IFM AL1340 - Page 75

IO-Link Master with Modbus TCP Interface DataLine 4 Ports IP 65 / IP 66 / IP 67
75
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Use acyclic services
34471
The AL1340 has a command interface to execute acyclic commands. A cyclic command consists of a
request and a response.
Register
Contents
Access
500
Command Request Channel (Fieldbus PLC >>> IO-Link Master)
r/w
0
Command Response Channel (IO-Link Master >>> Fieldbus PLC)
r
Structure of the acyclic command channel: →Acyclic Command Channel (→ S. 100)
General procedure of the acyclic communication:
1 Write Command Request
► In the request channel: Write required data (except for [User ID]).
> Write required [User ID].
> Changed [User ID] signals a new command.
> In the response channel: registers are reset to 0.
> Acyclic command channel is blocked.
> Processing of the command is started.
2 Check status
► In the response channel: Check [Command Status] register.
> If [Command Status] <> 0: continue with step 3
> If [Command Status] == 0: repeat step 2.
3 Read Command Response
► In the response channel: read returned user data.
> Acyclic command channel is released.