Specifications
MELSAP-
ΙΙ
MELSAP3
Precautions for replacement
Item
[START]
The program does not need adjustments
when a SFC program for ACPU is
converted to QCPU because
the "Block active bit" is replaced with
"Block START/STOP" bit.
[STOP]
The "Block clear bit" resets the "Block
START/STOP bit".
Add the SFC control instruction
"RST BLm" to the program.
Delete the program that switches
the "Block clear bit" on/off.
[START]
Switching on the block
START/STOP bit forcibly
starts the corresponding
block.
[STOP]
Switching off the block
START/STOP forcibly stops
the corresponding block.
[START]
Switching the block active bit
on executes forced start.
[STOP]
Switching on the block clear
bit stops the block and
switching it off executes
forced stop.
Block START/
STOP methods
To read the active step numbers,
use the "Active step batch readout
instructions (MOV, DMOV, BMOV)".
Reads only the number of active
steps in the corresponding block.
Reads the number of active
steps in the corresponding
block and active step numbers.
The number of
active steps
and active step
numbers reading
Specifications
MELSAP-
ΙΙ
(M9101)
MELSAP3 (M321)
Precautions for replacement
When starting/stopping the SFC program
according to user conditions, operations
such as turning SM321 on/off must be
handled in the program.
SFC program starts up at default,
since system is automatically turned
on.
Switches on and off with user
operation.
* For detail operation instructions, refer to the following manual.
Transition from MELSEC-A/QnA(Large Type)Series to Q Series Handbook(Fundamentals)(L-08043ENG)
[7.7.10 Setting method when multiple sequence programs are created]
The basic operation of the MELSAP3 is the same as the MELSAP-
ΙΙ
, but the specifications are partially
different.
This section provides the precautions for the replacement.
(1) Starting SFC program
The SFC program can be started by using the special relay for starting/stopping the SFC program.
The special relay used for starting/stopping SFC programs changes according to the programmable
controller type.
ACPU: M9101 -> QCPU: SM321
Please take the precaution listed below because the specifications of the special relays are different for
each CPU.
(2) Block information (SFC information device)
The MELSAP-
ΙΙ
and MELSAP3 have different method of executing the "Block START/STOP" and
"Reading of the number of active steps and active step numbers" with block information (SFC
information device).
Procedure 2: Program settings in GX Developer
When SFC programs have been created as ACPU program file, they are replaced with the following 2
programs.
• Ladder instructions: MAIN
• SFC programs: MAIN-SFC
To execute multiple programs, such as "MAIN" and "MAIN-SFC", go to "Program" found in "Parameter" of PLC
to set the program name, execution type, and the order of execution during each scan.
(2) Precautions for replacing MELSAP-
ΙΙ
with MELSAP3
(Program file name after changing programmable controller type)
(Program settings window)
149
7.4 Utilize SFC programs (Replace MELSAP-
ΙΙ
with MELSAP3)
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Содержание Artisan MELSEC-A
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