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APPX
Appendix 1 Special Relay List
*1 Enabled only when the STL instruction is used.
LC count direction monitor
This is the device to monitor the directions of the counters from LC46 to LC55 when the FX3 compatible high-speed counter is
used.
■Operation description
The content of the operation when ON and when OFF is as follows.
■Update timing
The timing of device update is as follows.
SM8429 RS2 Time-out check flag (CH2)/MODBUS
Timeout (CH2)
ON when timeout occurs. R
SM8438 Serial communication error 2 (CH2) OFF: No error
ON: Error
R
SM8439 Absence/presence of MC protocol (CH2) Turns ON when MC protocol is set for serial
communication.
R
SM8492 IP address storage area write request If OFF to ON, the IP address setting stored in
SD8492 to SD8497 will be written in the IP
address storage area.
R/W
SM8493 IP address storage area write completed • 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.
R
SM8494 IP address storage area write error • 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.
R
SM8495 IP address storage area clear request Contents of IP address storage area are cleared
when this device turns from OFF to ON.
R/W
SM8496 IP address storage area clear completed • 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.
R
SM8497 IP address storage area clear error • 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.
R
SM8498 IP address change function enable flag Turns ON when IP address is changed by IP
address change function.
R
Operation when ON Operation when OFF
High-speed counter counting in direction whereby current value is reduced
(Down-counting)
High-speed counter counting in direction whereby current value is increased
(Up-counting)
ON OFF
• Down-counting (This is updated with the END processing. When the FX3
compatible high-speed counter function is valid, the updating is made also
when UDCNTF instruction is executed ON.)
• Up-counting (This is updated with the END processing. When the FX3
compatible high-speed counter function is valid, the updating is made also
when UDCNTF instruction is executed ON.)
• Power ON, reset
•STOP/PAUSERUN
No. Name Description Compatible CPU module R/W
FX5S FX5UJ FX5U/
FX5UC
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