Delta AH500 Hardware Operation Manual page 468

C h a p t e r 11 C o n v e n i e n t F u n c t i o n s
When a PLC Link is executed, the master station sends reading/writing commands to the slave stations
according to the data exchange table created. Another master station which can send commands is not allowed
to exist. If there is an unknown device which does not appear in NWCONFIG and which can send commands in
an RS-485 network, or there is a device which is designated as a slave station and which can send
reading/writing commands in an RS-485 network, an error occurs when more than one device sends
commands. As a result, after users create a network in NWCONIFG, they have to make sure that the actual
connection is consistent with the network created in NWCONFIG.
Besides, if the users do not set the parameters related to a PLC Link in the original master station again before
they designate another device as a master station, an error occurs when more than one device sends
reading/writing commands. As a result, if the users want to designate another device as a master station, they
have to make sure that the original master station does not execute the original PLC Link.
* In addition to the conditions mentioned above, users have to prevent two devices or more than two devices from
sending reading/writing commands simultaneously in any conditions.
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