Mitsubishi MELSEC L Series User Manual page 365

(19) Redundant system (tracking information)
The special register (SD1700 to SD1779) is valid only for redundant systems. All bits are set to "0" for stand-alone
systems.
Number Name Meaning
Tracking Tracking
error error
SD1700
detection detection
count count
Waiting time Waiting time
for online for online
program program
SD1710
change change
(standby (standby
system) system)
(20) Redundant power supply module information
The special register (SD1780 to SD1789) is valid only for redundant power supply systems. All bits are set to "0"
for stand-alone power supply systems.
Number Name Meaning
Power supply Power supply
SD1780 off detection off detection
status status
Explanation
• A value in this register is incremented by one upon tracking
error.
• The counter starts the routine: counts up from 0 to 32767,
then counts down to -32767 and then again counts up to 0.
• This register stores the waiting time required for starting the
online program change in the standby system after
completion of that in the control system. The value is
specified in units of seconds.
• If online program change is not requested even after it is
completed in the control system, the CPU modules in both of
the system determine that it is a failure of an online program
change for redundancy.In this case, both system CPU
modules resume the consistency check for the systems that
have been on hold during the online program change.Also,
the control system is set to accept another request of online
program change for redundancy.
• When both systems are powered on, 90 seconds are set to
SD1710 as the default value.
• Set the value within the range 90 to 3600 seconds. When the
setting is 0 to 89 seconds, it is regarded as 90 seconds for
operation. If the setting is outside the allowed range, it is
regarded other than 0 to 3600 seconds for operation.
• The waiting time for a start of online program change to the
standby system CPU module is checked according to the
SD1710 setting during online change of multiple blocks and
online change of batch of files for redundancy.
Explanation
• This register stores status of the redundant power supply
module (Q63RP and Q64RP) with input power off, in the
following bit pattern.
Input power OFF Input power OFF
detection status of detection status of
1
power supply 2 power supply 1
b15 b9 b8 b7 b1
to to
SD1780 to to
• When the main base unit is not the redundant power main
base unit (Q38RB), "0" is stored.
• When configuring multiple CPU, the status is stored to 1st
CPU module.
Set by
(When Set)
S
(Error)
S
(Initial)
/U
Set by
(When Set)
Each bit
1
0: Input power ON status/
No redundant power
b0
supply module
1: Input power OFF status
Main base unit
S
1st extension base
(Every END
:
processing)
7th extension base
Main base unit
1st extension base
:
7th extension base
APPENDICES
Corre-
Corre-
sponding
sponding
ACPU
CPU
D9
New QnPRH
Corre-
Corre-
sponding
sponding
ACPU
CPU
D9
*2
Qn(H)
*2
QnPH
New
QnPRH
*3
QnU
363
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