Page 26 AN-X4-AB-DHRIO (DH+) Nov 2022
On the Communication tab:
For the path, type or browse the AN-X name, followed by 1,1 (backplane and slot number of the
emulated 1756-DHRIO)
For the communication path, select DH+. Set the Channel to A and the destination node to the
PLC-5 Data Highway Plus station address. Set the other fields as shown.
Message Queues
AN-X uses two transmit message queues to improve the responsiveness of write messages. The
queues are identified as queue 0 and queue 1.
Write messages are placed in queue 1, which has a higher priority. When AN-X gets the Data
Highway Plus token, it prioritizes queue 1, but ensures queue 0 messages are sent in a timely
fashion as well.
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