External I/O Signal Logic Switching Function - Mitsubishi Electric MELSEC-LD77MS2 User Manual

14.5 External I/O signal logic switching function

Setting item
Input signal logic
Pr.22
selection
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.
This function switches the signal logic according to the following signals.
• External equipment connected to Simple Motion module
• 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 details
• Selection of logic of signals input from external
device to Simple Motion module
b0 Lower limit
b1 Upper limit
b2 Not used
b3 Stop signal
External
b4 command/
switching signal
b5 Not used
Near-point dog
b6
signal
b7 Not used
Manual pulse
generator input
b8
1
b9 to b15 Not used
0: Negative logic,
1: Positive logic
Set "0".
0: Negative logic,
1: Positive logic
0: Negative logic,
1: Positive logic
Set "0".
0: Negative logic,
1: Positive logic
Set "0".
0: Negative logic,
1: Positive logic
Set "0".
14 - 15
Chapter 14 Common Functions
Buffer memory address
Factory-
set initial
LD77MS2
value
LD77MS4
0 31+150n
LD77MS16
n: Axis No.-1