Mitsubishi FX3U Series User Manual page 43

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
Special Device
CH1 CH2
M8408 M8428
M8409 M8429
M: Master S: Slave
Name Valid
Set while the master sends retries when the slave
fails to respond in time.
Special clear conditions:
1) Power on
Retry M
2) STOP to RUN
3) If another MODBUS command is triggered
As long as the slave responds on one of the retries
the error flag will not be set.
Set if a response timeout occurs.
Special clear conditions:
1) Power on
2) STOP to RUN
Timeout S
3) If another MODBUS command is triggered
Note: If the number of retries is > 0, the error flag is
R: Read W: Write
6 Related Devices and Communication Status
Detailed Description
not set until the selected number of retries
failed by a timeout (or another failure).
6.3 Special Auxiliary Relays
R / W
R
R
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