Input Data - Mitsubishi Electric MELSEC-Q QnPHCPU Programming Manual

3 DATA USED FOR PROCESS CONTROL INSTRUCTIONS AND HOW TO
SPECIFY DATA
(3) Loop tag past value memory
(a) The loop tag past value memory is an area used by the QnPHCPU/QnPRHCPU system at
the time of process control instruction execution.
The user cannot write data to this memory during run.
If the user writes data to the loop tag past value memory during run, normal operation
cannot be performed.
(b) The loop tag past value memory is a 32-word area after the loop tag memory.
(c) At the start of the process control instruction, write "0" to the loop tag past value memory.

3.3.2 Input data

(1) Input data is variable data given to each process control instruction.
(2) The input data uses the block word of the block memory that stores the operation result of the
process control instruction executed previously.
Process control instruction
Input data
(3) The application of the input data changes depending on the used instruction. Refer to the
explanation section of the corresponding instruction.
REMARKS
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Operation result
S.IN
Block word
Block bit
*: Refer to Section 3.3.3 for the block memory.
Process control instruction
Operation result
S.PHPL
Input data Block word
Block bit
Transferred by user
MELSEC-Q
Block memory*
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