Mitsubishi Electric MELDAS C6 Interface Manual page 232

B con-
Signal name
tact
—
SINGLE BLOCK
[Function]
Machining program can be executed block by block in automatic operation.
[Operation]
(1) When single block signal (SBK) turns ON, operation of controller is as follows:
• During automatic operation
After the block in execution has been completed, automatic operation stops. To start execution
of the next block, "Auto operation "start" command" (ST) must be turned ON to OFF.
• There will be no operation when automatic operation is not being executed but if automatic
operation is started with SBK signal ON, one block will be executed and then will stop. This
allows the commanded program to be executed one block at a time.
(2) If SBK is ON at the end of a block, operation will normally stop immediately. However, in the
following case, operation will continue to where stopping is possible, and then will stop.
• During cycle operation such as a fixed cycle. The block where single block is being received
will differ according to each cycle. Refer to the cycle sections in the Programming Manual.
<Example of operation pattern>
Single block signal (SBK)
"
Auto operation start
command signal (ST)
Axis motion block
B con-
Signal name
tact
*
BLOCK START INTERLOCK
[Function]
This signal prohibits start of the next block in automatic operation (memory or MDI).
[Operation]
While the signal (*BSL) is OFF, execution of the next block may not be started in automatic
operation. When the signal is given during execution of a block, the execution of the block
continues until it is completed. Since the signal does not cause stop or suspension of automatic
operation, execution of program starts when the *BSL signal turns ON.
(Note 1) This signal is valid to all blocks including blocks internally generated in controller by
canned cycle, etc.
(Note 2) In C6/C64, the signal (*BSL) is ON when the power is turned ON. When the signal is not
used, programming on the PLC is not required for this signal.
[Related signal]
(1) Cutting block start interlock (*CSL: Y714)
6. EXPLANATION OF INTERFACE SIGNALS
6.3 PLC Output Signals (Bit Type: Y***)
Signal
abbreviation
SBK
"
G00 X100 ...
SBK turns on at start
(INVALID)
Signal
abbreviation
BSL
1st system
Y712
G01 Y100 ...
SBK switches during axis motion
(VALID)
1st system
Y713
6-3-35
2nd system 3rd system
Y7F2 Y8D2
G01 X10 Y20 ...
SBK turns on after completion
of block
(VALID)
2nd system 3rd system
Y7F3 Y8D3