8
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8.3 Using Link Special Relay (SB) and Link Special Register (SW)
8
PROGRAMMING
(15)Checking the redundant system status
The redundant system status can be checked not only from CC IE Control Network
Diagnostics but also by link special relay (SB) and link special register (SW).
(
Section 10.3 CC IE Control Network Diagnostics)
(a) Disabling system switching due to a data link error
(
Section 4.6.2 System switching request to control system CPU)
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).
(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.
Table 8.43 SB/SW used for checking redundant system status of other stations
No.
Description
No.
Description
SB0017
Data-link-error-induced system switching disable
flag
—
SB01C0
Redundant system information
SW01C0 to
SW01C7
Redundant function information
SB01D0
Redundant system status (1)
SW01D0 to
SW01D7
Redundant system status (1)
SB01E0
Redundant system status (2)
SW01E0 to
SW01E7
Redundant system status (2)
SB01F0
Redundant system status (3)
SW01F0 to
SW01F7
Redundant system status (3)
Table 8.44 SB/SW used for checking the redundant system status of own station
No.
Description
No.
Description
SB0041
Host station's redundant function support
information
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