3 CONFIGURATION OF INSTRUCTIONS
3.3 Indexing
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3
■Device that indexing can be used
With the exception of the restrictions noted below, indexing can be used with devices used with contacts, coils, basic
instructions, and application instructions.
• Devices to which indexing cannot be used
*1 SFC transfer devices and SFC block devices are devices for SFC use.
Refer to the manual below for how to use these devices.
MELSEC-Q/L/QnA Programming Manual (SFC)
*2 For the High-speed Universal model QCPU, the SFC block device (BL) and step relay (S) can be modified using indices within the
following range.
• Devices with limits for use with index registers
*3
*3 Universal model high speed type QCPU is excluded.
For timer and counter present values, there are no limits on index register numbers used.
Device Description
E Floating decimal point data
$ Character string data
. Word device bit designation
FX, FY, FD Function devices
P Pointers used as labels
I Interrupt pointers used as labels
Z Index register
S Step relay
*2
TR SFC transfer devices
*1
BL SFC block device
*1*2
• For the SFC block device (BL), the range is BL0 to BL319.
• For the step relay (S), the range is specified in the device settings using parameters.
Note that if a step relay (S) in the SFC block is specified, index modification can be specified within the range of S0 to S511.
Device Description Application example
T, ST • Only Z0 and Z1 can be used for timer contacts and coils.
C • Only Z0 and Z1 can be used for counter contacts and coils.
SM400
Present value of timer
X0
Value set for timer
T0
K100
T0Z4 K4Y30
BCD
SM400
Present value of counter
X1
Value set for counter
C100
K10
C100Z6 K2Y40
BCD
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