Festo CPX-CMAX-C1-1, Mounting, Installation And Diagnostics

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4. Commissioning
4−23
Festo P.BE−CPX−CMA X−SYS−EN en 0908NH
4
The CMAX now signalises with the rising edge at
SPOS.ACK that the PLC output data have been accepted
and that the positioning job is now active.
5
The PLC detects the acknowledgement ACK
(SPOS.ACK = 1) in its input data and resets CPOS.START
in its output data.
6
CMAX acknowledges the resetting of CPOS.START by
resetting SPOS.ACK.
The positioning command will be further executed.
7
After the PLC has detected SPOS.ACK = 0, it may write
new setpoint values in its output data. The CMAX ignores
this until the next start.
If the record or the record switching has been ended,
SPOS.MC is set (see Fig.4/3).
Instructions:
As soon as the PLC detects the rising edge at SPOS.ACK,
it can assume that MC is valid.
From the perspective of the PLC, the falling edge at MC
can come at the same time as the rising edge at ACK.
3
and
4
can then not be distinguished.
In the event of malfunctions, the job might not be
acknowledged with SPOS.ACK. For this reason, the
SCON.FAULT bit must always be evaluated, too.