Appendix 4 List Of Link Special Relay (Sb) - Mitsubishi Electric MELSEC iQ-R Series User Manual

Appendix 4
The link special relay (SB) is turned on/off depending on various factors during data link. Any error status of the data link can
be checked by using or monitoring it in the program.
Application of link special relay (SB)
By using link special relay (SB), the status of CC-Link IE TSN can be checked from HMI (Human Machine Interfaces) as well
as the engineering tool.
Refresh of link special relay (SB)
To use link special relay (SB), set them in "Refresh Setting" in "Basic Settings" so that they are refreshed to the devices or
labels of the CPU module. ( Page 99 Refresh Settings)
Ranges turned on/off by users and by the system
The following ranges correspond to when the link special relay areas (SB) are assigned from SB0000 to SB0FFF.
• Turned on/off by users: SB0000 to SB001F
• Turned on/off by the system: SB0020 to SB0FFF
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 on the following list or ranges turned on/off by the system.
Doing so may cause malfunction of the programmable controller system.
No. Name
SB0006 Clear communication
error count
SB0014 Cyclic data receive
status clear
SB0016 Remote device forced
output request
SB0030 RECV execution
request flag CH1
SB0031 RECV execution
request flag CH2
SB0032 RECV execution
request flag CH3
SB0033 RECV execution
request flag CH4
SB0034 RECV execution
request flag CH5
SB0035 RECV execution
request flag CH6
APPX
268

Appendix 4 List of Link Special Relay (SB)

List of Link Special Relay (SB)
Description
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)
Clears 'Cyclic data receive status' (SB0064).
While SB0014 is on, 'Cyclic data receive status' (SB0064) does not turn on.
Off: Clear not requested
On: Clear requested (enabled while on)
Enables the remote device test function.
Off: No request
On: Request issued
Stores the data reception status of own station channel 1.
Off: No data received
On: Data received
Stores the data reception status of own station channel 2.
Off: No data received
On: Data received
Stores the data reception status of own station channel 3.
Off: No data received
On: Data received
Stores the data reception status of own station channel 4.
Off: No data received
On: Data received
Stores the data reception status of own station channel 5.
Off: No data received
On: Data received
Stores the data reception status of own station channel 6.
Off: No data received
On: Data received
Availability
Master Local station
station
Unicast Multicast
mode mode
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