WAGO -I/O-SYSTEM 750 Series Manual page 94

94 • Appendix
Mailbox command - Reference
Set offline mode (SET_OFFLINE, 0x0A)
This call switches between online and offline mode.
Online mode represents the normal mode of operation of the AS-Interface
master. In this case, the following orders are processed cyclically:
• In the so-called data exchange phase, the output data fields for all AS-
Interface slaves of the LAS are transferred to the slave outputs. If the transfer
is free from errors, the addressed AS-Interface slaves pass the values of the
slave inputs to the master.
• This is followed by the acquisition phase, in which a search is carried out
for existing AS-Interface slaves and newly added AS-Interface slaves are
incorporated into the LDS or LAS.
• Orders, which have been passed through by the user, such as the writing of
parameters for example, are executed in the management phase.
In offline mode, the AS-Interface master module only processes orders from
the user. (Orders, which instigate an immediate addressing of an AS-Interface
slave, are rejected with an error). There is no cyclical exchange of data with
the AS-Interface slave.
The AS-Interface circuit is in a safe state when offline.
The bit OFFLINE = TRUE is not permanently stored, i.e. the AS-Interface
master module will be in online mode once more on start-up/following a
restart.
Byte
Offline
Byte
Request
7 6 5
2 2 2
1
2 T -
3
0 The master is leaving the offline phase
not equal The master is changing to the offline phase
to 0
Response
7 6 5
2 2 2
1
2 T
4 3 2 1
2 2 2 2
0x0A
-
Offline
4 3 2 1
2 2 2 2
0x0A
Result
0
2
0
2
WAGO-I/O-SYSTEM 750
I/O Modules