Appendix 4 Link Special Relay (Sb) - Mitsubishi Electric MELSEC L Series User Manual

Appendix 4
The link special relay (SB) is turned on/off depending on various factors during data link. An error status of the data link
can be checked by monitoring it.
(1) Application of link special relay (SB)
By using the link special relay (SB), the status of CC-Link IE Field Network can be checked from HMI (Human
Machine Interfaces) as well as GX Works2.
(2) Areas turned on/off by users and by the system
• Area turned on/off by the system: SB0000 to SB0FFF
• Area turned on/off by users: SB1000 to SB1FFF
(3) List of link special relay (SB) areas
The following lists the link special relay (SB) areas.
Do not turn on or off an area whose number is not in the list. Doing so may cause malfunction of the programmable controller
system.
No.
Operating station number
SB004F
status
PORT1 link-up status
SB006A
(own station)
PORT2 link-up status
SB006B
(own station)
SB1000 to For the CC-Link
SB1FFF master/local module
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Link Special Relay (SB)
Name
Stores information on whether the module is operating with the network number and station
number set in the "Communication Head Setting" of PLC Parameter, or with the numbers set in
the CC-Link IE Field Network diagnostics.
OFF: Operating using the values set in "Communication Head Setting" of PLC Parameter
ON: Operating using the values set in the CC-Link IE Field Network diagnostics
This area also turns on in the following cases:
• There is no parameter in the head module.
• The "Network No." and "Station No." fields are left blank in "Communication Head Setting" of
PLC Parameter, and no station number has been set in the CC-Link IE Field Network
diagnostics.
Stores the linkup status of PORT1 (own station).
OFF: Link-up
ON: Link-down
The time that link-up starts after power-on or Ethernet cable connection may vary. Normally link-
up takes several seconds. Depending on device status on the line, the link-up processing is
repeated, resulting in the increase in the time.
Stores the linkup status of PORT2 (own station).
OFF: Link-up
ON: Link-down
The time that link-up starts after power-on or Ethernet cable connection may vary. Normally link-
up takes several seconds. Depending on device status on the line, the link-up processing is
repeated, resulting in the increase in the time.
By setting these areas as the refresh destination device of the link special relay (SB) of the CC-
Link master/local module, the data link status of CC-Link can be checked.
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