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1. PLC Development Environment Using GX Developer
1.6 PLC4B PLC Development Environment (M500) and Differences
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(2) Commands with the Format that Differs from that of the GX Developer
The device types and assignments have been reconsidered because the user PLC development
environment using the MELSEC PLC development tool has been supported in C64 series.
The format of conventional "commands used by inputting or outputting an accumulator (A0, A1)" is
changed so that the general word register can be designated with arguments without fixing by A0 or
A1 input or output because of the discontinuance of accumulator (A0, A1).
Format-changed commands are shown in "Table of format-changed command correspondence" as
below.
When some commands described in "Table of format-changed command correspondence" are
created with the GX Developer with the conventional command sign left as is, an error results and
creation cannot be carried out. Create the commands using the GX Developer command sign
described in the correspondence table.
Table of format-changed command correspondence
Original MELDAS Series
command
Format-changed command
Classification
Command
sign
Symbol
Command
sign
Symbol
Remarks
ROR
⎯[ ROR n ]
ROR
⎯[ ROR D n ]
RCR
⎯[ RCR n ]
RCR
⎯[ RCR D n ]
DROR
⎯[ DROR n ]
DROR
⎯[DROR D n ]
Right rotation
DRCR
⎯[ DRCR n ]
DRCR
⎯[ DRCR D n]
ROL
⎯[ ROL n ]
ROL
⎯[ ROL D n ]
RCL
⎯[ RCL n ]
RCL
⎯[ RCL D n ]
DROL
⎯[ DROL n ]
DROL
⎯[ DROL D n ]
Left rotation
DRCL
⎯[ DRCL n ]
DRCL
⎯[ DRCL D n ]
∗1
Search SER
⎯[ SER S1 S2 n ]
SER
⎯[ SER S1 S2 D n ] ∗2
Quantity of 1
SUM
⎯[ SUM S ]
SUM
⎯[ SUM S D ] ∗3
∗1 : D is the head No. of the rotation device (word 16-bit device)
∗2 : D is the head No. of the device that stores the search results (word bit device)
∗3 : D is the head No. of the device that stores the total No. of bits (word bit device)
(3) Commands that can be Used with the GX Developer, but cannot be Used by the C64 series
When commands that cannot be used by the C64 series are written from the GX Developer to the
C64 series, they are rewritten to "NOP" commands, and if they are run, an alarm will occur. (Note
that commands described in "Table of alternate command correspondence" are rewritten to the
corresponding C64 series commands.)
"Commands that can be used by the GX Developer, but cannot be used in the C64 series " are
defined by the following expression.
"Commands that can be used by the GX Developer, but cannot be used in the C64 series"
= "All commands described in the QnA Programming Instruction Manual"
- ("All commands described in the C64 series PLC Programming Instruction Manual"
+ "Table of alternate command correspondence"
+ " Table of format-changed command correspondence")
Refer to Appendix 2. MELSEC QnA Series command lists.