Festo Parameter Channel (Fpc) - Festo CPX Series Manual

6. Parametrisation
6.1

Festo Parameter Channel (FPC)

FPC
Byte 1
Request Subindex
Response Subindex
Tab. 6/1: Structure of FPC
Parameter identifier
Bit 15 14
Request Request Identifier
Response Response identifier
Tab. 6/2: Structure of parameter identifier
Component
Parameter identifier
Request identifier
Response identifier
Parameter number
Subindex
Parameter value
Tab. 6/3: FPC components
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
The FPC is used for transmitting parameters. The PLC sends
a request to the CMAX consisting of a parameter number,
a subindex, a value and a task identifier. The CMAX responds
with the PNU, the subindex, the value and a response
identifier. This process takes several bus cycles.
Byte 2 Byte 3
Parameter identifier
Parameter identifier
13 12 11 10
Parameter number
Parameter number
Abbrevia Description
tion
ParID 16 bit identifier, consisting of ReqID/ResID and parameter
number.
ReqID Request identifier:
Reading value, Changing value, ...
ResID Response identifier
Value transmitted, error ...
PNU Parameter number for addressing a parameter.
IND Subindex for addressing an array element.
Value Parameter value (in the event of an error the error number as
a response)
Byte 4 Byte 5
Parameter value
Parameter value
9 8 7 6 5
Byte 6 Byte 7
4 3 2 1 0
6−3