Mitsubishi Electric MELDAS C6 Interface Manual page 244

B con-
Signal name
tact
—
MACRO INTERRUPT
[Function]
When the controller is ready for user macro interrupt, the program being in execution can be
interrupted, or other program can be executed after the former program has been executed, by
turning ON "Macro interrupt (UIT)".
[Operation]
When "Macro interrupt (UIT)" signal turns ON within time interval starting with M96 command and
ending with M97 command or reset, the program being in execution can be interrupted for
execution of other program.
"Macro interrupt (UIT)" signal becomes valid when:
(1) Memory or MDI is selected.
(2) Automatic operation is selected (signal STL is ON).
(3) Other user macro is not being executed.
(4) Parameter "user macro interrupt valid" is selected.
"Macro interrupt (UIT)" signal is accepted in "status trigger" method or "edge trigger" method, either
one of which can be selected by parameter.
(1) Status trigger method
While "Macro interrupt (UIT)" signal is ON, the signal can be accepted.
When M96 is used to make acceptable user macro interrupt, the inserted program is executed
when the signal (UIT) turns ON.
With the signal (UIT) kept turned ON, inserted program can be executed repeatedly.
(2) Edge trigger method
The signal (UIT) is accepted when its status changes from "OFF" to "ON" (i.e., with rise edge of
signal).
This method is advantageous when inserted program is executed only once.
<Command format>
M96 P_ H_ ;
M97 :
• • • • • • • • • • • • • • • • • •
Refer to the relevant "Programming Manual" for details on the user macro interrupt function such as
interrupt method and call method for when the "Macro interrupt (UIT)" signal is ON.
(Note 1) M96 and M97 can be changed to other M code by using a parameter.
(Note 2) User macro interrupt control M code is processed internally and not output to an external
source (PLC).
6. EXPLANATION OF INTERFACE SIGNALS
6.3 PLC Output Signals (Bit Type: Y***)
Signal
abbreviation
UIT
User macro interrupt valid
• • • • • • • • • • •
Interrupt sequence No.
Interrupt program No.
User macro interrupt invalid
1st system
Y725
6-3-47
2nd system 3rd system
Y805 Y8E5