6 Interface Between CNC And PLC
6 - 7
Table 6-2 C-bit Signals Description
Bit Number C-Bit Signal Description
C000 Machine Lock/Feed hold
C001 Reset
C002 Emergency stop
C003 Reserved
C004 Cycle start
C005 Program No. selection by INPUT key
C006 Single Block
C007 NC alarm & stop NC command
C008~C010 Reserved
C011 Program restart -1
C012~C013 Program restart from the previous program after jumping to other program
C014 Reserved
C015 Dryrun
C016~C019 Reserved
C020~C021 Cursor up / Cursor down command
C022~C023 Page up / Page down command
C024~C025 Reserved
C026 Option stop
C027 Option skip
C028 Speed deceleration selection for G31 Skip function
C029 Reserved
C030 Counter status (On/Off) command
C031 Ladder simulation
C032 M-code finish signal from PLC to CNC
C033 T-code finish signal from PLC to CNC
C034 S-code finish signal from PLC to CNC
C035 Reserved
C036 Round corner non-stop operation
C037~C055 Reserved
C056 MPG hand-wheel test mode
C057 Return to the last program block where execution was interrupted
C058 Program EDIT mode disabled
C059 MCM EDIT mode disabled
C060~C062 Reserved
C063 HOME execution command
C064~C065 HOME limit switch signal for X, Y-axis
C066~C079 Reserved
C080~C081 Set X, Y-axis work coordinate system
C082~C095 Reserved
C096~C097 Clear X, Y-axis program & machine coordinate to zero (0)
C098~C116 Reserved
C117 C117=0, Open loop circuit for spindle
C117=1, Closed loop circuit for spindle
C118~C119 Reserved
C120 Command code for program selection from external device
C121 Command code for spindle speed control (in %) from external I/O device
C122 Reserved
C123 Set work coordinate system (G54~G59)
C124 Reserved
C125 M, T, and S-code to be executed in synchronization
C126~C127 Reserved
C128~C129 To enable axial data input (X, Y) when in TEACH mode
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