Mitsubishi Electric MELSEC iQ-R-R00CPU - Combination of Index Modification; Precautions

21 DEVICES
21.8 Index Register (Z/LZ)
355
21
Combination of index modification
This section describes the combination of index modification.
Modification order for the device specification and index modification
According to the priority order shown below, the device specification (digit specification, bit specification, indirect specification)
and index modification can be applied. However, some word devices may not follow the priority order shown below.
Specification method combined with device specification
The device targeted for specification is modified in order of: 1st modification, 2nd modification and then 3rd modification.
Besides, the following contents can be used only for the device for which the 1st modification can be applied. (For example,
index modification + digit specification is impossible for the function input (FX).)
Precautions
This section describes the precautions on using index modification.
Index modification between the FOR and NEXT instructions
Between the FOR instruction and the NEXT instruction, pulse output is provided through the edge relay (V). However, pulse
output by the PLS, PLF, or pulse conversion (P) instruction is not available ( Page 337 Edge relay (V))
Index modification by the CALL instruction
In the CALL instruction, pulse output is provided through the edge relay (V). However, pulse output by the PLS, PLF, or pulse
conversion (P) instruction is not available ( Page 337 Edge relay (V))
Device range check for index modification
For details on the device range check when index modification is performed, refer to the following.
 MELSEC iQ-R Programming Manual (CPU Module Instructions, Standard Functions/Function Blocks)
Order of priority When the device targeted for the device specification
and index modification is the bit device
When the device targeted for the device specification
and index modification is the word device
High


Low
1: Index modification
2: Digit specification
1: Index modification
2: Indirect specification
3: Bit specification
Device targeted for
specification
1st modification 2nd modification 3rd modification Example
Bit device Index modification Digit specification  K4M100Z2
Word device Index modification Bit specification  D10Z2.0
Index modification Indirect Specification  @D10Z2
Bit specification Index modification  D10.8Z2
Indirect Specification Bit specification  @D10.8
Index modification Indirect Specification Bit specification @D10Z2.8
Indirect Specification Bit specification Index modification @D10.8Z2