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52 •
750-671 [Steppercontroller]
Process
Image
WAGO-I/O-SYSTEM
750
I/O
Modules
The control byte and status byte for the mailbox have the following function:
Control_MBX
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Toggle-
Flag
0 0 0 0 0 0 0
Toggle-Flag
If the data that have been written to the mailbox are to be accepted, the status of this bit is
changed. Data is also accepted when an opcode is specified that is different from the
previous one. Therefore: First write the data and then the opcode!
0 Reserved
Status_MBX
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Toggle-
Flag
Return-Code
Return-Code
The return code indicates whether the last command has been executed without any errors.
If so, a value of 0 is returned. When the return code provides a value other than 0, you
must check the corresponding opcode. The return messages are then individual.
Toggle Flag
The mailbox is evaluated when the status of the toggle flag is different in the
Control_MBX. The status of the bit is then also changed.