6 Interface Between CNC And PLC
6 - 11
When bit C006 = 1, the current execution is in SINGLE mode. Pre CYCST to
execute. If AUTO and SINGLE modes are selected at the same time, the priority of
SINGLE mode is higher than AUTO mode.
While in SINGLE mode, one block of data will be read from the memory for
execution if a cycle start signal is entered. Operation can be changed to MDI or JOG
by the mode selection signal under single block state. Fig 6-8 is a time chart for
SINGLE block execution.
Fig 6-3 Time Chart for Single Block Execution
• NC Alarm (C007)
C007 = 1 (high), NC alarm is ON.
C007 = 0 (low), NC alarm is OFF.
Bit C007=1 to inform the CNC unit a machine problem has been detected. When the
external device encounters any trouble, such as spindle servo alarm, these alarm
signals can be used, through input points, to inform the control unit to stop execution
by setting C007 high (1). LCD screen displays ERROR 37 NC ALARM. Resolve the
problem, RESET before restart the program.
• Program Restart-1 (C011)
C011 = 1 (high), Program Restart mode ON.
C011 = 0 (low), Program Restart mode OFF.
If you interrupt the program execution by pressing RESET or Emergence-stop, you
can set C011=1 to restart the execution from the program block where the program
was interrupted. HUST H2N does not provide this function key on the keyboard and
it must be processed through PLC.
Follow the steps below to restart the interrupted program:
1. Press RESET. Use MPG to move tool away. If the interruption was caused by
Em-stop or servo alarm (Error 2), execute HOME then RESET.
2. Press user installed [Restart] key to set C011 = 1 in PLC as follow.
Single Mode
Auto Mode
Continue Execution
BLK2BLK1
off
off
off
on
on
on on
off
Cycle Start
C004
Single Mode
C006
Auto Mode
C006 off
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