Mitsubishi Electric MELSEC-Q/L Programming Manual page 95

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Table of Contents

■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.

• 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.

• Devices with limits for use with index registers

• Only Z0 and Z1 can be used for timer contacts and coils.

• Only Z0 and Z1 can be used for counter contacts and coils.

*3 Universal model high speed type QCPU is excluded.

For timer and counter present values, there are no limits on index register numbers used.

Floating decimal point data

Character string data

Word device bit designation

Function devices

Pointers used as labels

Interrupt pointers used as labels

Index register

SFC transfer devices

SFC block device

Application example

Value set for timer

Present value of timer

Value set for counter

Present value of counter

3 CONFIGURATION OF INSTRUCTIONS

3.3 Indexing