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How to avoid slow data updates on a Modbus network with an MVI56(E)-MCM or MVI69-MCM when some Slaves are either not on-line or not functioning correctly? |
Article Number: 384 | Rating: 5/5 from 1 votes | Last Updated: Thu, Feb 26, 2015 at 5:46 PM |
A customer wrote: "Prosoft Modbus communication modules for Allen Bradley, like MVI56-MCM, experience timeout problems and polling delays on RS-485 multipdrop networks if slaves are powered off or faulty. Prosoft Technical Support responded: "On a master/slave multidrop network, the master must send a message to the slave device then wait a configured amount of time for a response from that slave. If the slave fails to respond or the master receives an invalid response, the master (the ProSoft MCM solution) will then retry for the configured number of retries before moving on to the next command in the list.
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