Yokogawa Standalone MW100 - Manual (Page 111)

App-9
IM MW100-17E
Appendix
1
2
3
App App
Index
Appendix 3 Modbus Communication Timeout
This MW100 has a function in which, communication with Modbus slave devices that
could not receive a response after the number of retries or more is dropped every
communication interval by access sequence. Communication with Modbus slave devices
dropped in sequence is retried after the communication wait time has elapsed.
Modbus Master Timer Function
Modbus master
(command)
Retransmission
Modbus slave
(response)
Communication with
non-responding instrument
One communication
session
(No response)
Communication
cycle
Wait time
Communication interval Communication recovery wait
Time
Recovery
Communication
timeout
0 0 1 2 0 0
Timeout Types
Timeout Description
Communication cycle Modbus master command list (communication sequence)
execution interval
Retransmission When fails to receive response message, maximum number
of retries until communication recovery wait status.
Wait time Wait time until the next command message is sent to
instruments that entered the communication recovery wait
status.