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The possible values of the parameter have the following meaning:
● True
With this setting, the trigger starts block processing only in the first cycle. The block is
processed only once.
● False
With this setting, the block is not processed.
● STATUS_ERROR
The block is only called on an edge change, this means if a diagnostics message of the
class "ERROR" or "FATAL" is generated.
Input parameter "Reset"
The input parameter resets a digital input and and resets the output of the block to zero or
the start value.
With the exception of the latching relay the input parameter "Reset" is optional.
The possible values of the parameter have the following meaning:
● True
With this setting the other inputs are ignored. The block is not processed.
● False
The block is processed in every cycle.
● STATUS_ERROR
The block is only called on an edge change, this means if a diagnostics message of the
class "ERROR" or "FATAL" is generated.
Output parameter "Error"
The output parameter "Error" is set in the following situations:
● In an analog value block, the value is outside the range of values.
This occurs when the value calculated by the block is outside the permitted range of
values of the tag type of the output.
● A message generated by a block cannot be saved because the maximum number of
messages to be saved has been reached (transfer buffer full).
When the output parameter "Error" is set, other output parameters are not updated but retain
the last values before the error occurred.
Recurring settings of parameters
With most program blocks there are default settings of the input and output parameters that
are explained here.
RTU3030C
Operating Instructions, 09/2017, C79000-G8976-C382-04
Programming
5.3 Often used parameters
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