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8 CONTROL SUB FUNCTIONS
8.4 Functions to Limit the Control
■External input signal via CPU (buffer memory of Simple Motion module)
Wiring the hardware stroke limit
When using the hardware stroke limit function, wire the terminals of the Simple Motion module/servo amplifier upper/lower
limit stroke limit as shown in the following drawing. As for the 24 V DC power supply, the direction of current can be switched.
(When "[Pr.22] Input signal logic selection" is set to the initial value)
When using the hardware stroke limit function with the external input signal via CPU (buffer memory of Simple Motion
module), wiring differs depending on the input module.
*1 When "Servo amplifier" is set in "[Pr.116] FLS signal selection" to "[Pr.118] DOG signal selection" at MR-JE-B use, any errors or
warnings do not occur. However, the external input signal (upper/lower limit signal, near-point dog signal) cannot be operated.
Wire the limit switch installed in the direction to which "Current feed value" increases as upper limit switch and
the limit switch installed in the limit switch installed in the direction to which "Current feed value" decreases as
lower limit switch.
If inverting the install positions of upper/lower limit switches, hardware stroke limit function cannot be operated
properly. In addition, the servomotor does not stop.
Refer to each servo amplifier instruction manual for details about the "Rotation direction selection/travel
direction selection (PA14)".
Precautions during control
• If the machine is stopped outside the Simple Motion module control range (outside the upper/lower limit switches), or if
stopped by hardware stroke limit detection, the starting for the "home position return control", "major positioning control",
and "high-level positioning control" and the control mode switching cannot be executed. To carry out these types of control
again, return the workpiece to the Simple Motion module control range by a "JOG operation", "inching operation" or
"manual pulse generator operation".
• When "[Pr.22] Input signal logic selection" is set to the initial value, the Simple Motion module cannot carry out the
positioning control if FLS (limit switch for upper limit) is separated from DICOM or RLS (limit switch for lower limit) is
separated from DICOM (including when wiring is not carried out).
Upper limitLower limit
Control range of Simple Motion module
Start
Start
Lower limit switch
Upper limit switch
Mechanical stopper Mechanical stopper
Simple Motion module
Input module
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
Simple Motion module
FLS
RLS
COM
24 V DC
DI1
(FLS)
DICOM
24 V DC
DI2
(RLS)
Servo amplifier
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