Diagnostics; Behavior In The Event Of An Error - WAGO -I/O-SYSTEM 750 Series Manual

96

Diagnostics

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9 Diagnostics
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9.1

Behavior in the Event of an Error

The PROFIsafe I/O module detects internal and external errors. Internal errors are
detected by continuous self testing. Depending on the configuration, external
errors are detected and diagnosed by testing the external circuits to the extent
possible. When detecting an external error, a diagnostic message is output to the
safe PLC. The diagnostic messages for external errors are described in the section
"Diagnosis of Errors".
In the event of an error, all digital inputs of the PROFIsafe I/O module are
passivated by outputting the substitute values (failsafe values) instead of actual
process values. For the digital inputs, the substitute values "0" for the process
image are transferred to the safe PLC.
The external errors can be eliminated by maintenance personnel and must then be
acknowledged by the operator triggering an acknowledgement (operator
acknowledgement). Possible acknowledgement is indicated by a 0.5 Hz, green
flashing "PROFIsafe Status" LED. An error check is always performed on
acknowledgement. If the same error, or a different one continues to be present, it
is detected at once and the PROFIsafe I/O module is repassivated.
Both internal and external errors can be evoked by strong EMC events. If an
internal error is diagnosed, the PROFIsafe I/O module switches off for safety. In
this case, acknowledgement by the operator remains ineffective.
To check whether the cause of an internal error was a temporary EMC event and
thus caused the safety-oriented shutdown, switching the entire fieldbus node off
and then on again can be performed in an attempt to activate the PROFIsafe I/O
module again.
If shutdowns occur frequently due to internal errors, the PROFIsafe I/O module
should be replaced.
In this case, return the defective PROFIsafe I/O module to WAGO
Kontakttechnik GmbH & Co. KG for fault analysis.
WAGO-I/O-SYSTEM 750
753-661/000-003 4FDI 24V PROFIsafe V2 iPar
Version 1.4.0, valid from HW/SW Version 01/02
Manual