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I am trying to implement a Modbus RTU system (PLC to 4 slaves) and have found it necessary to set the polling delay to 100mS for reliable operation.
The problem appears to be with the slave response.
I understood that if a slave receives a normal (error-free) message that it will respond. There will be minimal time required following a response before a slave is ready to accept another message. There is no indication of a polling delay being required in the Modbus Protocol.
Why is a 100mS delay required and is there anything that can be done to reduce the delay?
The problem appears to be with the slave response.
I understood that if a slave receives a normal (error-free) message that it will respond. There will be minimal time required following a response before a slave is ready to accept another message. There is no indication of a polling delay being required in the Modbus Protocol.
Why is a 100mS delay required and is there anything that can be done to reduce the delay?