Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 40

MODBUS communication error (latched)
This device checks if an error occurs during MODBUS serial communication.
For FX3 compatibility
CH1
SM8403
R: Read
Precautions
Do not turn ON with program or engineering tool.
The device is cleared when the power supply is turned from off to on, reset, or set from STOP to RUN.
Serial communication error
This device checks if an error occurs during serial communication.
Only for FX5
CH1 CH2
SM8500 SM8510
R: Read
Precautions
Do not turn ON with program or engineering tool.
This device do not turn OFF even if normal communication is restored. The device is cleared when the power supply is turned
from off to on, reset, set from STOP to RUN, or SM50 (Error Detection Reset Completion) is turned on.
Retry
This device checks if a retry occurs during MODBUS serial communication.
Only for FX5
CH1 CH2
SM8801 SM8811
R: Read
Precautions
Do not turn ON with program or engineering tool.
The device is cleared when the power supply is turned from off to on, reset, set from STOP to RUN, SM50 (Error Detection
Reset Completion) is turned on, or the next ADPRW instruction is executed.
7 FUNCTION
38
7.3 Related Devices
CH2
SM8423
For FX3 compatibility
CH3 CH4 CH1
SM8520 SM8530 SM8063
For FX3 compatibility
CH3 CH4 CH1
SM8821 SM8831 SM8408
Description
Turns on once an error occurs during MODBUS serial
communication.
Description
CH2
SM8438 Turns on when an error occurs during serial
communication.
Description
CH2
SM8428 Turns on while the master sends retries when the slave
fails to respond in time.
R/W
R
R/W
R
R/W
R