IO-Link Master with EtherNet/IP Interface StandardLine 4 Ports IP 65 / IP 66 / IP 67
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Use acyclic services
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The AL1120 offers the following options to execute acyclic commands:
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Command channels in cyclic process data
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Within the cyclic input and output data, special areas are available for the acyclic data transmission.
Both read and write access can be implemented via the areas.
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Principle of the command channels
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General process of an acyclic communication:
1 Write command request
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In the request channel: write requested command data (without [Trigger] bit)
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Set [Trigger] = 1.
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Change of [Trigger] = 1 indicates a new command.
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In the response channel: all bytes are set to 0.
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Command processing is started.
2 Check status
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In the response channel: check [Handshake] bit.
If [Handshake] <> 0: command processing completed, continue with step 3.
If [Handshake] == 0: command is processed, repeat step 2.
3 Read command response
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In the response channel: read responsed user data.
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In the request channel: set [Trigger] = 0.
