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MELSEC-Q/QnA
3 CONFIGURATION OF INSTRUCTIONS
(2) Devices which can be index-modified
With the exception of the restrictions noted below, index modification can be used with devices
used with contacts, coils, basic instructions, and application instructions.
(a) Devices which cannot use index modification
Device Meaning
K, H 32-bit constant
E Floating decimal point data
$ Character-string data
, Bit designated for word device
FX, FY, FD Function devices
P Pointers used as labels
I Interrupt pointers used as labels
Z Index register
S Step relay
TR SFC transfer devices 1
BL SFC block devices 1
T, ST Value set for timer
C Value set for counter
(b) Devices with limits for use with index registers
Device Meaning Application Example
T
• Only Z0 and Z1 can be used for timer
contacts and coils
T0Z0
T1Z1
K100
C
• Only Z0 and Z1 can be used for counter
contacts and coils
C0Z1
C1Z0
K100
REMARKS
1) 1: SFC transfer devices and SFC block devices are devices for SFC use.
Refer to the QCPU (Q mode)/QnACPU Programming Manual (SFC) for information on
how to use these devices.
2) For timer and counter present values, there are no limits on index register numbers used.
T0Z4 K4Y30BCD
SM400
Present value of timer
X0
Set value of timer
(Index modification not possible)
T0
K100
SM400
Present value of counter
X1
Set value of counter
(Index modification not possible)
C100
K10
C100Z6 K2Y40BCD
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