Chapter 13 Warning CodesMS300
532
Modbus TCP exceeds the maximum communication
value
Warning Setting Parameter
The Master communication value
exceeds the allowable number of
the communication cards
Decrease the Master communication value
Connection occupied due to not
disconnecting the Modbus TPC
while the upper unit is connected
without communicating.
Revise the program of the upper unit to disconnect the connection while the
communication is not used for a long time.
A new Modbus TCP connection is
built whenever the upper unit is
connected to the communication
card, which causes connection
occupied.
Revise the program of the upper unit to use the same Modbus TCP connection
when connecting to the same communication card.