Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 274

No. Name
SM8408 MODBUS retry (ch1)
SM8409 RS2 Time-out check flag (ch1)/MODBUS Timeout (ch1)
SM8421 RS2 Send wait flag (ch2)/MODBUS request in process
(ch2)
SM8422 MODBUS communication error (ch2)
SM8423 MODBUS communication error (latched) (ch2)
SM8424 RS2 Carrier detection flag (ch2)/MODBUS communication
mode (ch2)
SM8425 RS2 Data set ready (DSR) flag (ch2)
SM8428 MODBUS retry (ch2)
SM8429 RS2 Time-out check flag (ch2)/MODBUS Timeout (ch2)
SM8438 Serial communication error 2 (ch2)
SM8492 IP address storage area write request
SM8493 IP address storage area write completed
SM8494 IP address storage area write error
SM8495 IP address storage area clear request
SM8496 IP address storage area clear completed
SM8497 IP address storage area clear error
SM8498 IP address change function enable flag
Serial communication
The special relays for serial communication are shown below.
R: Read only, R/W: Read/Write
No. Name
SM8500 Serial communication error (ch1)
SM8510 Serial communication error (ch2)
SM8520 Serial communication error (ch3)
SM8530 Serial communication error (ch4)
SM8560 Data transfer delayed (ch1)
SM8561 Data transfer flag (ch1)
SM8562 Receive completion flag (ch1)
SM8563 Carrier detection flag (ch1)
SM8564 Data set ready flag (ch1)
APPENDIX
272
Appendix 1 Special Relay List
Description
OFF: Not retry
ON: Retry
ON when time-out occurs.
ON during send wait or MODBUS communication
OFF: No error
ON: Error
OFF: No error
ON: Error (latch)
Carrier detection flag or listen only mode ON when operating.
OFF: DSR not detected
ON: DSR detected
OFF: No retry
ON: Retry
ON when timeout occurs.
OFF: No error
ON: Error
If OFF to ON, the IP address setting stored in SD8492 to SD8497
will be written in the IP address storage area.
• It turns on, if the write to the IP address storage area is
completed. Moreover, it turns on also at the time of the write-in
failure.
• Turns OFF when IP address storage area write request
(SM8492) turns from ON to OFF.
• Turns ON when writing to IP address storage area is failed.
• Turns ON if there is a problem in contents of IP address storage
area, when PLC power supply is turned from OFF to ON.
• Turns OFF when IP address storage area write request
(SM8492) turns from ON to OFF.
Contents of IP address storage area are cleared when this device
turns from OFF to ON.
• It turns on, if the clear to the IP address storage area is
completed. Moreover, it turns on also at the time of the clear-in
failure.
• Turns OFF when IP address storage area clear request
(SM8495) turns from ON to OFF.
• Turns ON when clear to IP address storage area is failed.
• Turns OFF when IP address storage area clear request
(SM8495) turns from ON to OFF.
Turns ON when IP address is changed by IP address change
function.
Description
OFF: No error
ON: Error
OFF: No error
ON: Error
OFF: No error
ON: Error
OFF: No error
ON: Error
This device remains ON while the PLC is waiting to send.
When this device is set to ON, the PLC starts to send.
This device turns ON when receiving is completed.
This device turns ON in synchronization with the CD (DCD) signal.
This device turns ON in synchronization with the DR (DSR) signal.
R/W
R
R
R
R
R
R
R
R
R
R
R/W
R
R
R/W
R
R
R
R/W
R
R
R
R
R
R
R
R
R