Mitsubishi Electric A173UHCPU Programming Manual page 43

3. POSITIONING SIGNAL
(10) Zeroing request signal (M2409+20n)
This signal comes ON when it is necessary to confirm the home position
address when the power is switched on or during positioning control.
(a) When not using an absolute value system
1) The zeroing request signal comes ON in the following cases:
• When the power is switched on, or the servo system CPU is reset.
• During a zeroing operation.
2) The zeroing request signal goes OFF when the zeroing operation is
completed.
(b) When using an absolute value system
1) The zeroing request signal comes on in the following cases:
• During a zeroing operation.
• When a backup data (reference value) sum check error occurs (when
the power is switched on).
2) The zeroing request signal goes OFF when the zeroing operation is
completed.
(11) Zeroing completed signal (M2410+20n)
(a) The zeroing completed signal comes ON when the execution of a zeroing
operation in accordance with a servo program has been completed
normally.
(b) It goes OFF when positioning is started, when JOG operation is started, or
when manual pulse generator operation is started.
(c) If an attempt is made to execute a proximity dog zeroing while the zeroing
completed signal is ON, the "ZERO RETURN START" error occurs,
making it impossible to start the zeroing.
(12) FLS signal (M2411+20n)
(a) FLS signal is controlled by the ON/OFF status of the upper stroke end limit
switch input (FLS) to the A278LX or A172SENC from an external source.
• Upper stroke end limit switch input OFF ...... FLS signal : ON
• Upper stroke end limit switch input ON ........ FLS signal : OFF
(b) The status of the upper stroke end limit switch input (FLS) when the FLS
signal is ON/OFF is indicated in the figure below.
FLS signal: ON
A278LX or A172SENC
FLS
FLS
COM
3 − 12
FLS signal: OFF
A278LX or A172SENC
FLS
FLS
COM