Mitsubishi Electric MELSEC Q Series Reference Manual page 325

(15)Checking the redundant system status
The redundant system status can be checked not only from CC IE Control diagnostics but also by link special
relay (SB) and link special register (SW). (
(a) Disabling system switching due to a data link error
( Page 141, Section 4.7.2)
1.
Set Data-link-error-induced system switching disable flags (SB0017) of both systems to ON.
2.
Even if a data link error is detected, no system switching request will be issued to the control
system CPU.
(b) Checking the redundant system status of other stations
1.
If a redundant system station exists, Redundant system information (SB01C0) is set to ON.
Station numbers of redundant system stations can be confirmed by Redundant function
information (SW01C0 to SW01C7).
2.
If a station in separate mode exists, Redundant system status (1) (SB01D0) is set to ON.
The station No. of the separate-mode station can be checked by Redundant system status (1)
(SW01D0 to SW01D7).
3.
If a station that has a pairing setting exists, Redundant system status (2) (SB01E0) is set to ON.
The station No. of the station with pairing setting can be checked by Redundant system status (2)
(SW01E0 to SW01E7).
4.
If a standby system CPU station exists, Redundant system status (3) (SB01F0) is set to ON.
The station No. of the standby system CPU station can be confirmed by Redundant system status
(3) (SW01F0 to SW01F7).
No.
Data-link-error-induced system switching
SB0017
disable flag
SB01C0 Redundant system information
SB01D0 Redundant system status (1)
SB01E0 Redundant system status (2)
SB01F0 Redundant system status (3)
(c) Checking the redundant system status of own station
When the redundant system is supported, Host station's redundant function support information (SB0041) is
set to ON.
No.
Host station's redundant function support
SB0041
information
Page 526, Section 10.3)
Description
Description
CHAPTER 8 PROGRAMMING
No. Description
—
SW01C0
to Redundant function information
SW01C7
SW01D0
to Redundant system status (1)
SW01D7
SW01E0
to Redundant system status (2)
SW01E7
SW01F0 to
Redundant system status (3)
SW01F7
No. Description
—
8
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