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App-143
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Appendix 3 SPECIAL RELAY LIST
(14) For redundant system (tracking)
Either the backup mode or the second mode is valid for SM1700 to SM1799.
All is turned off for stand-alone system.
TableApp.3.15 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
M9
Corresponding
CPU
SM1700
Transfer trigger
completion flag
OFF : Transfer not completed
ON : Transfer completed
• Turns on for one scan, once transfer of block 1 to
block 64 is completed.
S (status change)
New QnPRH
SM1709
Manual system
switching disable/
enable setting during
online program
change redundant
tracking
ON : Manual system
switching enabled
(Disable canceled)
OFF : Manual system
switching disabled
(1) Turning this relay from OFF to ON enables
manual system switching during online program
change redundant tracking.
After the manual system switching disable status
is canceled, the system automatically turns off
SM1709.
(2) System switching due to any of the following
conditions is executed even during online
program change redundant tracking, regardless of
the status of this relay.
•Power off, reset, hardware failure, CPU stop error
(3) In either of the following statuses, the system
switching disable status can also be canceled by
this relay.
•Multiple-block online program change redundant
tracking execution status
•File batch online program change redundant
tracking execution status
S (When
executed)/U
SM1710
Transfer tracking data
during online program
change enable flag
OFF : No device tracking
ON : Transfer device
memory
(1) Set whether the tracking of the following data will
be executed or not during online program change
redundant tracking.
•Device memory
(Including SM/SD that will automatically execute
tracking)
•PIDINIT information, S.PIDINIT information, SFC
information
(2) SM1710 can be also used to set whether tracking
will be executed or not while online change of
multiple program blocks or batch of files is being
performed to ensure consistency of both systems.
(3) This SM is also transferred form control system
CPU module to standby system CPU module by
tracking data.
U