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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.
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.
Setting item
Setting details
Factory-set
initial value
Buffer memory address
Axis 1
Axis 2
Axis 3
Axis 4
[Pr.22]
Input signal
logic selection
• Selection of logic of signals input from external source to LD75
0
31
181
331
481
b0
Lower limit
0: Negative logic
1: Positive logic
b1
Upper limit
b2
Drive unit READY
b3
Stop signal
b4
External command signal
b5
Zero signal
b6
Near-point dog signal
b7
Unused
Set "0".
b8
Manual pulse generator
input
0: Negative logic
1: Positive logic
b9 to b15
Unused
Set "0".
[Pr.23]
Output signal
logic selection
• Selection of logic of signals output from LD75 to external
source
0
32
182
332
482
b0
Command pulse signal
0: Negative logic
1: Positive logic
b1 to b3
Unused
Set "0".
b4
Deviation counter clear
signal
0: Negative logic
1: Positive logic
b5 to b15
Unused
Set "0".
Содержание MELSEC-L LD75D
Страница 1: ...MELSEC L LD75P LD75D Positioning Module User s Manual LD75P1 LD75P2 LD75P4 LD75D1 LD75D2 LD75D4 ...
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Страница 11: ...9 Memo ...
Страница 47: ...45 CHAPTER 2 SYSTEM CONFIGURATION 2 2 1 General Image of System 1 When connected to a CPU module ...
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Страница 267: ...265 CHAPTER 6 PROGRAM USED FOR POSITIONING CONTROL 6 6 4 Positioning Program Examples ...
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Страница 272: ...270 Z ABRST1 instruction execution ...
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Страница 685: ...683 APPENDICES A Appendix 1 Function Update Appendix 1 1 Function comparison Memo ...
Страница 738: ...736 Memo ...
Страница 806: ...804 5 LD75D2 Unit mm 6 LD75D4 Unit mm 45 4 90 4 95 4 45 45 DIN rail center 45 4 90 4 95 4 45 45 DIN rail center ...
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