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MELSEC-Q
7 FUNCTION
The settings for high speed I/O refresh and high speed buffer transfer are as follows.
Item Sub Item Contents Restrictions
Number of
Settings
Start (X/Y)
Head device No.
(X0 to XFF0/Y0 to YFF0)
High speed I/O
refresh setting
Points
Number of transferred bits
(16 to 4096)
I/O and intelligent function
modules
Specify multiples of 16
only.
1
Up to 6 points for
X input and Y
output,
respectively.
Starting I/O No.
Head I/O address / 10
H
(0 to FF
H
)
Intelligent function
modules only 2
Buffer memory
start
Head address (0 to FFFF
H
)
Points
Number of transferred bits
(1, 2 to FFFE
H
)
Intelligent function
modules only
Specify even addresses
and even words only
3
High speed
buffer transfer
setting
PLC side
device start
Head device No. D, W, R, ZR only
Up to 6 points for
read and write,
respectively.
1: Only multiples of 16 can be set for both the head device No. and the number of transferred bits.
2: Since the QA base cannot be connected, the A/QnA series intelligent function modules are not the target.
(When the QA base is connected, "PARAMETER ERROR (3006)" is detected.)
"PARAMETER ERROR (3006)" is also detected if an error occurs in intelligent function module mounting check or
buffer memory capacity check.
3: Only when the specified number of transferred words is 1, an odd address can be specified.
(2) This function's execution requires both the EI instruction is in execution, and I49 is
not masked by the IMASK instruction. By default, I49 is not masked by the
IMASK instruction.
Executability of high speed interrupt (
: Executable, : Inexecutable)
Conditions High speed interrupt program
High speed I/O refresh
High speed buffer transfer
IMASK instruction (I49 unmasked)
EI instruction
in execution
IMASK instruction (I49 masked)
DI instruction
in execution
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