Page 1
LX3V-2PT2DAI-BD
User manual
Website: http://www.we-con.com.cn/en
Technical Support: support@we-con.com.cn
Skype: fcwkkj
Phone: 86-591-87868869
QQ: 1043098682
Technical forum: http://wecon.freeforums.net/
Page 2
LX3V-2PT2DAI-BD
1. Installation Instructions
Before installation, it is necessary to ensure that the associated equipment of the PLC host and the
terminal of the BD module are reliably powered off.
This module comes with two standard terminals; please plug the terminals into the module
terminals after wiring. Confirm the installation of host, module and wiring are correct and then
power on.
Caution：
1) When using current output, make sure that the external load resistance is ≤500Ω. If the
external load resistance> 500Ω, the output current will be lower than normal;
2) To install the function expansion board firmly and fix it on the PLC, poor contact may cause
malfunction;
3) The fastening torque is 0.3-0.6N.m. Firmly screw down to prevent malfunctions;
4) The PLC main unit of the LX3V can only use one BD board. Don’t try to use two or more BD
boards (these BD boards will not work);
5) When mounting module to PLC, all the lights are blinking after power ON PLC, it means this PLC
can’t support it, please purchase new PLC.
Warnings：
Cut off the electricity before installation/disassembly of the unit or connection of wires onto the
unit, to prevent electric shock or product damage.
2. Features of LX3V-2PT2DAI-BD
1) It could use LX3V-2PT2DAI-BD to add 2 analog input points and 2 current output points. It is
internally installed in the top of PLC, thus it is not necessary to change the PLC’s installation
area.
2) The analog digital conversion of LX3V-2PT2DAI-BD module is PT100 input (-100 ℃ ~ 600 ℃),
current output (4~20mA), and the data of all the channels after conversion are stored inside a
special digital memory, but the converted characteristics of the analog data cannot be adjusted.
The allocation of the relevant channel addresses is in the following table.
1 WECON Technology Co., Ltd.
Page 3
LX3V-2PT2DAI-BD
Address
Description
Address
Description
M8112
The flag of RTD type in CH1
OFF: RTD Type is PT100
ON:
Disabled
D8112
CH1’s temperature at 0.1 ℃ units
M8113
The flag of RTD type in CH1
OFF: RTD Type is PT100
D8113
CH2’s temperature at 0.1 ℃ units
M8114
CH3: Flag of the input mode
OFF: Current output mode
D8114
Digital value of CH3
M8115
CH4: flag of the input mode
OFF: Current output mode
D8115
Digital value of CH4
Table 3-1
IN-2PT part 2/3-wire PT100
IN-2DAI Part Input voltage
ranges: 4~20mA
L1+
CH1 PT100 signal input (+)
Io3+
CH3 current output (+)
L1-
CH1 PT100 signal input (-)
Io3-
CH3 current output (-)
VI-
Sensor common pole
▪
Disconnect
L2+
CH2 PT100 signal input (+)
Io4+
CH4 current output (+)
L2-
CH2 PT100 signal input (-)
Io4-
CH4 current output (-)
3. Dimension
Table 2-1
Figure 3-1
LED lights indicating:
POW LED: Constantly ON when PLC power ON;
COM LED: Lit when communicating PLC, OFF when timeout;
CH1 LED: LED for CH1, constantly ON when analog signal in range, lit when analog signal out of
range (-100~600 ℃). OFF when M8112 turns ON.
CH2 LED: LED for CH2, constantly ON when analog signal in range, lit when analog signal out of
range (-100~600 ℃). OFF when M8113 turns ON.
CH3 LED: LED for CH3, constantly ON when M8114 turns OFF, OFF when M8114 turns ON.
CH4 LED: LED for CH4, constantly ON when M8115 turns OFF, OFF when M8115 turns ON.
4. Specifications
2 WECON Technology Co., Ltd.
Page 4
LX3V-2PT2DAI-BD
Item
Specification
Power supply
24VDC±10%，50mA; 5VDC±10%, 70mA (Powered by PLC host)
Temperature input (PT)
Analog input signal
PT100 sensor, 3 wires, 2 channels (CH1, CH2)
Sensor current
1mA sensor: 100Ω(PT100)
Compensation range
-100 ℃ - 600 ℃
Digital output
-1000 – 6000 (Unit: 0.1 ℃)
12 bits total, 11 bits for data and 1 bit for sign
Accuracy
0.2 ℃ - 0.3 ℃
Overall accuracy
±0.5%
Conversion rate
50ms
Conversion
characteristics
Analog output (DAI)
Rated range
4~20mA: 0~2000
Analog output
DC 4~20mA (the external load resistance is no less than 500Ω)
Digital output
12 bit binary
Resolution
8uA[4~20mA / 2000]
Precision
±0.5% of full scale
AD conversion time
One PLC scanning cycle
Input characteristics
The external load is 250Ω and 0-2000 is converted to 4-20mA
Insulation
No insulation in each PLC channel
Occupied points
None
1) General specification: The same as the PLC main unit.（Please refer to the attached instructions
supplied with the main unit of the PLC.）
2) Power specification: Powered from inside of the programmable controller.
3) Performance specifications
3 WECON Technology Co., Ltd.
Page 5
LX3V-2PT2DAI-BD
Line
type
Cross sectional
area(mm2)
End-of-pipe treatment
AWG26
0.1288
Stranded cable: stripped jacket, rub
Conductor, then connect the cable.
......
......
5. Wire Connection
Description:
1) 2-wire PT100: When using the first channel, L1- and VI- should be shorted with wires, and the
two leads of the sensor should be connected with L1 + and L1- respectively. Similarly, use the
second channel.
2) 3-wire PT100: When using the first channel, two of the same color leads are respectively
connected to L1- and VI-, and the other different color is connected to L1 +. Similarly, use the
second channel.
Warning:
Make sure cut off the electricity before installation/disassembly, to prevent electric shock or
product damages.
Caution:
1) Please keep the signal cable from the high-voltage cable at lease 100mm.
2) The shielding wire cable shall be grounded. But their grounding point can be the same with
high-voltage lines.
3) Never connect cable with forbidden size.
4) Fix the cable, so that the stress does not act on the terminal board or the cable connection
area.
5) The screwing torque of the terminal is from 0.5 to 0.6N.m. Fasten tight to prevent malfunction.
6) Keep the redundant terminals empty.
5.1 Applicable Cables
Use AWG25-16 to connect the output equipment
The maximal screwing torque is from 0.5 to 0.6N.m
The use of different types of cables might cause poor contact between the terminals. It is better to
use pressed terminals.
4 WECON Technology Co., Ltd.
Table 5-1
Page 6
LX3V-2PT2DAI-BD
AWG16
1.309
Single-core cable: stripped jacket,
Then connect the cable.
5.2 Input Mode
1) PT100 input mode
2) Current Output Mode
6. Program Examples
The thermocouple PT100 inputs for each channel are stored in registers (D8112, D8113) in digital
form. Values will be automatically stored when the “END” order is sent out. The value is calculated
by the designated analog data conversion characteristics of the special auxiliary relays M8112 and
M8113.
On the contrary process, digital value in each channel will be converted into analog value and
output in system address (D8114, D8115).
6.1 Basic Program Examples
Caution
1) M8112 and M8113 are used to analog to digital conversion for CH1 and CH2;
5 WECON Technology Co., Ltd.
Page 7
LX3V-2PT2DAI-BD
Set CH1 as K-type thermocouple input mode
Set CH1 as K-type thermocouple input mode
Set the digital value of D0 into analog value
Set the digital value of D2 into analog value
Set channel 1 as current output (4~20mA)
Set channel 2 as current output (4~20mA)
Save the value of D0 to channel 1
Save the value of D2 to channel 2
2) The PT part only supports PT100;
3) The DA part only supports current output;
4) When M8112-M8115 is ON, the channels will not work, all show “0”;
5) Don’t try to change the value in D8112 or D8113, when finished the A/D conversion;
The following project sets CH1 and CH2 as PT100 input, and the value is storage in D0 and D2.
DA conversion:
If the data are not stored into D0 or D2, then D8112, D8113 and D8114, D8115 can be
simultaneously used on setting values and other orders, such as timer/counter.
6.2 Examples of Applications
Since the LX3V-2PT2DAI-BD does not have offset and gain functions, if it needs for the values out of
the standard specifications, Additional programming orders will be needed to multiply or divide the
converted value.
Caution:
Since the use of additional programming orders, the converted precision and resolution of the
analog value are different with the specifications.
The original range of the analog output does not change.
1) Thermocouple input mode
In RTD input mode, 2PT covert a analog value to a digital value in degrees Celsius. If in the program
was a degree Fahrenheit as a unit it needs to be converted to Celsius value.
6 WECON Technology Co., Ltd.
Page 8
LX3V-2PT2DAI-BD
D10=D8112*9
D12=D10/5
D0=D12+320
D0=D8112*9/5+320
Fahrenheit and Celsius conversion formula, Fahrenheit = Celsius * 9/5 + 32, the unit is 0.1 ℃
2) Current output mode
In current output mode, it changes the digital value (0-2000) to analog value (4-20mA). If the real
digital range is 0-A (A means any value), it must be converted to 0-2000, as the following program
shows, the final digital need to be saved in D8114.
Suppose user needs 0-A digital range.
D8114=2000*D0/A
=2000*D0/10000 (A=10000)
=D0/5
Version: V1.0.1
Date: Jan 2018
7 WECON Technology Co., Ltd.
Loading...