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APPENDIX
Appendix 1 Special Relay List
SM8573 Carrier detection flag (ch2) This device turns ON in synchronization with the CD (DCD) signal. R
SM8574 Data set ready flag (ch2) This device turns ON in synchronization with the DR (DSR) signal. R
SM8575 Time-out check flag (ch2) This device turns ON when data receiving is suspended and the
next set of receive data is not given within the time set by the time-
out time setting device.
R
SM8580 Data transfer delayed (ch3) This device remains ON while the PLC is waiting to send. R
SM8581 Data transfer flag (ch3) When this device is set to ON, the PLC starts to send. R
SM8582 Receive completion flag (ch3) This device turns ON when receiving is completed. R
SM8583 Carrier detection flag (ch3) This device turns ON in synchronization with the CD (DCD) signal. R
SM8584 Data set ready flag (ch3) This device turns ON in synchronization with the DR (DSR) signal. R
SM8585 Time-out check flag (ch3) This device turns ON when data receiving is suspended and the
next set of receive data is not given within the time set by the time-
out time setting device.
R
SM8590 Data transfer delayed (ch4) This device remains ON while the PLC is waiting to send R
SM8591 Data transfer flag (ch4) When this device is set to ON, the PLC starts to send R
SM8592 Receive completion flag (ch4) This device turns ON when receiving is completed R
SM8593 Carrier detection flag (ch4) This device turns ON in synchronization with the CD (DCD) signal R
SM8594 Data set ready flag (ch4) This device turns ON in synchronization with the DR (DSR) signal R
SM8595 Time-out check flag (ch4) This device turns ON when data receiving is suspended and the
next set of receive data is not given within the time set by the time-
out time setting device
R
SM8740 Station No. setting SD latch enabled (ch1) OFF: Latch disabled
ON: Latch enabled
R
SM8750 Station No. setting SD latch enabled (ch2) OFF: Latch disabled
ON: Latch enabled
R
SM8760 Station No. setting SD latch enabled (ch3) OFF: Latch disabled
ON: Latch enabled
R
SM8770 Station No. setting SD latch enabled (ch4) OFF: Latch disabled
ON: Latch enabled
R
SM8800 MODBUS RTU communication (ch1) OFF: Communication stop
ON: Communication
R
SM8801 Retry (ch1) OFF: No retry
ON: Retry
R
SM8802 Timeout (ch1) OFF: No timeout
ON: Timeout
R
SM8810 MODBUS RTU communication (ch2) OFF: Communication stop
ON: Communication
R
SM8811 Retry (ch2) OFF: No retry
ON: Retry
R
SM8812 Timeout (ch2) OFF: Not timeout
ON: Timeout
R
SM8820 MODBUS RTU communication (ch3) OFF: Communication stop
ON: Communication
R
SM8821 Retry (ch3) OFF: No retry
ON: Retry
R
SM8822 Timeout (ch3) OFF: No timeout
ON: Timeout
R
SM8830 MODBUS RTU communication (ch4) OFF: Communication stop
ON: Communication
R
SM8831 Retry (ch4) OFF: No retry
ON: Retry
R
SM8832 Timeout (ch4) OFF: No timeout
ON: Timeout
R
SM8861 Host station No. setting SD latch enabled (ch1) OFF: Latch disabled
ON: Latch enabled
R
SM8871 Host station No. setting SD latch enabled (ch2) OFF: Latch disabled
ON: Latch enabled
R
SM8881 Host station No. setting SD latch enabled (ch3) OFF: Latch disabled
ON: Latch enabled
R
No. Name Description R/W