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Chapter 3    Specifications and Functions

 

3.3.3 Details of output signals (PLC CPU 

 QD77MS) 

The ON/OFF timing and conditions of the output signals are shown below. 

(1) QD77MS2/QD77MS4 

 

Device No. 

Signal name 

Details 

Y0 PLC 

READY 

OFF: 

 

PLC READY OFF 

ON: 

PLC READY ON 

(a) This signal notifies the Simple Motion module that the PLC CPU 

is normal.   

• It is turned ON/OFF with the sequence program. 
• The PLC READY signal is turned ON during positioning control, 

OPR control, JOG operation, inching operation, manual pulse 
generator operation and speed-torque control ,etc. unless the 
system is in the GX Works2 test function. 

(b) When the data (parameter etc.) are changed, this signal is turned 

OFF depending on the parameter (Refer to Chapter 7.). 

(c) The following processes are carried out when this signal turns 

from OFF to ON. 

• The parameter setting range is checked. 
• The READY signal [X0] turns ON. 

(d) The following processes are carried out when this signal turns 

from ON to OFF. 
In these cases, the OFF time should be set to 100ms or more. 

• The READY signal [X0] turns OFF. 
• The operating axis stops. 
• The M code ON signal [X4 to X7] for each axis turns OFF, and 

"0" is stored in "[Md.25] Valid M code". 

(e) When parameters or positioning data (No. 1 to 600) are written 

from the GX Works2 or PLC CPU to the flash ROM, this signal 
will turn OFF. 

Y1 

All axis servo ON 

OFF: 

Servo OFF 

ON: 

Servo ON 

• The servo for all the servo amplifiers connected to the Simple 

Motion module is turned ON or OFF. 

Y4 
Y5 
Y6 
Y7 

Axis 1 
Axis 2 
Axis 3 
Axis 4 

Axis stop 

OFF: 

Axis stop not 
requested 

ON: 

Axis stop requested

• When the axis stop signal turns ON, the OPR control, positioning 

control, JOG operation, inching operation, manual pulse generator 
operation and speed-torque control etc. will stop. 

• By turning the axis stop signal ON during positioning operation, the 

positioning operation will be "stopped". 

• Whether to decelerate stop or suddenly stop can be selected with 

"[Pr.39] Stop group 3 sudden stop selection". 

• During interpolation control of the positioning operation, if the axis 

stop signal of any axis turns ON, all axes in the interpolation control 
will decelerate and stop. 

Y8 
Y9 

YA 
YB 
YC 
YD 
YE 
YF 

Axis 1 
Axis 1 
Axis 2 
Axis 2 
Axis 3 
Axis 3 
Axis 4 
Axis 4 

Forward run JOG start 
Reverse run JOG start 
Forward run JOG start 
Reverse run JOG start 
Forward run JOG start 
Reverse run JOG start 
Forward run JOG start 
Reverse run JOG start 

OFF: 

JOG not started 

ON: 

JOG started 

• When the JOG start signal is ON, JOG operation will be carried out 

at the "[Cd.17] JOG speed". When the JOG start signal turns OFF, 
the operation will decelerate and stop. 

• When inching movement amount is set, the designated movement 

amount is output for one operation cycle and then the operation 
stops. 

Y10 
Y11 
Y12 
Y13 

Axis 1 
Axis 2 
Axis 3 
Axis 4 

Positioning start 

OFF: 

Positioning start not 
requested 

ON: 

Positioning start 
requested 

• OPR operation or positioning operation is started. 
• The positioning start signal is valid at the rising edge, and the 

operation is started. 

• When this signal turns ON during BUSY, the warning "Start during 

operation" (warning code: 100) will occur. 

Y14 
Y15 
Y16 
Y17 

Axis 1 
Axis 2 
Axis 3 
Axis 4 

Execution prohibition 
flag 

OFF:  

Not during execution 
prohibition 

ON:  

During execution 
prohibition 

• If the execution prohibition flag is ON when the positioning start 

signal turns ON, positioning control does not start until the 
execution prohibition flag turns OFF. 
Used with the "Pre-reading start function". (Refer to Section 
13.7.7.)