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2 INSTRUCTION TABLES
2.5.21 Redundant system instructions (For Q4ARCPU)
Category
Operation
mode
setting
S.STMODE
during
CPU start
up
Operation
mode
setting
instructions
S.CGMODE
during
CPU
switch
Data
S.TRUCK
tracking
Buffer
memory
S.SPREF
batch
refresh
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Table 2.38 Redundant system instructions (For Q4ARCPU)
Symbol
S.STMODE S1 S2
S.CGMODE S
S.TRUCK
S
S.SPREF
S
Processing Details
• Designates the operation mode at (S1)
whether to clear the Q4ARCPU devices
before startup or not to clear them
before startup when the power supply is
turned on for CPU startup.
• Designates the operation mode at (S1)
whether to clear the Q4ARCPU devices
before startup or not to clear them
before startup when control is switched
from the control system to the standby
system.
• Conducts device memory tracking in
accordance with the parameter block
data contents stored in the area starting
from the device designated by (S)
during END processing.
• Batch reads/writes the contents of
special function module buffer memory
in accordance with the contents of
parameter block data stored in the area
starting from the device designated by
(S).
MELSEC-Q/QnA
Execution
Condition
9
10-2
7
10-4
6
10-6
6
10-10
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