ABB AC500-S Safety User Manual page 429

Information on the diagnostics concept
The representation of the diagnostics concept is for information only. For the safety functionality the dedi-
cated safety inputs and outputs shall be used.
Daisy chain from Activate and Ready
The connection of the Ready output to an Activate input of the following FB ensures that no irrelevant diag-
nostic information is generated if a device is disabled. The daisy chain from Activate and Ready avoid subse-
quent error messages of related function blocks.
Pre-evaluation of Hardware errors
If the target system supports an error signal, e.g., InputDevice_active, which represents the status (Active or
Not Active) of the relevant safety device, this signal can be used to disable the safety function blocks. This
ensures no irrelevant diagnostic information is generated if a device is disabled. If no such error signal is
provided by the target system, a static TRUE signal must be assigned to the Activate input.
Evaluation of the diagnostic information
The Error signals and DiagCodes of each safety function block are transferred to the standard application.
Diagnosis information might be processed and displayed by an attached visualization. There are different
possibilities to realize the evaluation of the diagnostic information:
n Transfer these values into the visualization and realize the diagnostic evaluation in the visualization.
n Realize the diagnostic evaluation in the standard logic and transfer the results to the visualization
Because of the various possibilities and the differences in the target system to realize diagnostic processing,
there is no special example showed here. Further diagnostic processing could be:
n Display of the error status for each safety function block
Providing an error overview which is linked to function block specific error displays
n
n Detection and display of the last error of the used safety function blocks in the safety application.
30.03.2017
Safety application examples
Example 1: Diagnostics concept > Additional notes
AC500-S 429