8 CONTROL SUB FUNCTIONS
8.4 Functions to Limit the Control
243
8
Hardware stroke limit function
In the "hardware stroke limit function", limit switches are set at the upper/lower limit of the physical moveable range, and the
control is stopped (by deceleration stop) by the input of a signal from the limit switch.
Damage to the machine can be prevented by stopping the control before the upper/lower limit of the physical moveable range
is reached.
The hardware stroke limit is able to use the following signals. (Page 424 [Pr.116] to [Pr.119] FLS/RLS/DOG/STOP signal
selection)
• External input signal of Simple Motion module
• External input signal of servo amplifier
• External input signal via CPU (buffer memory of Simple Motion module)
Control details
The following drawing shows the operation of the hardware stroke limit function.
■External input signal of Simple Motion module
■External input signal of servo amplifier
WARNING
• When the hardware stroke limit is required to be wired, ensure to wire it in the negative logic using b-contact. If it is set in positive logic using a-contact, a
serious accident may occur.
Servo amplifier
Simple Motion
module
Upper limitLower limit
Control range of Simple Motion module
Start
Start
Lower limit switch Upper limit switch
Mechanical stopper Mechanical stopper
Deceleration stop at lower
limit switch detection
Deceleration stop at upper
limit switch detection
Movement
direction
Movement
direction
RD77MS4
ERRRUN
AX
3
4
2
1
AX
Upper limitLower limit
Control range of Simple Motion module
Start
Start
Lower limit switch Upper limit switch
Mechanical stopper
Mechanical stopper
SSCNETµ(/H)
Movement
direction
Movement
direction
Deceleration stop at lower
limit switch detection
Deceleration stop at upper
limit switch detection
Simple Motion
module
RD77MS4
ERRRUN
AX
3
4
2
1
AX
Servo amplifier
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