Details Of Output Signals (Cpu Module To Ld75) - Mitsubishi Electric MELSEC-L LD75P User Manual

*1 The BUSY signal turns ON even when position control of movement amount 0 is executed. However, since the ON time
is short, the ON status may not be detected in the program.
*2 "Positioning complete" of the LD75 refers to the point when the pulse output from LD75 is completed. Thus, even if the
LD75's positioning complete signal turns ON, the system may continue operation.
3.3.3

Details of output signals (CPU module to LD75)

The ON/OFF timing and conditions of the output signals are shown below.
Device
No.
Y0 PLC READY
Y4 Axis 1
Y5 Axis 2
Axis stop
Y6 Axis 3
Y7 Axis 4
Y8 Axis 1 Forward run JOG start
Y9 Axis 1 Reverse run JOG start
YA Axis 2 Forward run JOG start
YB Axis 2 Reverse run JOG start
YC Axis 3 Forward run JOG start
YD Axis 3 Reverse run JOG start
YE Axis 4 Forward run JOG start
YF Axis 4 Reverse run JOG start
Y10 Axis 1
Y11 Axis 2
Positioning start
Y12 Axis 3
Y13 Axis 4
Y14 Axis 1
Y15 Axis 2 Execution prohibition
Y16 Axis 3 flag
Y17 Axis 4
68
Signal name
OFF: PLC READY
OFF
ON: PLC READY ON
OFF: Axis stop not
requested
ON: Axis stop
requested
OFF: JOG not started
ON: JOG started
OFF: Positioning start
not requested
ON: Positioning start
requested
OFF: Not during
execution
prohibition
ON: During execution
prohibition
(a) This signal notifies the LD75 that the CPU module is normal.
• It is turned ON/OFF with the program.
• The PLC READY signal is turned ON during positioning control, OPR control,
JOG operation, inching operation, and manual pulse generator operation,
unless the system is under the test function of GX Works2.
(b) When parameters are changed, the PLC READY signal is turned OFF
depending on the parameter. ( Page 305, CHAPTER 7)
(c) The following processes are carried out when the PLC READY signal turns
from OFF to ON.
• The parameter setting range is checked.
• The LD75 READY signal [X0] turns ON.
(d) The following processes are carried out when the PLC READY signal turns
from ON to OFF. In these cases, the OFF time should be set to 100ms or
more.
• The LD75 READY signal [X0] turns OFF.
• The operating axis stops.
• The M code ON signal [X4 to X7] for each axis turns OFF, and "0" is stored in
"[Md.25] Valid M code".
(e) When parameters or positioning data (No. 1 to 600) are written from GX
Works2 or CPU module to the flash ROM, the PLC READY signal will turn
OFF.
• When the axis stop signal turns ON, the OPR control, positioning control, JOG
operation, inching operation and manual pulse generator operation will stop.
• By turning the axis stop signal ON during positioning operation, the positioning
operation will be "stopped".
• Whether to decelerate or suddenly stop can be selected with "[Pr.39] Stop group
3 sudden stop selection".
• During interpolation control of the positioning operation, if the axis stop signal of
any axis turns ON, all axes in the interpolation control will decelerate and stop.
• When the JOG start signal is ON, JOG operation will be carried out at the
"[Cd.17] JOG speed". When the JOG start signal turns OFF, the operation will
decelerate and stop.
• When inching movement amount is set, the designated movement amount is
output for one control cycle and then the operation stops.
• OPR operation or positioning operation is started.
• The positioning start signal is valid at the rising edge, and the operation is
started.
• When the positioning start signal turns ON during BUSY, the warning "Start
during operation" (warning code: 100) will occur.
• If the execution prohibition flag is ON when the positioning start signal turns ON,
positioning control does not start until the execution prohibition flag turns OFF.
(Pulse output not provided) Used with the "Pre-reading start function". (
Page 598, Section 12.7.7)
Details