Chapter 9
126
Logic programming – Function blocks
9.5.4 Fault present output
Various function blocks dispose of the Fault present diagnostics output. In order to use it,
activate the Use fault present checkbox on the I/O settings tab of the function block
properties. The additional output “Fault present” is now displayed in the function block.
The Fault present output changes to High when an error has been detected on the
basis of the configured function block parameters (e.g. discrepancy time error, function
test error, synchronization error, etc.). When the Fault present output is High, the main
output (e.g. the Enable output) changes to Low.
The Fault present output is set to Low if all errors are reset. The conditions to reset an
error are described in the section of the respective function block.
Figure 97:
Activating the Fault present
output
Figure 98:
Fault present output
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