Mitsubishi MELSEC iQ-F FX5 series Programming Manual page 472

• The following shows the areas of (d) and later used for the instructions (when Z0 to 13 and LZ0 to 4 are used).
ZPUSH K0 D0
(Save the whole range
of Z and LZ)
ZPUSH K2 D0
(Save the whole range
of LZ)
Precautions
• When a nesting structure is not adopted, clear (d) before executing the ZPUSH(P) instructions.
• When a nesting structure is adopted, clear (d) before executing the first ZPUSH(P) instructions.
• When the ZPOP(P) instructions are used to return the data of index registers, use the ZPOP(P) instructions corresponding
to the ZPUSH(P) instructions that were used for saving the data.
ZPUSH(P) (One setting data)  ZPOP(P) (One setting data)
ZPUSH(P) (Two setting data)  ZPOP(P) (Two setting data)
• Do not change the values of (d)+1 and (d)+2 because they are used by the system. Do not change the values of the Z and
LZ save types stored in the devices specified by (d) and later because they are used by the system.
• Secure the areas so that the save destination specified by (d) does not exceed the device range.
Operation error
Error code Description
(SD0/SD8067)
2820 The range of points used in (d) or later exceeds the range of the target device/label area.
3405 A value other than 0 to 2 is specified in (s).
When the number of index registers is 0, "1" is specified in (s).
When the number of long index registers is 0, "2" is specified in (s).
7 APPLICATION INSTRUCTION
470
7.9 Index register operation instruction
Number of times of batch-storage
(d)
(d)+1
Reserved by the system
(2 words)
(d)+2
Z0
(d)+3
Z1
(d)+4
Z13
(d)+16
(d)+17
LZ0
(d)+18
(d)+19
LZ1
(d)+20
(d)+25
LZ4
(d)+26
Z, LZ save type = 0
(d)+27
(d)+28
LZ0
(d)+29
(d)+36
LZ4
(d)+37
Z, LZ save type = 2
(d)+38
1st nesting
(25 words for one nesting)
2nd nesting
(11 words for two nesting)
3rd nesting