App-181
8
8
8
8
A
6
7
8
Appendix3 SPECIAL RELAY LIST
(14) Redundant system (tracking information)
The special relay (SM1700 to SM1799) is valid when the redundant system is in backup mode or in separate
mode. All bits are set to off for stand-alone systems.
Number
Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
M9
Corres-
ponding
CPU
SM1700
Transfer trigger
completion flag
OFF : Transfer not
completed
ON : Transfer
completed
This relay remains on for one scan upon
completion of a transfer for any of the blocks 1 to
64.
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
• This relay is turned from off to on to enable the
user to switch a system during online program
change for redundancy.
After the manual system switching disable
status is canceled, the system automatically
turns off SM1709.
• A system can be switched even a online
program change for redundancy is being
performed and regardless of the status of this
relay, if the reason for the switching is any of the
following:
•Power-off
•Reset
•Hardware failure
•CPU stop error
• The system switching disable status can also be
canceled by this relay during the following
states.
•Multiple-block online program change
redundant tracking execution status
•File batch online program change redundant
tracking execution status
S (Request)/U
SM1710
Transfer tracking
data during online
program change
enable flag
OFF : No device
tracking
ON : Transfer device
memory
• This relay specifies whether to execute a
tracking transfer for the following control data
during online program change for redundancy.
•Device memory (Including SMs and SDs that
automatically execute a tracking transfer)
•PIDINIT information, S.PIDINIT information,
SFC information
• SM1710 can be also used to specify whether to
enable a tracking transfer whhle multiple-block
online program change redundant tracking and
while file batch online program change
redundant tracking.
• SM1710 is transferred from the cjntrol system to
the standby system by tracking transfer.
U
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