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7. ADJUSTMENT OF OFFSET AND GAIN
7.1 Change in output characteristic
At shipment, 0 to 4000 range is selected for 0 to 10V DC output.
When using an FX
-2DA for current or differing voltage output except 0 to 10V DC, it is necessary to
2N
readjust the offset and gain.
The output characteristic can be set for each of the two channels.
Set analog values within the range specified in the table below when changing the output characteristic.
Range of output characteristic
Voltage output
Analog value when digital value is 0
0 to 1V
Analog value when digital value is 4000
5 to 10V
Resolution changes depending on the set value when the output characteristic changes accordingly.
Example: Resolution becomes (5 - 0V)/4000=1.25mV at voltage output 0 to 5V/0 to 4000.
Integrated accuracy does not change. (Voltage output: ± 0.1V, Current output: ± 0.16mA)
The adjustment of the offset and gain values sets a digital equivalent to the analog data.
(The "POT" requires 18 revolutions to move between MIN and MAX setting.)
Voltage output
Current output
FX
-2DA
FX
-2DA
2N
2N
VOUT
VOUT
+
+
IOUT
V
Voltmeter
IOUT
A
Ammeter
-
COM
COM
-
*1 The analog value increases if the volume is turned clockwise.
7.1.1 Adjustment of gain
The gain value can be set to an arbitrary digital value.
However, using the maximum of 12bit resolution provides the user with a full scale analog value.
Voltage output
Voltage output
characteristic (0 to 5V)
characteristic (0 to 10V)
10V
5V
0
4000
0
4000
Digital value
Digital value
7.1.2 Adjustment of offset
The offset value in the case of voltage output is 0V. The offset value in the case of current output is 4mA.
However, the offset value can be minutely adjusted if necessary. Set the following when minute
adjustments are necessary.
Voltage output
V oltage output
characteristic (0 to 10V)
characteristic (0 to 5V )
at shipment
100mV
100m V
0
40
0
80
Digital value
D igital value
For instance, when a digital range of 0 to 4000 is used with the analog range of 0 to 10V, a digital value of
40 is equal to an analog output of 100mV, (40 × 10V/4000 digital points). When a digital range of 0 to 4000
is used with the analog range of 4 to 20mA, a digital value of 0 is equal to an analog output of 4mA.
1) Adjust the offset and gain respectively for CH1 and CH2.
2) Repeat offset and gain adjustments until a stable value is obtained.
3) Adjust the gain before the offset.
8. PROGRAM EXAMPLE
The following program examples (8.1 and 8.2) are formula circuits.
The device numbers that have been underlined can be assigned by the user during programming.
8.1 At connection to FX
X000
0
Current output
4mA
20mA
X001
61
Volume *1
CH1
Offset volume
CH1
OFFSET
CH1
CH1
Gain volume
OFFSET
POWER
POWER
CH2
Offset volume
CH1
GAIN
CH1
CH2
GAIN
OFFSET
CH2
CH2
CH2
GAIN
OFFSET
CH2
Gain volume
GAIN
Digital to analog conversion execution input of CH1 :X000
Voltage output
Digital to analog conversion execution input of CH2 :X001
characteristic (4 to 20mA)
At the same time X000 and X001 can be turned ON.
20m
D/A output data CH1:D100 (Replace with auxiliary relay M100 to M131. Assign these numbers only once)
A
D/A output data CH2:D101 (Replace with auxiliary relay M100 to M131. Assign these numbers only once)
Processing time: 4ms / 1 channel
(Time until FX
8.2 At connection to FX
4mA
0
4000
X000
0
Digital value
V oltage output
characteristic (4 to 20m A )
X001
51
4m A
0
D igital value
Digital to analog conversion execution input of CH1 :X000
Digital to analog conversion execution input of CH2 :X001
At the same time X000 and X001 can be turned ON.
D/A output data CH1:D100 (Replace with auxiliary relay M100 to M115. Assign these numbers only once)
D/A output data CH2 :D101 (Replace with auxiliary relay M100 to M115. Assign these numbers only
once)
Processing time:4ms / 1 channel
(Time until FX
8.3 Connection to FX
Please use FNC 177 (WR3A).
Refer to FX series Programming Manual ΙΙ.
series PLC
0N
a)Digital data (D100) is progressed to
[M0V
D100
K4M100 ]
a
supplementary relay (M100-M115).
[M0V
K2M100 K2M116 ]
b
b)The lower 8 bit data is moved.
c) The lower 8 bit data is written to the
[T0
K0
K16
K4M116 K1
]
c
FX
-2DA.
2N
[T0
K0
K17
H0004
K1
]
d
d)The lower 8 bit data is held.
[T0
K0
K17
H0000
K1
]
e)The higher 4 bit data is moved.
[M0V
K2M108 K2M116 ]
e
f) The higher 4 bit data is written to the
[T0
K0
K16
K4M116 K1
]
f
FX
-2DA.
2N
g)The D/A conversion of CH1 is
[T0
K0
K17
H0002
K1
]
g
executed.
[T0
K0
K17
H0000
K1
]
h)Digital data (D101) is progressed to
[M0V
D101
K4M100 ]
h
supplementary relay (M100-M115).
[M0V
K2M100 K2M116 ]
i
i) The lower 8 bit data is moved.
[T0
K0
K16
K4M116 K1
]
j
j) The lower 8 bit data is written to the
FX
-2DA.
2N
[T0
K0
K17
H0004
K1
]
k
k) The lower 8 bit data is held.
[T0
K0
K17
H0000
K1
]
l
l) The higher 4 bit data is moved.
[M0V
K2M108 K2M116 ]
m)The higher 4 bit data is written to the
[T0
K0
K16
K4M116 K1
]
m
FX
-2DA.
2N
[T0
K0
K17
H0001
K1
]
n)The D/A conversion of CH2 is
n
[T0
K0
K17
H0000
K1
]
executed.
-2DA outputs analog value after turning on X000 and X001.)
2N
, FX
or FX
series PLC
1N
2N
2N
a)Digital data (D100) is progressed to
[M 0V
D 100
K 4M 100 ]
a
supplementary relay (M100-M115).
[T 0
K 0
K 16
K 2M 100 K 1
]
b
b)The lower 8 bit data is written to the
[T 0
K 0
K 17
H 0004
K 1
]
FX
-2DA.
2N
c
[T 0
K 0
K 17
H 0000
K 1
]
c) The lower 8 bit data is held.
[T 0
K 0
K 16
K 1M 108 K 1
]
d
d)The higher 4 bit data is written to
[T 0
K 0
K 17
H 0002
K 1
]
the FX
-2DA.
2N
e
[T 0
K 0
K 17
H 0000
K 1
]
e )The D/A conversion of CH1 is
executed.
f) Digital data (D101) is progressed to
[M 0V
D 101
K 4M 100 ]
f
supplementary relay (M100-M115).
[T 0
K 0
K 16
K 2M 100 K 1
]
g
g)The lower 8 bit data is written to the
[T 0
K 0
K 17
H 0004
K 1
]
FX
-2DA.
h
2N
[T 0
K 0
K 17
H 0000
K 1
]
h)The lower 8 bit data is held.
[T 0
K 0
K 16
K 1M 108 K 1
]
i
i) The higher 4 bit data is written to
[T 0
K 0
K 17
H 0001
K 1
]
j
the FX
-2DA.
2N
[T 0
K 0
K 17
H 0000
K 1
]
j) The D/A conversion of CH2 is
executed.
-2DA outputs analog value after turning on X000 and X001.)
2N
(V3.00 or later) or FX
(V3.00 or later) series PLC
2N
2N
9. NOTES IN DRIVE
1) Confirm whether the output wiring of FX
-2DA and the connection of the extension cable are
2N
correctly done.
2) Confirm whether the "4. Connection with programmable controller" condition is satisfied.
3) When shipped from the factory, the output characteristic is adjusted to 0 to 10V DC.
If a different output characteristic is desired, please adjust as required.
4) The mixture use for the voltage output/the current output is possible.
10. ERROR CHECK
Confirm the following items when it seems that the FX
-2DA does not operate correctly.
2N
1) Confirm the state of POWER LED.
Lit
:The extension cable is correctly connected.
Turn off or blinks :Confirm the proper connection of the extension cable.
2) Confirm external wiring per section "3. WIRING"
3) Confirm whether the load resistance of the connected equipment corresponds to the specification of
the FX
-2DA.
2N
4) Confirm the Voltage and Current Output values with a voltmeter and an ammeter. Confirm the digital
to analog conversion from the output characteristic. Readjust the offset and gain per "7.
ADJUSTMENT OF OFFSET AND GAIN". The output characteristic when shipped from the factory is
0 to 10V DC.
Guidelines for the safety of the user and protection of the FX
FUNCTION BLOCK
•
This manual has been written to be used by trained and competent personnel. This is defined
by the European directives for machinery, low voltage and EMC.
•
If in doubt at any stage during the installation of the FX
electrical engineer who is qualified and trained to the local and national standards. If in doubt
about the operation or use of the FX
-2DA please consult the nearest Mitsubishi Electric
2N
distributor.
•
Under no circumstances will Mitsubishi Electric be liable or responsible for any consequential
damage that may arise as a result of the installation or use of this equipment.
•
All examples and diagrams shown in this manual are intended only as an aid to
understanding the text, not to guarantee operation. Mitsubishi Electric will accept no
responsibility for actual use of the product based on these illustrative examples.
•
Owing to the very great variety in possible application of this equipment, you must satisfy
yourself as to its suitability for your specific application.
Manual number : JY992D74901
Manual revision : D
Date
: SEPTEMBER 2002
HEAD OFFICE : MITSUBISHI DENKI BLDG MARUNOUTI TOKYO 100-8310
HIMEJI WORKS : 840, CHIYODA CHO, HIMEJI, JAPAN
JY992D74901D
-2DA SPECIAL
2N
-2DA always consult a professional
2N
TELEX : J24532 CABLE MELCO TOKYO
Effective Sep. 2002
Specifications are subject to
change without notice
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