WAGO I/O-SYSTEM 750 Manual page 49

Cyclically updated process data
[XX.XX.XX.XX.XX.XX.XX.XX.XX.XX].00.00
Switching on the mailbox, mailbox command IDLE
(0x00)
[XX.XX.XX.XX].[00.00.00.00].[00.00].00.20
Request for mailbox command GetLinkSignal-
Strength (0xD7)
[XX.XX.XX.XX].[00.00.00].[20].[00.D7].00.20
This queries the receive signal strength for the first slot.
The mailbox includes:
Opcode
0xD7
Toggle byte 0x00
Argument
0x20 (Slot 1)
Filling byte
0x00 (for unused mailbox bytes)
..
Request for mailbox command GetLinkSignal-
Strength
(0xD7)
[XX.XX.XX.XX].[00.00.00].[28].[80.D7].00.20
This queries the receive signal strength with a false
argument. The mailbox includes:
Opcode
0xD7
Toggle byte 0x80 (toggle bit set to execute new
command)
Argument
0x28 (invalid)
Filling byte
0x00 (for unused mailbox bytes)
.
Cyclically updated process data (mailbox masked)
[XX.XX.XX.XX.XX.XX.XX.XX.XX.XX].00.00
Figure 17: Example of mailbox communication
WAGO-I/O-SYSTEM 750
I/O Modules
PIO
Processing Times
Special Modules
PII
Cyclically updated process data
[XX.XX.XX.XX.XX.XX.XX.XX.XX.XX].00.00
Response to mailbox command IDLE
(0x00)
[XX.XX.XX.XX].[00.00.00.00].[00.00].00.60
Response to mailbox command GetLinkSignal-
Strength
(0xD7)
[XX.XX.XX.XX].[00.00.00].[1B].[00.D7].00.60
Response to the query:
Opcode (mirrored)
Toggle bit, return value
Argument
Filling byte
Response to mailbox command GetLinkSignal-
Strength
(0xD7)
[XX.XX.XX.XX].[00.00.00.00].[83.D7].00.60
Response to the query:
Opcode (mirrored)
Toggle bit, return value
Argument
Filling byte
Since an invalid index was used with 0x28, there are no
arguments in the response.
Cyclically updated process data (mailbox masked)
[XX.XX.XX.XX.XX.XX.XX.XX.XX.XX].00.00
I/O Modules • 49
0xD7
0, 0x00
0x1B (value of the signal
strength of the queried
slot)
0x00 (for unused mailbox
bytes)
0xD7
1, 0x03
No argument since invalid
call up
0x00 (for unused mailbox
bytes)
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