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13.4
External I/O Signal Logic Switching Function
This function switches the signal logic according to the external equipment connected to the LD75.
For the system in which drive unit READY with 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 drive unit READY, 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".
• Parameter setting details
• 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
• Selection of logic of signals input from external source to LD75
b0
b1
b2
b3
Input signal
b4
[Pr.22]
logic selection
b5
b6
b7
b8
b9 to b15
• Selection of logic of signals output from LD75 to external
b0
Output signal
[Pr.23]
logic selection
b1 to b3
b4
b5 to b15
Refer to Page 118, Section 5.2 for the information on detail settings.
(2) Precautions on parameter setting
• 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.)
• 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.
614
Setting details
Lower limit
Upper limit
Drive unit READY
Stop signal
External command signal
Zero signal
Near-point dog signal
Unused
Manual pulse generator
input
Unused
source
Command pulse signal
Unused
Deviation counter clear
signal
Unused
Factory-set
initial value
0: Negative logic
1: Positive logic
0
Set "0".
0: Negative logic
1: Positive logic
Set "0".
0: Negative logic
1: Positive logic
0
Set "0".
0: Negative logic
1: Positive logic
Set "0".
Buffer memory address
Axis 1
Axis 2
Axis 3
31
181
331
32
182
332
Axis 4
481
482
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