5. Parameter
5−8
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
5.2.2 Access via PLC and FCT
Simultaneous operation of the drive through PLC and FCT can
be locked. This is done with the bits CCON.LOCK (FCT access
blocked) and SCON.FCT_MMI (device control FCT).
Preventing FCT operation: CCON.LOCK
By setting the CCON.LOCK control bit (bit 5) the PLC prevents
the FCT from taking over device control. So if the LOCK
is set,
FCT cannot write parameters or control the drive.
The PLC should be programmed not to issue this release until
the user carries out the relevant action. This generally exits
automatic operation. This means that the PLC programmer
can ensure that the PLC always knows when it has control
over the drive.
The
lock is active if the CCON.LOCK has a 1 signal. It is not
mandatory to set it. If such a lock is not required, CCON.LOCK
can always be set to 0.
A subset of the parameters can also be written by the FCT if
the device control is not active. This concerns the
parameters
that can be modified during optimisation".
Record list (accelerations and workpiece mass),
Controller amplifications,
Several diagnostic parameters for the FCT.
Control sovereignty acknowledgment for FCT:
SCON.FCT_MMI
SCON.FCT_MMI indicates that the drive is controlled by the
FCT and that no control over the drive is possible via the I/O
data. The PLC can react by
switching to stop or manual oper
ation.
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