WAGO -I/O-SYSTEM 750 Series Manual page 116

116 • Appendix
Mailbox command - Reference
Read LCS (GET_LCS_A/B, 0x6C)
This call is used to read out the list of AS-Interface slaves, which have caused
at least one configuration error since the last time the master was switched on
or since the last time this list was read out (LCS). The APF flag is shown in
place of slave 0, which indicates a short-term voltage dip on the AS-Interface.
Using the A and B slave switching, this command can also be used for a 6-
byte mailbox. If the A/B flag is not set, first the data for the A slaves and then
the data for the B slaves are written to a buffer and reset in the master. The
data for the A slaves are then transmitted first from the buffer followed by the
data for the B slaves. If the flag is set, first the data for the B slaves and then
the data for the A slaves are transmitted from the buffer.
Note:
In order to transmit the data for all slaves with a 6-byte mailbox, the
command must be called once with A/B = 0 and once with A/B = 1.
Warning:
With mailboxes larger than 6 bytes, the command may only be called with
A/B = 0, as with A/B = 1 only the data from the buffer are transmitted.
Byte
Byte
...
...
10
Request
7 6 5
2 2 2
1
2 T 0 A/B
Response (A/B = 0)
7 6 5
2 2 2
1
2 T
3 7A 6A 5A
6 31A 30A 29A
7 7B 6B 5B
31B 30B 29B
4 3 2 1
2 2 2 2
0x6C
-
4 3 2 1
2 2 2 2
0x6C
Result
4A 3A 2A 1A
...
28A 27A 26A 25A
4B 3B 2B 1B
...
28B 27B 26B 25B
0
2
0
2
APF
24A
0
24B
WAGO-I/O-SYSTEM 750
I/O Modules