Chapter 3
Fieldbus Specific Mailbox Commands
Alter amounts of PCP words (SET_PCP_WORDS)
The amount of PCP words can be set to 0, 1, 2 or 4 words. If parameter data has been selected by the
Anybus_INIT command, one PCP word is used by default. If no parameter data has been selected, the
default number of PCP words is 0.
Command and response layout:
Parameter
Description
Command initiator
Application
Command Name
SET_PCP_WORDS
Message type
02h
Command number
0001h
Fragmented
No
Extended Header data
-
Command data
Number of PCP words
Response data
The message data contains the requested PCP length. If the SET_PCP_WORDS mailbox
message is wrong, see error code. If error code Fh is displayed, see Extended word 8 for
details:
0001h - Non valid value (0, 1, 2, 4).
0002h - Does not fit with the current process data length.
0003h - Can not disable PCP data since parameter data exists.
Command
Expected response
Message ID
(ID)
(ID)
Message information
4002h
0002h
Command
0001h
0001h
Data size
0001h
0001h
Frame count
0001h
0001h
Frame number
0001h
0001h
Offset high
0000h
0000h
Offset low
0000h
0000h
Extended word 1
-
-
Extended word 2
-
-
Extended word 3
-
-
Extended word 4
-
-
Extended word 5
-
-
Extended word 6
-
-
Extended word 7
-
-
Extended word 8
-
Fault information
Message data byte 1
Number of PCP words
Number of PCP words