FX-2DA
SPECIAL FUNCTION BLOCK
USER'S GUIDE
JY992D52801C
This manual contains text, diagrams and explanations which will guide the reader in the correct installation
and operation of the FX-2DA special function block and should be read and understood before attempting
to install or use the unit.
Further information can be found in the FX PROGRAMMING MANUAL and FX SERIES HARDWARE
MANUAL.
1
●
The FX-2DA analog special function block has two output channels. The output channels take a digital value
and output an equivalent analog signal. This is called a D/A conversion. The FX-2DA has a maximum
resolution of 12 bits.
●
The selection of voltage or current based input/output is by user wiring. Analog ranges of -10 to 10V
(resolution: 5mV), and/or 4 to 20mA (resolution: 20µA) maybe selected.
●
FX programmable controllers versions 2.0 or later (those with serial number 13XXXX or larger) are
required; as these units have the TO/FROM applied instructions in their instruction set. Data transfer
between the FX-2DA and the FX base unit is by buffer memory exchange. There are 32 buffer memories
(each of 16 bits) in the FX-2DA.
●
The FX-2DA occupies 8 points of I/O on the FX, FX2C expansion bus. The 8 points can be allocated from
either inputs or outputs. The FX-2DA draws 30mA from the 5V rail of the base unit or powered extension
unit.
INTRODUCTION
1.1 External dimensions Weight : Approx. 0.5kg (1.1 lbs) Dimensions : mm (inches)
2
Extension cable
and connector
Any connection to these terminals
may damage the FX-2DA.
M3.5 (0.14)
terminal screws
24V LED
63 (2.48)
73 (2.87)
Wiring
D-A LED
125 (4.92)
140 (5.51)
1
0 (
0.39)
95 (3.74)
Groove for
35mm (1.38)
wide DIN rail
2-5.5mm (0.22)
hole
DC24V ±10% 130mA
Class 3
Grounding
(100 Ω or less)
*4
PC
+24V
0V
DC/DC
converter
FX-2DA special function block
Extension cable
*1 Use a twisted pair shielded cable for the analog
output. This cable should be wired away from
power lines or any other lines which could induce
noise.
*2 Apply 1-point grounding at the load side of the
output cable (class 3 grounding: 100 Ω or less). If
electrical noise is caused from grounding,
disconnect from grounding.
*3 If electrical noise or a voltage ripple exists at the
output, connect a smoothing capacitor of 0.1 to
0.47 µF, 25V.
Voltage output
V
+
V
I
I
V
V
I
I
*1
+
-
+
-
Current output
+
-
*1
*2
*2
Inverter,
etc.
*3
Recorder,
etc.
AG
+15V
-15V
CH1
CH2
*4 Connect the ground terminal on the FX-2DA with
the ground terminal on the base unit of the
programmable controller. Use class 3 grounding
on the base unit, if available.
Caution;
(a) The same output channel cannot drive current
and voltage output loads at the same time!
(b) Shorting the voltage output terminals may da-
mage the unit!
3
INSTALLATION NOTES AND USAGE
3.1 Environment specification
Item
Environment specifications
3.2 Power supply specifications
Item
Analog circuits
Digital circuits
3.3 Performance specifications
Item
Voltage or current outputs can be individually selected with each output
Max. convertible
output range
Digital input
(external load: 1kΩ
Voltage = -2048 to +2047
Same as those for the FX base unit
24V DC ±10% 130mA
(external power supply)
(internal power supply from base unit)
Voltage output
terminal. There are a total of 2 output points.
DC -10V to +10V
to 1MΩ)
(external load: 500 Ω or less)
Specification
Specification
5V DC, 30mA
Current output
DC+4mA to +20mA
Current = 0 to +1000
Resolution
Overall accuracy
Conversion speed
5mV (10V full scale 1/2000)
±1% full scale (10V range)
20µA (20mA full scale 1/1000)
±1% full scale (20mA range)
18ms for 2 channels (normal speed), 3.5ms for 2 channels (high speed).
Analog output continued...
Factory Presets
Load:
ΩΩ
= 10k
(voltage
Ω
ΩΩ
Output)
ΩΩ
= 250
Ω
(current
ΩΩ
Output)
Analog output
-2000 -1000
-2048
-10.24V
+10V
+ 5V
+10.235V
0 +1000 +2000
- 5V
Digital input
-10V
+2047
+20mA
Analog output
+ 4mA
Gain and offset can be adjusted using the procedure described in chapter 4.
0 1000
Digital input
Specification
Photo-coupler isolation between analog and digital circuits.
DC/DC converter isolation of power from FX base unit.
No isolation between analog channels.
8 points taken from the FX expansion bus
(can be either inputs or outputs)
Item
Isolation
Number of occupied I/O
points
ATTENTION FOR WHEN SWITCHING SYSTEM ON/OFF
Due to the inevitable timing difference of the DC24V for the analog circuits and other power lines of the
base unit, the output of the FX-2DA special function block may behave erroneously before settling down
to operational conditions in approximately 1sec. Therefore, ensure that this behavior is taken into account
such that the end performance of the system is not degraded.
(example)
Power switch
Miscellaneous
DC24V
supply
FX-2DA special
function block
cut analog lines
before switching
External analog
machine
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