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Specifications are subject to change without notice
HEAD OFFICE : MITSUBISHI DENKI BLDG MARUNOUTI TOKYO 100-8310
HIMEJI WORKS : 840, CHIYODA CHO, HIMEJI, JAPAN
When exported from Japan, this manual does not require application to the Ministry of Economy,
Trade and Industry for service transaction permission.
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
Standard characteristics of current output (4mA to 20mA)
Standard characteristics of current output (0mA to 20mA)
...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
FX
2NC
-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 FX
2NC
-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.
A n a lo g
o u tp u t
D ig ita l in p u t
1 0 V
1 0 . 2 3 5 V
- 2 ,0 0 0
2 ,0 0 0
- 1 0 V
- 1 0 .2 4 V
- 2 ,0 4 8
2 ,0 4 7
5 V
o u t p u t m o d e 0
1 ,0 0 0
A n a lo g
o u t p u t
4 m A
D ig ita l in p u t
2 0 m A
0
1 ,0 0 0
O u t p u t m o d e 1
A n a lo g
o u t p u t
2 0 m A
0
D ig ita l in p u t
1 ,0 0 0
O u tp u t m o d e 2
!
▲
9.3 Program Examples
Characteristics after the calibrations above.
10. Troubleshooting
If the FX
2NC
-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 FX
2NC
-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 FX
2NC
-4DA.
ON :24V DC is supplied.
OFF :Supply 24V DC (±10%) 130mA to the FX
2NC
-4DA.
4) Check the status of the D/A conversion indicator lamp (LED) of the FX
2NC
-
4DA.
Flash :D/A conversion is normal.
ON or OFF :The ambient conditions are not suitable for the FX
2NC
-4DA, or
the FX
2NC
-4DA is defective.
5) Check that the external load resistance connected to each analog output
terminal does not exceed the capacity of the FX
2NC
-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 FX
2NC
-4DA, connect all the terminals to the
grounding terminal.
X010
SET M0
TO K0 K0 H0010 K1P
TO K0 K21 K1 K1
P
M0
T0
TO K0 K12 K7000 K1
P
TO K0 K13 K20000 K1
P
TO K0 K8 H1100 K1
T0
T1
TO K0 K21 K2 K1
P
T1
RST M0
P
K30
K30
OPERATION START
(K7000)
→
BFM#12
Sets the offset data.
(Offset value: 7 mA)
OPERATION END
(H0010)
→
BFM#0
Sets the mode of the output
channel.
(K1)
→
BFM#21
Permits adjustment of I/O
characteristics.
(K20000)
→
BFM#13
Sets the gain data. (Gain value: 20 mA)
(H1100)
→
BFM#8
CH2 offset/gain setting command
(K2)RBFM#21
Inhibits adjustment of I/O characteristics
D ig ita l in p u t
1 ,0 0 0
A n a lo g
o u tp u t
7 m A
2 0 m A
0
Specifications are subject to change without notice
HEAD OFFICE : MITSUBISHI DENKI BLDG MARUNOUTI TOKYO 100-8310
HIMEJI WORKS : 840, CHIYODA CHO, HIMEJI, JAPAN
When exported from Japan, this manual does not require application to the Ministry of Economy
Trade and Industry for service transaction permission.