Instructions That May Need A Replacement After Conversion From Qnascpu To Qcpu - Mitsubishi Electric MELSEC Q Series Handbook

7
REPLACEMENT OF PROGRAM
7.2.5 Instructions that may need a replacement after conversion from QnASCPU to
QCPU
Some instructions are not automatically converted upon the replacement of the QnASCPU with the
QCPU.
The following table shows the instructions that are not automatically converted and their measures.
Reviewing the program is recommended.
Instruction type
Index modification of entire
ladder
Modification value
specification in index
modification of entire ladder
Print ASCII code instruction
Application
Print comment instruction
instruction
Special format failure checks
instruction
Format change instruction for
CHK instruction
Program low-speed
execution registration
instruction
Program execution status
check instruction
Display instruction
Status latch instruction
Sampling trace instruction
Application
instruction
Program trace instruction
Other instructions
PID control instruction
Special function modules instruction
Example: G. INPUT, G. PRN, etc.
*1 For details, refer to the following.
FA-A-0068 Precautions for replacing A/QnA (large type) series CPU with Universal model QCPU
Substitute A/QnA (Large Type) series CPU with AnS/QnAS (Small Size) series CPU.
QnASCPU
instruction
IX (Counter Measure)
Review the program and change manually.
(Supplement)
Change candidate instruction:

IXEND [IX] [ZPUSH]
Replace the IX instruction with the ZPUSH instruction and set the contents
of index modification table to index register.

[IXEND] [ZP.P]
IXDEV (Counter Measure)
Change the program so that the device offset values specified the IXSET
instruction are directly set to the index modification table using the MOV
IXSET
*1
instruction.
PR (Counter Measures)
PRC Replace the instruction by using an alternative program.
CHKST
CHK (Counter Measure)
CHKCIR
Replace the instruction by using an alternative program.
CHKEND
(Counter Measure)
• Use the PSCAN instruction instead of this instruction when low-speed
execution type programs are replaced with scan execution type
PLOW
programs.
• No instruction can be used if low-speed execution type programs are
replaced with fixed scan execution type programs.
(Counter Measure)
Check a program execution status on the Program monitor list screen of GX
PCHK
Works2. For details, refer to the QCPU User's Manual
(Function Explanation, Program Fundamentals).
LED (Counter Measure)
Setting an external display is recommended since the QCPU does not have
LEDC
the LED display function.
SLT
(Counter Measure)
There is no alternative action.
SLTR
STRA (Counter Measure)
Review the program and change manually.
(Supplement)
STRAR Change candidate instructions:
[STRA]  [TRACE] instruction
[STRAR]  [TRACER] instruction
PTRA
(Counter Measure)
PTRAR
There is no alternative action.
PTRAEXE
(Counter Measure)
Review the program and change manually. (Use the ATA card as a memory
EROMWR card.)
(Supplement)
Change candidate instruction: [EROMWR]  [FWRITE] instruction
(Counter Measure)
PID57
There is no alternative action.
G (P). [Instruction (Counter Measure)
name] Reprogram for the special function modules to use with the QCPU.
Corrective action
*1
*1
*1
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