External I/O Signal Logic Switching Function - Mitsubishi Electric MELSEC-Q QD75M User Manual

13 COMMON FUNCTIONS

13.4 External I/O signal logic switching function

Setting item
Input signal logic
Pr.22
selection
Refer to Section 5.2 "List of parameters" for the information on detail settings.
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.
• Selection of logic of signals input from external source to
QD75
b0
b1
b2
b3
b4
b5
b6
b7
b8
b9 to b15
[2] Precautions on parameter setting
(1) The external 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.
Setting details
Lower limit 0: Negative logic,
1: Positive logic
Upper limit
Not used Set "0".
Stop signal
0: Negative logic,
External
1: Positive logic
command/
switching signal
Not used Set "0".
Near-point dog 0: Negative logic,
signal 1: Positive logic
Not used Set "0".
Manual pulse 0: Negative logic,
generator input 1: Positive logic
Not used Set "0".
13 - 7
MELSEC-Q
Factory-set Buffer memory address
initial value Axis 1 Axis 2 Axis 3 Axis 4
0 31 181 331 481