6 Diagnostics and error handling
68 Festo – P.BE-CPX-CMAX-SYS-EN – en 2017-09b – English
6.4.2 Acknowledgement of faults and warnings – reset type
Acknowledge fault
Faults must be acknowledged with CCON.RESET before a new positioning command can be started. In
most cases, the cause of the fault must be eliminated.
1. Rising edge at CCON.RESET.
2. Wait 3 s (depending on the fault, the CMAX requires a maximum of 3 seconds, e.g. to initialize the
axis).
3. Check whether the fault has been eliminated:
– If SCON.FAULT = 0: ok
– If SCON.FAULT = 1: check error number, eliminate cause è Section 6.4.4.
In principle, the CMAX always tries to acknowledge all currently pending faults. If several faults are
active at the same time, the behaviour is oriented on the most serious fault è Section 6.4.1.
If there are several faults pending and one fault can be deleted after a reset, but not others, one of the
remaining faults is displayed after the reset.
The reactions of the CMAX to acknowledgement of various faults are divided into reset types
è Tab. 6.7.
Reset type
Significance Action when acknowledging
R Reset The “fault” status is exited
F Reset if fixed The “fault” status is exited if the cause has already been
eliminated (example: E51 active and load voltage has not
been applied again).
N New initialisation and reset The CMAX newly initialises the components valve and
sensor interface as well as the controller. If no fault
occurs, the “fault” status is exited.
The maximum time for a restart is 3 s.
After the restart, homing must be performed again.
Poff Reset with power off The CMAX does not react to acknowledgement
(CCON.RESET). The CPX terminal with the CMAX must be
switched off and back on again or a “Restart CPX
terminal” must be performed in the FCT (from V2.2).
Tab. 6.7 Reset types
Acknowledging warnings
Warnings do not have to be acknowledged. With rising edge at CPOS.START (new positioning command)
or CCON.RESET (provided the cause has been eliminated), SCON.WARN = 0 is set.
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