Mitsubishi MELSEC-A A1SD71-S2 User Manual page 79

3. SPECIFICATIONS
MELSEC-A
Positioning start (Y20, Y21, Y22)
Become valid at the leading edge of this signal.
Zero return start (Y23, Y24)
Become valid at the leading edge of this signal.
Stop (Y25, Y26)
One of these signals being ON stops zero return and positioning and JOG
operations.
(If these signals are turned ON during BUSY, the M code ON signal goes
OFF.)
After an operation stops, operations can be restarted by a positioning
start signal. (Section 6.3.10 gives details about concrete examples.)
JOG operation (Y27 to Y2A)
When these signals go ON, a JOG operation is executed. Operations are
decelerated and stopped automatically by turning OFF this signal.
M code OFF (Y2B, Y2C)
The leading edge of these signals makes the
M
code ON signal go OFF.
PC ready signal (Y2D)
Sends the correct PC CPU operation to the AlSD71.
At the start of positioning, zero return jog operations (other than those
carried out in a peripheral device or AD71TU) this signal must be ON.
However,
if
one axis is in BUSY in the test mode when using a peripheral
device, the leading edge of the PC ready signal is ignored.
Then, when both axes are not in BUSY, execution takes place.
1) Parameter checking and initialization
2) Zero return data check
3) Zero return request ON, AlSD71 ready signal ON
The following time
(t)
the signal of 3) after a PC ready signal goes ON
must go ON to process 1) and 2).
PC ready signal (Y2D)
AlSD71 ready signal (X1 1 )
Zero return request signals (X16 and X17)
I
If
the PC ready signal goes OFF when AlSD71 is BUSY, positioning is
stopped. Then, the
M
code ON signal goes OFF, and the
M
code is
cleared. However, even if the PC ready signal goes OFF in BUSY when
using a peripheral device or AD71TU in the test mode, positioning does
not stop.
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