Mitsubishi Electric MELSEC-L02SCPU User Manual page 55

(3) Details of I/O signals
The following table lists and describes the I/O signals of the connector for LCPU external devices.
Category Signal name
Zero signal
(PG0)
Input common
External command signal
(CHG)
Drive unit ready signal
(READY)
Input
Near-point dog signal
(DOG)
Upper limit signal
(FLS)
Lower limit signal
(RLS)
Deviation counter clear signal
(CLEAR)
CW/PULSE/A phase output
(PULSE F)
Output
CCW/SIGN/B phase output
(PULSE R)
Output common
• The zero signal from the pulse generator is used to input the OP signal for performing
the machine OPR.
• This signal is also used to indicate the completion of the machine OPR that uses a
stopper method for the machine OPR method.
• This signal is detected at the leading edge.
Common line for the external command signals, drive unit ready signal, near-point dog
signal, upper limit signal and lower limit signal
Used to input control switching signals in speed/position switching control.
• This signal turns on when the drive unit is normal and able to accept pulses.
• The LCPU checks this signal and if the drive unit is not ready, it turns on the Axis 1 OPR
request (SM1842).
• This signal turns off if the drive unit is inoperable, like when the control power supply of
the drive unit failed.
• If this signal is turned off during positioning, the system stops. The system does not start
even if this signal is turned on again.
• When this signal turns off, the Axis 1 OPR completion (SM1843) also turns off.
• If this signal is not selected for the input signal function selection, the signal is regarded
as being on.
• This signal is used to detect the near-point dog during machine OPR. The near-point
dog signal is detected at the leading edge.
• The signal is input from the limit switch installed at the upper limit position of the stroke.
• When this signal turns off, positioning stops.
• This signal defines the upper limit which is used to find the near-point dog when the
OPR retry function is enabled.
• If this signal is not selected for the input signal function selection, the signal is regarded
as being on.
• The signal is input from the limit switch installed at the lower limit position of the stroke.
• When this signal turns off, positioning stops.
• This signal defines the lower limit which is used to find the near-point dog when the OPR
retry function is enabled.
• If this signal is not selected for the input signal function selection, the signal is regarded
as being on.
This signal is output during machine OPR. (Count 2 is excluded.)
For the drive unit, use a model capable of resetting the internal deviation counter droop
pulse amount when the LCPU turns this signal on.
These signals are output as positioning pulses with pulse code to the drive unit.
Common line for the deviation counter clear signal, CW/PULSE/phase A outputs and
CCW/SIGN/phase B outputs.
CHAPTER 7 POSITIONING FUNCTION
Description
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