communication of TM241 plc to renu electronics slave device

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I am trying to communicate TM 241CE40T with Renu electronics slave devices via modbus i/o scanner , 6 devices are not communication properly , but when i add 7th device , communication fails , if i remove any other device , then communication is ok again (communication is ok as long as total no of devices are 6) i also tried to communicate via read var / write var block , same issue is observed. in manual it is given that 32 devices can be connected to plc which is not in this case correct . can anyone help me regarding this

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