Precautions For Replacement Of The Melsap-Ii With The Melsap3; Starting Sfc Program; Block Information (Sfc Information Device) - Mitsubishi Electric MELSEC Q Series Handbook

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REPLACEMENT OF PROGRAM

7.6 Precautions for Replacement of the MELSAP-II with the MELSAP3

The basic operation of the MELSAP3 is the same as the MELSAP-II, but the specifications are partially
different.
This section provides the precautions for the replacement.

7.6.1 Starting SFC program

The SFC program can be started by using the special relay for starting/stopping the SFC program. That
special replay for the AnSCPU (M9101) is replaced with the special relay for the QCPU (SM321) upon
converting from the AnSCPU to QCPU. The specifications of the special relay for starting or stopping
SFC program partially differ between the AnSCPU and QCPU.
MELSAP-II (M9101)
Switches on and off with user
operation.

7.6.2 Block information (SFC information device)

The MELSAP-II 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).
[START]
Switching the block active bit on,
executes forced start.
Block START/
[STOP]
STOP methods
Switching the block clear bit on,
stops the block also switching from
on to off executes forced stop.
The number of
Reads the number of active steps
active steps and
in the corresponding block and
active step
active step numbers.
numbers reading
Specifications
MELSAP3 (SM321)
SFC program starts up at default, since
system is automatically turned on.
Specifications
MELSAP-II
[START]
Switching the block START/STOP
bit on starts the concerned block
forcibly.
[STOP]
Switching the block START/STOP
bit off stops the concerned block
forcibly.
Reads only the number of active
steps in the corresponding block.
Precautions for replacement
When starting/stopping the SFC program
according to user conditions, turn the SM321 to
on/off with program.
Precautions for replacement
MELSAP3
[START]
Adjusting program is not required
when replacing the SFC program of
the AnSCPU with the QCPU, since
in that case, the "Block active bit" is
replaced with the "Block START/
STOP bit".
[STOP]
Add the program that resets the
"Block START/STOP bit" to the
"Block clear bit".
Delete the program that switches
the "Block clear bit "on/off.
To read the active step numbers,
use the "Active step batch readout
instructions (MOV, DMOV,
BMOV)".
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