APP -7 APP -7
PPENDICES
MELSEC-Q
APPENDIX 2 Restrictions and Alternative Method of the Basic Model
QCPU and Universal Model QCPU
This section explains the restrictions on use of a SFC program with the Basic model QCPU.
(1) Function comparison
Item
Basic Mode QCPU
Universal model QCPU
High Performance Model QCPU
Process CPU
Redundant CPU
Replacement
Method
Step transition watchdog timer Not provided Provided Appendix 2.1
Operation mode at block
double START
Not provided
(Fixed to "WAIT")
Provided
Operation mode for
transition to active step
(at step double START)
Not provided
(Fixed to "TRANSFER")
Provided
SFC
operation
mode setting
Periodic execution block
setting
Not provided Provided Appendix 2.2
aTRn
&aTRn
laTRn
bTRn
&bTRn
lbTRn
aBLm/TRn
&aBLm/TRn
laBLm/TRn
bBLm/TRn
&bBLm/TRn
Forced
transition
check
instruction
lbBLm/TRn
Not provided Provided
Active step
change
instruction
SCHG (D) Not provided Provided Appendix 2.4
sTRn
sBLm/TRn
rTRn
Transition
control
instruction
rBLm/TRn
Not provided Provided Appendix 2.3
SFC control
instruction
Block
switching
instruction
BRSET (S) Not provided Provided
SFC program for program execution
management
Not provided Provided
Program execution type setting
Not provided *1
(Fixed to "scan execution type")
Provided
*1: The Universal model QCPU can set the execution type of a program.