Structure Of The Cyclical I/O Data In The Operating Modes - Festo CPX Series Manual

2. I/O data and sequence control
2.2

Structure of the cyclical I/O data in the operating modes

Data Byte 1
Output Bytes 1 and 2 (fixed)
data are retained in every
operating mode
(except byte 2 for
parametrisation).
They contain control They contain control
and status bytes
Input
(e.g. CCON,
data
SCON, ...) for enab
ling the CMAX and
setting the operat
ing modes
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
Byte 2 Byte 3
Bytes 3 to 8 depend on the selected operating mode (direct mode,
record select) and transmit further control and status bytes (e.g.
CDIR, SDIR,...), as well as setpoint and actual values:
Record number or setpoint position in the output data
Feedback of actual position and record number in the input data
Additional operating mode− and control mode−dependent set Additional operating mode− and control mode−dependent set
point and actual values
Procedure
First define the operating mode in the CCON control byte. See
sections 2.2.1 and 2.2.2.
This results in the assignment of the other control and status
bytes:
Record select mode, see section 2.2.3.
Direct operating mode, see section 2.2.4.
Commissioning mode, see section 2.2.5
Parametrising mode, see section 2.2.6.
Recommendation: During operation, set the control bit
CCON.LOCK. This way, the PLC can ensure that the pro
grammed sequence cannot be disturbed by access with
the FCT.
Evaluate the status bit SCON.FCT_MMI, and take the missing
control access into consideration in the program sequence of
the PLC.
Byte 4 Byte 5 Byte 6 Byte 7 Byte 8
2−7