6 Before Starting Positioning Operation
6.4 Handling the Forward Limit and Reverse Limit
36
FX
3U
-1PG User's Manual
6.4
Handling the Forward Limit and Reverse Limit
6.4.1
Handling the forward limit and reverse limit
The FX
3U
-1PG does not have a terminal for connecting the forward or reverse limit switch. Connect the limit
switch to the PLC and turn on/off the forward limit (BFM#25 b2) or the reverse limit (BFM#25 b3) at each
input.
Set the forward/reverse limit switches at the servo amplifier side as well as the PLC side for safety. At this
time, the limit switch at the PLC side reacts a little earlier than the limit switch at the servo amplifier side.
Point
• The stepping motor driver does not have terminals for connecting limit switches. Connect limit switches to
the PLC.
• Do not use the forward limit/reverse limit for any purposes other than limiting.
6.4.2
Operations at forward limit/reverse limit
Operations when the forward limit/reverse limit is turned on change depending on the setting of the limit
deceleration mode (BFM#3 b11/BFM#37 b11).
• Operation when the limit deceleration mode is OFF (Refer to Fig. 1 below.)
When the forward limit/reverse limit in the operating direction turns on during operation, the forward pulse/
reverse pulse is immediately stopped, and the CLR signal is output. (The output pulse width of the CLR
signal is 20 ms.)
• Operation when the limit deceleration mode is ON (Refer to Fig. 2 below.)
When the forward limit/reverse limit in the operating direction turns on during operation, the operation
decelerates and stops. The CLR signal is not output. In addition, at this time, the acceleration/deceleration
time (BFM#15) or the deceleration time (BFM#52) is applied for the deceleration time.
Reverse limit
(Servo amplifier side)
Forward limit
(PLC side)
Servo motor
Reverse
Forward
Reverse limit
(PLC side)
Forward limit
(Servo amplifier side)
Speed
Reverse limit
(PLC side)
Forward limit
(PLC side)
Motor
Reverse
Forward
2)
1)
Maximum speed
Operation speed
Position
1-speed positioning
operation start
(BFM#25 b8)
Forward limit
(BFM#25 b2)
Error flag
(BFM#28 b7)
OFF
ON
OFF
ON
Acceleration/deceleration time
(Deceleration time)
ON
OFF
Содержание FX3U-1PG
Страница 1: ...FX3U 1PG USER S MANUAL ...
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Страница 6: ...Safety Precautions Read these precautions before use 4 MEMO ...
Страница 142: ...Appendix C Differences with FX2N 1PG Appendix C 3 Differences in Operation 136 FX3U 1PG User s Manual MEMO ...
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