9.Adjustment of the I/O Characteristics

9.1 I/O characteristics

The standard characteristics (factory default) are shown by the solid lines in the figure below. These characteristics can be adjusted to suit the user's application.

Standard characteristics of voltage output

 

 

 

 

 

10.235V

 

 

 

 

Analog

 

10V

 

 

 

 

2,047

 

 

 

 

 

 

 

 

output

5V

 

 

 

 

 

 

 

 

 

 

 

 

 

-2,000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1,000

2,000

2,048-

 

 

 

0

 

 

 

 

 

 

ut

ode

Digitalinput

 

 

 

 

m

 

 

utp

 

 

 

 

 

 

 

 

o

 

 

-10V

 

 

 

 

 

 

 

 

 

 

 

 

 

-10.24V

 

 

 

 

 

Standard characteristics of current output (4mA to 20mA)

20mA

 

Analog

 

output

1

 

e

 

d

 

o

 

m

 

t

4mA

u

tp

 

Ou

01,000

Digitalinput

Standard characteristics of current output (0mA to 20mA)

 

20mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

e

 

 

 

 

 

 

 

d

 

 

 

 

 

 

 

o

 

 

 

 

 

 

m

 

 

 

Analog

 

 

t

 

 

 

 

 

 

u

 

 

 

 

 

 

 

tp

 

 

 

 

output

u

 

 

 

 

 

O

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

01,000

Digitalinput

!...Gain value: Analog output value when the digital input is 1,000 ▲ ...Offset value: Analog output value when the digital input is 0

Offset and gain can be set independently or together. Possible offset ranges are -5V to 5V or -20mA to 20mA, and gainvalue-offset value=1V to 15V or 4mA to 32mA. (Actual output can only be a positive value.)

Gain and offset can be adjusted from software in the main unit. When the slope of the I/O characteristic line is steep:

Slight changes to the digital input will greatly increase or reduce the analog output.

When the slope of the I/O characteristic line is gentle:

Slight changes to the digital input will not always change the analog output.

Note

That the resolution (minimum possible change of analog output) of the FX2NC-4DA is fixed.

9.2 Adjustment of I/O Characteristics

An example program for adjustment is shown below. The example shows that for channel CH2 of FX2NC-4DA block No.1, the offset value is changed to 7 mA, and the gain value to 20 mA. Note that for CH1, CH3, and CH4, the standard voltage output characteristics are set.

9.3 Program Examples

X010

 

 

 

SET

M0

 

OPERATION START

 

 

 

 

 

 

 

 

 

 

 

 

(H0010)→BFM#0

M0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TO

P

K0

K0

H0010

K1

 

Sets the mode of the output

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

channel.

 

 

 

 

 

TO

P

K0

K21

K1

K1

 

(K1)→BFM#21

 

 

 

 

 

 

Permits adjustment of I/O

 

 

 

 

 

 

 

 

 

 

 

 

T0

 

characteristics.

 

 

 

 

 

 

 

 

 

 

 

 

K30

(K7000)→BFM#12

 

 

 

 

 

 

 

 

 

 

 

 

 

T0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sets the offset data.

 

 

 

 

 

TO

P

K0

K12

K7000

K1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Offset value: 7 mA)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(K20000)→BFM#13

 

 

 

 

 

TO

P

K0

K13

K20000

K1

 

 

 

 

 

 

 

Sets the gain data. (Gain value: 20 mA)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(H1100)→BFM#8

 

 

 

 

 

TO

P

K0

K8

H1100

K1

 

CH2 offset/gain setting command

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

K30

 

T1

 

 

 

RST

M0

 

OPERATION END

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(K2)RBFM#21

 

 

 

 

 

TO

P

K0

K21

K2

K1

 

 

 

 

 

 

 

Inhibits adjustment of I/O characteristics

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Characteristics after the calibrations above.

20mA

Analog output

7mA

01,000

Digitalinput

10.Troubleshooting

If the FX2NC-4DA does not operate properly, check the following items

1)Check the external wiring. Refer to section 4 of this manual.

2)Check status of the POWER indicator lamp (LED) of the FX2NC-4DA.

ON :The special function block is properly connected.

OFF or flash :Check the connection of the special function block. Also check the 5V power supply capacity.

3) Check status of the 24 V power indicator lamp (LED) of the FX2NC-4DA. ON :24V DC is supplied.

OFF :Supply 24V DC (±10%) 130mA to the FX2NC-4DA.

4)Check the status of the D/A conversion indicator lamp (LED) of the FX2NC- 4DA.

Flash :D/A conversion is normal.

ON or OFF :The ambient conditions are not suitable for the FX2NC-4DA, or the FX2NC-4DA is defective.

5)Check that the external load resistance connected to each analog output

terminal does not exceed the capacity of the FX2NC-4DA drive (voltage output: 2kΩ to 1 MΩ / current output: 500Ω or less).

6)Check the output voltage or current value using a voltmeter or ammeter, and confirm that the output meets the I/O characteristics. If the output does not meet the I/O characteristics, adjust the offset and gain again. Refer to section 9.

Note

To test the withstand voltage of the FX2NC-4DA, connect all the terminals to the grounding terminal.

HEAD OFFICE

:

MITSUBISHI DENKI BLDG MARUNOUTI TOKYO 100-8310

HIMEJI WORKS

:

840, CHIYODA CHO, HIMEJI, JAPAN

 

 

 

Specifications are subject to change without notice