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14 - 14 

Chapter 14  Common Functions

 

14.5 External I/O signal logic switching function 

This function switches the signal logic according to the following signals. 
• External equipment connected to Simple Motion module 
• [Cd.44] External input signal operation device 
• External input signal of servo amplifier (upper/lower limit switch, near-point dog) 
 
For the system in which b-contact, upper limit switch, and lower limit switch are not 
used, the parameter logic setting can be controlled without wiring if it is changed to a 
"positive logic". 
When the upper limit switch, and lower limit switch are used, ensure to use them with 
negative logic (b-contact). 

 

The details shown below explain about the "External I/O signal logic switching 
function". 
[1] Parameter setting details 
[2] Precautions on parameter setting 

 

[1]  Parameter setting details 

To use the "External I/O signal logic switching function", set the parameters 
shown in the following table. 

 

Setting item 

Setting details 

Factory-

set initial 

value 

Buffer memory address 

QD77MS2 
QD77MS4 

QD77MS16

[Pr.22] 

Input signal logic 
selection 

• Selection of logic of signals input from external 

device to Simple Motion module 

0 31+150n 

b0  

Lower limit 

0: Negative logic, 
1: Positive logic

b1  

Upper limit 

b2 

Not used 

Set "0". 

b3 Stop 

signal 

0: Negative logic, 
1: Positive logic

b4 

External 
command/ 
switching signal

0: Negative logic, 
1: Positive logic

b5 

Not used 

Set "0". 

b6  

Near-point dog
signal 

0: Negative logic, 
1: Positive logic

b7 

Not used 

Set "0". 

b8 

Manual pulse 
generator input

1 

0: Negative logic, 
1: Positive logic

b9 to b15  Not used 

Set "0". 

n: Axis No.-1 

 

1: Only the value specified against the axis 1 is valid for the logic selection of manual pulse generator input (b8). 
: Refer to Section 5.2 "List of parameters" for the information on detail settings.