750-671 [Steppercontroller]
•
51
Process Image
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.2.7.4
Mailbox Process Image
The process image appears as follows when the mailbox is activated (C0.5 =
1):
Off-
set
Input Data
Output Data
0
S0
Status byte S0
C0
Control byte C0
1 Reserved
Reserved
2
MB0
Opcode
MB0
Opcode
3
MB1
Status_Mbx
MB1
Control_Mbx
4
MB2
Reply
Parameter byte 1
MB2
Request
Parameter byte 1
5
MB3
Reply
Parameter byte 2
MB3
Request
Parameter byte 2
6
MB4
Reply
Parameter byte 3
MB4
Request
Parameter byte 3
7
MB5
Reply
Parameter byte 4
MB5
Request
Parameter byte 4
8 Reserved
Reserved
9
S3
Status byte S3
C3
Control byte C3
10
S2
Status byte S2
C2
Control byte C2
11
S1
Status byte S1
C1
Control byte C1
The individual applications can be set using opcodes.
Opcodes are assigned to different topical areas and are described in the
sections that follow.