Device functions
Version 1
RES-5007
Page 29
Through the analogue input of a PLC – and a corresponding evaluation – a selective error detection and error dis-
play can be implemented simply and at low cost (
section 8.16 "Error messages" on page 29).
An error message can be reset by applying the RESET signal or switching the controller off and on.
Resetting the error message using the RESET signal becomes effective only when the RESET signal is switched
off.
Invalid error messages can occur when the controller is switched off due to the undefined operating status. This
must be considered in evaluating the higher-level controller (e.g. PLC) to avoid false alarms.
8.16
Error messages
The following table shows the assignment of the output analogue voltage values at the actual value output to the
errors that occur. In addition, the cause of the errors and the necessary measures to remedy them are described.
The simplified circuit diagram in section 8.17 "Error ranges and causes" on page 33 permits fast and efficient error
remedy.
The controller outputs at the actual value output 13 voltage levels for error diagnosis. Internally in the controller,
the error messages are differentiated in even more detail. The described error numbers can be displayed with the
ROPEX visualisation software (
section 8.11 "USB interface for visualisation software ROPEXvisual
page 27). The error search can thus be performed even more effectively.
Evaluation of the actual value output for detection of an error message - e.g. in the higher-order
controller - must be done with an adapted tolerance window to avoid incorrect evaluations. The tol-
erances of the actual value output must be observed (
section 10 "Technical data" on page 35).
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