripheral element all periodical information items from faultless inputs are
written with the current preprocessed value, and the corresponding status "faulty" is reset.
The behavior of outputs upon communication failure is dependent on the I/O module and can
be defined for each output selectively with the parameter Fail_behav.
Binary information outputs
The following behavior can be selected:
• terminate (default)
• keep
Current and voltage outputs
The following behavior can be selected:
• keep (default)
• substitute value
If the substitute value is selected, in the following cases the value defined via parameter
fail_subst_value is output:
Event Description Action
Power-on Return of the supply volt-
age after failure
As long as no setpoint value was received,
the parameterized substitution value is calcu-
lated and transferred as active value into the
process image
Startup Startup possible via
• Remote command
• Operation
With a remote startup the value is reset to the
last value, independent of the parameteriza-
tion; if a value never was received, the substi-
tution value is output
Communication failure
master control unit
Substitution value is output
Failure master control
unit
Substitution value is output
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