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APPX
Appendix 4 List of Link Special Relay (SB)
List of link special relay (SB)
The following table lists the link special relay areas (SB) when they are assigned from SB0000 to SB0FFF.
Do not turn on or off areas whose numbers are not in the following list. Doing so may cause malfunction of the
programmable controller system.
No. Name Description Availability
Master
station
Local station
Unicast
mode
Multicast
mode
SB0006 Clear communication error
count
Clears the link special register areas related to communication
errors (SW0074 to SW0077, SW007C to SW007F) to 0.
Off: Clear not requested
On: Clear requested (valid while on)
SB0014 Cyclic data receive status
clear
Clears 'Cyclic data receive status' (SB0064).
While 'Cyclic data receive status clear' (SB0014) is on, the cyclic
data receive status does not turn on.
Off: Clear not requested
On: Clear requested (enabled while on)
SB0030 RECV execution request flag
CH1
Stores the data reception status of own station channel 1.
Off: No data received
On: Data received
SB0031 RECV execution request flag
CH2
Stores the data reception status of own station channel 2.
Off: No data received
On: Data received
SB0032 RECV execution request flag
CH3
Stores the data reception status of own station channel 3.
Off: No data received
On: Data received
SB0033 RECV execution request flag
CH4
Stores the data reception status of own station channel 4.
Off: No data received
On: Data received
SB0034 RECV execution request flag
CH5
Stores the data reception status of own station channel 5.
Off: No data received
On: Data received
SB0035 RECV execution request flag
CH6
Stores the data reception status of own station channel 6.
Off: No data received
On: Data received
SB0036 RECV execution request flag
CH7
Stores the data reception status of own station channel 7.
Off: No data received
On: Data received
SB0037 RECV execution request flag
CH8
Stores the data reception status of own station channel 8.
Off: No data received
On: Data received
SB0040 Network type of own station Stores the network type of the own station.
On: CC-Link IE TSN
SB0043 Module operation mode of
own station
Stores the module operation mode of the own station.
Off: Online mode
On: Other than online mode
SB0044 Station setting 1 of own
station
Stores the station type of the own station.
Off: Device station (other than the master station)
On: Master station
SB0045 Station setting 2 of own
station
Stores the communication mode of the own station.
Off: Unicast mode
On: Multicast mode
SB0046 Station number setting status
of own station
Stores the station number setting status.
Off: Station number set
On: Station number not set (local station only)
If parameters are set using the engineering tool, this relay is always
off.
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