Appendix 3 Link Special Relay (Sb) List - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

APPENDICES

Appendix 3 Link Special Relay (SB) List

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The link special relay (SB) turns on/off by various factors that occur during data linking.
The error status of the data link can be checked by monitoring or using it in the
sequence program.
The link special relay (SB) that stored the link status is used for the detailed
information of the network diagnostics of GX Developer. For a list of the device
numbers for each display item, refer to Section 8.1, "Network Diagnostics (Network
Monitor)" and Section 8.3.1, "How to check error codes".
(1) Mounting multiple network modules
The link special relay (SB) of each network module is refreshed by the link
special relay (SB) of the CPU module shown below when the refresh parameters
of each network module remain default.
Module installing position
Device number
(2) Range turned ON/OFF by user and range turned ON/OFF by
system
In the link special relay (SB), there are ranges the user can set on and off
(SB0000 to SB001F) and ranges the system can set on and off (SB0020 to
SB01FF). (When the module is installed in the position of Module 1.)
(3) Link special relay (SB) list
Assignments of SB0000 to SB01FF are shown in the special relay (SB) list.
POINT
(1) Do not turn ON the area of the No. which does not exist in the link special
relay (SB) list.
Turning ON the area of the number which does not exist in the list may cause
malfunction of the programmable controller system.
(2) For how to use link special relays (SB), refer to Section 6.4.
Module 1 Module 2
SB0000 to 01FF SB0200 to 03FF SB0400 to 05FF SB0600 to 07FF
MELSEC-Q
Module 3 Module 4
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