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Appendix 3 List Of Link Special Relay (sb) - Mitsubishi Electric RD77GF8 User Manual

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Appendix 3
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 Field Network 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 70 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 SB01FF.
• Turned on/off by users: SB0000 to SB001F
• Turned on/off by the system: SB0020 to SB01FF
List of link special relay (SB)
The following table lists the link special relay areas (SB) when they are assigned from SB0000 to SB01FF.
Do not turn on or off areas whose Nos. 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
SB0000
Link startup of own station
SB0001
Link stop of own station
SB0002
System link startup
SB0003
System link stop
SB0006
Clear communication error count
List of Link Special Relay (SB)
Description
Starts data link (cyclic transmission) of the own station.
Off: Startup not requested
On: Startup requested (valid at rising edge)
(Conditions)
• This relay is enabled when "Baton pass status of own station" (SB0047) is off.
• For SB0000 to SB0003, only one of the areas can be turned on.
Stops data link (cyclic transmission) of the own station.
Off: Stop not requested
On: Stop requested (valid at rising edge)
(Conditions)
• This relay is enabled when "Baton pass status of own station" (SB0047) is off.
• For SB0000 to SB0003, only one of the areas can be turned on.
Starts data link (cyclic transmission) of the entire system. The station where cyclic transmission is started is
specified in "Link startup/stop direction" (SW0000) and "Link startup/stop station specification" (SW0001 to
SB0008).
Off: Startup not requested
On: Startup requested (valid at rising edge)
(Conditions)
• This relay is enabled when "Baton pass status of own station" (SB0047) is off.
• For SB0000 to SB0003, only one of the areas can be turned on.
Stops data link (cyclic transmission) of the entire system. The station where cyclic transmission is stopped is
specified in "Link startup/stop direction" (SW0000) and "Link startup/stop station specification" (SW0001 to
SW0008).
Off: Stop not requested
On: Stop requested (valid at rising edge)
(Conditions)
• This relay is enabled when "Baton pass status of own station" (SB0047) is off.
• For SB0000 to SB0003, only one of the areas can be turned on.
Clears the link special register areas related to communication errors (SW0068 to SW006B, SW0074 to
SW0077, SW007C to SW007F, SW0120 to SW015F) to 0.
Off: Clear not requested
On: Clear requested (valid while on)

Appendix 3 List of Link Special Relay (SB)

A
APPX
143

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