Structure Of The Cyclical I/O Data - Festo CPX-CMAX-C1-1 Mounting, Installation And Diagnostics

4. Commissioning
4.5

Structure of the cyclical I/O data

Data Byte 1
O data Bytes 1 and 2 (fixed)
are retained in every
operating mode
(except for byte 2
during parameter
isation).
They contain control They contain control
I data
and status bytes
(e.g. CCON,
SCON, ...) for enab
ling the CMAX and
setting the operat
ing modes
4−16
Byte 2 Byte 3
Bytes 3 to 8 depend on the selected operating mode (record select
mode) 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
Other operating mode and control mode−dependent setpoint
and actual values. and actual values
Procedure
First define the operating mode in the control byte CCON. See
section 4.5.1.
This results in the allocation of the other control and status
bytes:
Record select mode, see section 4.5.2.
Direct mode, see section 4.5.3.
For commissioning and parameterisation, see the CMAX
communication profile" description.
Recommendation: Set the control bit CCON.LOCK during oper
ation. This way, the PLC can make sure that the programmed
sequence cannot be disturbed by FCT access.
Or evaluate the status bit SCON.FCT_MMI and take the mis
sing control access into account in the program sequence of
the PLC.
Byte 4 Byte 5
Festo P.BE−CPX−CMA X−SYS−EN en 0908NH
Byte 6 Byte 7 Byte 8