Adjustment Of I/O Characteristics; 10.Troubleshooting - Mitsubishi FX2N-4DA User Manual

... 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. Reasonable offset ranges are -5V to +5V or -20mA
to +20mA, and gainvalue-offset value=1V to 15V or 4mA to 32mA.
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

9.2 Adjustment of I/O Characteristics

An example program for adjustment is shown below. The example shows that for channel CH2 of FX
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.
X010
M0
TO P
TO P
T0
P
TO
TO P
TO P
T1
P
TO

10.TROUBLESHOOTING

If the FX -4DA does not operate properly, check the following items
2N
1) Check the external wiring. Refer to section 4 of this manual.
2) Check status of the POWER indicator lamp (LED) of the FX
On : The extension cable is properly connected.
Off or flash : Check connection of extension cable. Also check the 5 V power supply capacity.
3) Check status of the 24 V power indicator lamp (LED) of the FX
On : 24 VDC is supplied.
Off : Supply 24 VDC (+10%) to the FX
4) Check the status of the D/A conversion indicator lamp (LED) of the FX
Flash : D/A conversion is normal.
On or off : The ambient conditions are not suitable for the FX
5) Check that the external load resistance connected to each analog output terminal does not exceed
the capacity of the FX
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.
To test the withstand voltage of the FX
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industrial property rights which may occur as a result of using the contents noted in this manual.
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SET M0
K1 K0 H0010 K1
K1 K21 K1 K1
T0
K30
K1 K12 K7000 K1
K1 K13 K20000 K1
K1 K8 H1100 K1
T1
K30
RST M0
K0 K21 K2 K1
-4DA drive (voltage output: 2kΩ to 1 MΩ / current output: 500Ω).
2N
2N
Manual number : JY992D65901
Manual revision : C
Date
OPERATION START
(H0010)→BFM#0 Sets the
mode of the output channel.
(K1)→BFM#21
Permits adjustment of I/O
characteristics.
(K7000)→BFM#12
Sets the offset data. (Offset value: 7 mA)
(K20000)→BFM#13
Sets the gain data. (Gain value: 20 mA)
(H1100)→BFM#8
CH2 offset/gain setting command
OPERATION END
(K2)RBFM#21
Inhibits adjustment of I/O characteristics
2N
-4DA.
2N
Note
-4DA, connect all the terminals to the grounding terminal.
: March 2007
-4DA is fixed.
2N
+ 2 0 m A
A n a l o g
o u t p u t
+ 7 m A
0
D i g i t a l i n p u t
-4DA.
-4DA.
2N
-4DA.
2N
-4DA, or the FX
2N 2N
-
2N
+ 1 , 0 0 0
-4DA is defective.