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
(
General procedure of the acyclic communication:
1 Write Command Request
►
In the request channel: Write required data (except for [User ID]).
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Write required [User ID].
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Changed [User ID] signals a new command.
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In the response channel: registers are reset to 0.
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Acyclic command channel is blocked.
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Processing of the command is started.
2 Check status
►
In the response channel: Check [Command Status] register.
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If [Command Status] <> 0: continue with step 3
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If [Command Status] == 0: repeat step 2.
3 Read Command Response
►
In the response channel: read returned user data.
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Acyclic command channel is released.