Hardware Stroke Limit Function - Mitsubishi Electric RD77MS2 User Manual

Hardware stroke limit function

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.
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
Lower limit
Mechanical stopper
Deceleration stop at lower
limit switch detection
Lower limit switch
■External input signal of servo amplifier
Lower limit
Mechanical stopper
Deceleration stop at lower
limit switch detection
Lower limit switch
Control range of Simple Motion module
Movement
Start Start
direction
Deceleration stop at upper
limit switch detection
Upper limit switch
Control range of Simple Motion module
Movement
Start Start
direction
Deceleration stop at upper
limit switch detection
Upper limit switch
Upper limit
Movement Mechanical stopper
direction
Simple Motion
module
RD77MS4
RUN ERR
3 1
AX AX
4 2
Upper limit
Mechanical stopper
Movement
direction
Servo amplifier
SSCNETµ(/H)
Servo amplifier
Simple Motion
module
RD77MS4
RUN ERR
3 1
AX AX
4 2
8 CONTROL SUB FUNCTIONS
8.4 Functions to Limit the Control
8
243