Mitsubishi Electronics QD75D, QD75P user manual External I/O signal logic switching function

13 COMMON FUNCTIONS

13.4 External I/O signal logic switching function

MELSEC-Q

This function switches the signal logic according to the external equipment connected to the QD75.

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".

[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 item

Setting details

Factory-set

Buffer memory address

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

b2

Drive unit

READY

0: Negative logic,

b3

Stop signal

Input signal logic

1: Positive logic

Pr.22

b4

External

0

31

181

331

481

selection

command signal

b5

Zero signal

b6

Near-point signal

b7

Unused

Set "0".

b8

Manual pulse

0: Negative logic,

generator input

1: Positive logic

b9 to b15

Unused

Set "0".

• Selection of logic of signals output from QD75 to external

source

b0

Command pulse

0: Negative logic,

Output signal logic

signal

1: Positive logic

Pr.23

0

32

182

332

482

selection

b1 to b3

Unused

Set "0".

b4

Deviation counter

0: Negative logic,

clear signal

1: Positive logic

b5 to b15

Unused

Set "0".

Refer to Section 5.2 "List of parameters" for the information on detail settings.

[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.

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