Mitsubishi Electronics 13JW55 ユーザーズマニュアル

 

 

App. - 64

 

 

 
Appendix 8  Indexing 

In the Universal model QCPU (excludes Q00UJCPU), expanding the index register 

to 32 bits enables the indexing for all the file register areas. 

ZR0

ZR1

ZR32767

ZR32768

ZR4184063

SM400

DM0V K1042431

Z0

D0

ZR0Z0

M0V

Serial number access 
format file register

Conventional area 

to which indexing 

can be used

Area to which indexing can be 

used of Universal model QCPU

To index the serial number access format file 
register (ZR) with 32-bit, use the index register (Z).

 

 

A method for specifying index registers for 32-bit indexing can be selected from 

following two methods. 

 

• Specifying the index range used for 32-bit indexing 

• Specifying the 32-bit indexing using "ZZ" specification 

 

(1)  When specifying the index range used for 32-bit indexing 

 

(a)  Each index register can be set between -2147483648 and 2147483647. 

The following shows an example of indexing. 

X0

DMOV K40000

Z0

X0

MOV

ZR10Z0

D0

Stores 40000 in Z0.

Stores the data of
ZR10Z0 = ZR{10+40000}
= ZR40010 in D0.

Indexing

 

 

(b) Specification 

method 

For indexing with a 32-bit index register, specify the start number of an 

index register to be used on the Device tab of the PLC parameter setting 

screen in GX Works2. 

 

POINT 

 

 

When the start number of the index register used is changed on the Device tab 
of the PLC parameter setting screen, do not change the parameters only or do 
not write only the parameters into the programmable controller. Be sure to write 
the parameters into the programmable controller with the program. 
When the parameter is forced to be written into the programmable controller, 
an error of CAN'T EXE. PRG. occurs. (Error code: 2500)