Festo CPX-CMAX-C1-1 User Manual

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

Festo CPX-CMAX-C1-1 Specifications

General

Brand	Festo
Model	CPX-CMAX-C1-1
Category	Controller
Language	English