General, Appearance, Front view – Panasonic WJ-MPS850 User Manual
Page 2: Rear view, Qw e r, Ty o i u
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General
The CPU Switch Unit is designed to switch over the
redundant (Duplicate) CPU system, automatically or
manually for maintenance reasons. This unit will always
diagnose both CPUs condition and judge which CPU
must be active. Diagnostic tables and judgment logic
are designed with flexible architecture which makes it
possible to customize it, depending on the level of
security requested by the user.
If this unit decides on a CPU change over, it must first
deactivate the previous CPU, and wake up the standby
CPU to be active later. Therefore this unit has a CPU
reset function and can restart the CPU in the standby
mode. Also, this unit will indicate the target CPU to be
active or on standby. Even if this unit is defective or
powered off, it can transmit the mode indications (the
active mode or standby mode) to the CPU, because of
the relay parts which are used for the interface with the
CPU.
And this unit has a status display with LED indications,
so a maintenance engineer will easily understand the
CPU condition, which CPU is active, and etc.
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Appearance
OPERATE
CPU Switch Unit WJ-MPS
CPU DIAGNOSTIC-A
A
RESET
CPU DIAGNOSTIC-B
B
RESET
B
A
AUTO
CPU MODE INDICATION
q
w
e
r
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Front View
t
y
o
i
u
AC IN
MAIN CPU-STANDBY
3
2
1
DATA 1
DATA 2
DATA 3
DATA 4
DATA 5
DATA 6
DATA 7
DATA 8
DATA 9
DATA 10
DATA 11
DATA 12
PUSH
FUSE
TARGET
DATA 1
MAIN CPU-ACT
CAITION
PERIPHERAL INTERFACE (RS-232C)
SYSTEM CONTROLLER (RS-485)
DIAGNOSTIC
INPUT
DATA 1
DATA 2
DATA 2
DATA 3
DATA 3
DATA 4
DATA 4
DATA 5
DATA 5
DATA 6
DATA 6
DATA 7
DATA 7
DATA 8
DATA 8
DATA 9
DATA 9
DATA 10
DATA 10
DATA 11
DATA 11
DATA 12
DATA 12
3
2
1
3
2
1
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Rear View