Mitsubishi QD75M1 User Manual

13 - 7
MELSEC-Q
13 COMMON FUNCTIONS
13.4 External I/O signal logic switching function
This function switches the signal logic according to the external equipment connected
to the QD75.
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
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.
Buffer memory address
Setting item Setting details
Factory-set
initial value
Axis 1 Axis 2 Axis 3 Axis 4
• Selection of logic of signals input from external source to
QD75
b0 Lower limit
b1 Upper limit
0: Negative logic,
1: Positive logic
b2 Not used Set "0".
b3 Stop signal
b4
External
command
0: Negative logic,
1: Positive logic
b5 Not used Set "0".
b6 Near-point signal
0: Negative logic,
1: Positive logic
b7 Not used Set "0".
b8
Manual pulse
generator input
0: Negative logic,
1: Positive logic
Pr.22
Input signal logic
selection
b9 to b15 Not used Set "0".
0 31 181 331 481
Refer to section 5.2 "List of parameters" for the information on detail settings.
[2] Precautions on parameter setting
(1) The I/O signal logic switching parameters are validated when the PLC
READY signal [Y0] is turned OFF to ON. (The logic is negative right after
power-on.)
(2) If each signal logic is set erroneously, the operation may not be carried out
correctly.
Before setting, check the specifications of the equipment to be used.

Mitsubishi QD75M1 Specifications

General

Brand	Mitsubishi
Model	QD75M1
Category	Controller
Language	English