LX3V-1WT User Manualv2

LX3V-1WT User Manualv2
LX3V-1WT
User
Manual
v2
WECON Technology Co., Ltd.
Website: http://www.we-con.com.cn/en
Technical Support: liux@we-con.com.cn
Skype: “fcwkkj” or “Jason.chen842”
Phone: 86-591-87868869
QQ Group: 465230233
Technical forum: http://wecon.freeforums.net
LX3V Series PLC
1. Weighing module principle
Metal material subtle changes, when the metal material by tension, the electrical impedance
increases. Conversely, when compressed, the metal impedance decreases, strain gages made by this
method are called weighing modules. This type of device converts the pressure in a physical phenomenon
into electrical signal output, so it often used in the occasion of load, tension and pressure conversion.
2. Introduction
1) Thanks for your purchasing WECON LX3V-1WT expansion module, the maximum resolution is
24-bit, using 4 or 6 wires weighting sensor;
2) Please read this manual carefully before attempting to operate, this manual is only written for
LX3V-1WT;
3) Using FROM/TO command to read/write data by LX3X main unit;
2.1 Specification
Table 2-1
Item
Description
Channel
Signal channel
A/D converter
24 bitΔˉ∑ A/D
Resolution
24bit (signed)
Speed
7.5/10/25/50/60/150/300Hz available
Polarity
Unipolar and bipolar
Non-linearity
≤0.01% full scale(25℃)
Zero drift
≤0.2μV/℃
Gain drift
≤10ppm/℃
Excitation current
5V,load impedance≥200Ω
Sensor sensitivity
1mV/V-15mV/V
Isolation
Transformer (power supply) and the optical coupler (signal)
Lamp
Power supply lamp, communication lamp
Power supply
24V±20% 2VA
Operating temperature 0~60℃
1
Storage temperature
-20~80℃
Dimension
90(L)x58(W)x80(H) mm
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LX3V Series PLC
2.2 Valid bits
For details, refer to sampling frequency in Chapter 5, Section 5.2 of this manual.
3. Dimensions
Figure 3-1
① Extension cable and connector
⑥ Analog signal output terminal
② Com LED: Light when communicating
③ Power LED: Light when getting power
④ State LED: Light when normal condition
⑤ Module name
⑦ Extension module interface
⑧ DIN rail mounting slot
⑨ DIN rail hook
⑩ Mounting holes (φ4.5)


Be sure to use the crimp-style terminals that satisfy the
dimensional requirements shows in the left figure.
Apply 0.5 to 0.8 N.m (5 to 8 kgf.cm) torque to tighten the
terminals to prevent abnormal operation.
Figure 3-2
3.1 Terminals instruction
Table 3-1
Terminals
2
Instruction
WECON Technology Co., Ltd.
LX3V Series PLC
24V+
Power supply+
24V-
Power supply-
GND
Grounding
FG1
Sensor grounding
E1-
Power supply- (5V) for sensor
E1+
Power supply+ (5V) for sensor
S1-
Signal output – of sensor
S1+
Signal output + of sensor
F1-
Feedback – of sensor
F1+
Feedback + of sensor

4. Wiring
Note:
1) The impedance of the weighing
sensor is greater than 50 Ω
2) The sensor with 4 wires requires
E1+ connecting with F1+, E1
connecting with F1.
5. BFM instruction
5.1 BFM list
Table 5-1
BFM
Latched Read/Write
0
O
R
Model
5011
LX3V-1WT model number
1
O
R
System version
116
Software & hardware version
2
Function
Default
Range
Description
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LX3V Series PLC
2
3
4
O
O
X
R/W
R/W
R
Unipolar/Bipolar
Frequency
State
0
1
0-1
0: bipolar
0-9
0: 7.55 Hz;
1: 10 HZ;
2: 25 Hz;
3: 50 Hz;
4: 60 Hz;
1: unipolar
5: 150 Hz;
6: 300 Hz;
7: 600 Hz;
8: 960 Hz;
9: 2400 Hz;
b0: CH1 no-load;
b1: Reserved;
b2: CH1 overload;
b3: Reserved;
b4: CH1 measured value is
0
stable;
b5-b15: Reserved;
5
6
7
X
X
O
R
R/W
R/W
Error
Tare weight
Gross/Net weight
0: No error;
1: Error;
b0: Power supply error
b1: Hardware error
b2: CH1 conversion error
b3-b15: Reserved
0
Save tare weight by current
weight:
0
0: Disable;
1: Enable, reset to 0;
Display gross weight or net
weight by current weight
0: CH1 gross weight;
1: CH1 new weight;
0xF: CH1 closed;
0
0 by default。
0x0001:CH1 return to 0
0x0002:CH1 calibrating:
8
X
R/W
Calibrating
weight
9
X
R/W
Reset to default
3
0
0
Step1: Remove all load ;
Step2: BFM #8 shows 0x0001;
Step3: Add known weight;
Step4: Write known weight to
BFM#23,
Step5: BFM #8 shows0x0002
1
Reset all BFM values to default
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LX3V Series PLC
10
O
R/W
Filtering mode
0
0-1
11
O
R/W
Filtering strength
3
0-7
R/W
Zero
tracking
0
intensity
R/W
Zero
range
12
13
14
15
16
17
18
19
20
21
O
O
O
R/W
tracking
Automatically
zeroing
0
0-300
The value of zero tracking
range
(0: no limit)
0-4
0: Disable auto zeroing;
1: ±2%MAX;
2: ±5%MAX;
3: ±10%MAX;
4: ±20%MAX;
X
R
Reserved
X
R
0
O
R/W
CH1
average
O
R/W
CH1 tare weight
O
R/W
CH1 average L
CH1 average H
CH1
0
0-200
The value of zero tracking
intensity
(0: disable zero tracking)
sliding
standstill
checking times
5
Average weight of CH1 (High)
1-50
Range: K-8388608~K8388607
Default value: K0
0
10
Setting range:K1~K50;
Default value: K12;
1-500
CH1 standstill checking times
(5.3-2)
Example: checking time: 10ms,
standstill checking times: 10,
checking range: 1000, when
variation is greater than 1000,
this measured value is not
stable, BMF#4-b4 will be 0. If
not BMF#4-b4 will be 1.
R/W
CH1
range
R/W
CH1 calibration
1000
weight value
-8388608~ #8
8388607
CH1 maximum
-8388608~ Show error when exceeds Max.
weight value
8388607
22
O
23
O
24
O
25
O
R/W
26
O
R/W
27
O
R/W
28
O
R/W
29
O
R/W
30
O
R/W
checking
Average weight of CH1 (Low)
0
10
32767
1-10000
CH1 zero limit
10
(High limit)
-8388608~ Bit of zero weight equals to 1
when all of load removed
8388607
CH1 zero
(Low limit)
-8388608~
8388607
limit
-10
Note:
4
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LX3V Series PLC
1) O: yes;
2) X: no;
3) R: read;
4) W: write;
5.2 Buffer (BFM) description
1) BFM0: Module code
LX3V-1WT code: 5011
2) BFM1: module version
Module version (decimal)
Example
BFM1=116, means V1.1.6
3) BFM2: Polarity
Due to the singed integer (from analog to digital, so value for Bipolar will be minus
4) BFM3: Sampling frequency
The frequency of input signal collection, lower frequency, more stable; higher precision, lower speed
relationship between set value and the sampling frequency:
Table 5-2
Sample
frequency (HZ)
Sample
precision (Bits)
Sample
frequency (HZ)
Sample
precision (Bits)
0
7.5
23.5
5
150
21.5
1
10
23.5
6
300
21
2
25
23
7
600
20.5
3
50
22
8
960
20
4
60
22
9
2400
17.5
Setting
Setting
5) BFM4: State code
Table 5-3
Bit No.
5
Description
Bit 0
H0001
CH1 no-load
Bit 2
H0004
CH1 over-load
Bit 4
H0010
CH1 stable
bit 1, bit 3, bit 5-bit 15
Reserved
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LX3V Series PLC
6) BFM5: Error code
Table 5-4
bit No.
Value
Error
bit No.
Value
Error
bit 0
K1 (H0001)
Power failure
bit 1
K1 (H0001)
Hardware failure
bit 2
K2 (H0004)
CH1 conversion error
bit 3- bit 15
Reserved
Note: Save all error state of data registers, each error status is determined by the corresponding bit,
there are May generate more than two states at same time, 0: no error, 1: error.
7) BFM6: Tare setting
Select the current weight value (BFM16-17) as a tare (BFM19-20) weight value. Each channel occupies
one bit, available when 1, reset to zero automatically.
For example
The current weight is 100, after setting tare weight:
If it displays gross weight (BFM7 = 0) currently, the tare weight (BFM19-20) will become 100, the
current weight is still 100;
If it displays net weight (BFM7 = 1), the tare weight (BFM19-20) will be original value + current weight
value, the current weight value becomes zero.
8) BFM11: filtering strength
The higher filter strength, the more stable and accurate weight value.
9) BFM12: zero tracking strength
Zero-tracking is to make stable when no-load, Zero tracking is alleged intensity values within this range,
used to reduce the influence of temperature.
Table 5-5
Setting
Description
Note
0
Zero tracking OFF
Default
1-200
Range of weight value
10 means ± 10
Others
Reserved
Note: when lower precision required, user could
disable this function.
10) BFM13:Range of Zero tracking
Accumulated range of zero tracking, stop tracking when out of range
Table 5-6
6
Setting
Description
Note
0
No limit for zero tracking
Default
1-300
Range of weight value
10 means ±10
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LX3V Series PLC
Others
Reserved
Note: when lower precision required, user could
disable this function.
Example
Setting value is 100, when the position within ± 100, it will be read as no-load.
5.3 Function Instruction
1) Weight measurement
Normally, users can choose to measure the net weight or gross weight of an object. The net weight
means the weight of the product itself, that is, the actual weight of the product without its external
packaging.
The weight of the packaging is called the tare weight. The gross weight is the total weight, namely the
net weight plus the tare weight.
 Tare weight: weight of the packaging
 Net weight: the weight of the product, excluding the packaging.
 Gross weight: the net weight plus the tare of the product.
 Gross weight= net weight + tare weight.
Example 1
A product weighs 10kg and the carton contains it weighs 0.2kg, then its gross weight is 10.2 kg (net
weight=10kg, tare weight=0.2kg, gross weight=10.2kg)
Example 2
Use the measured value at CH1 as the net weight and disable CH2. If you know the weight of the
packaging already, you can skip the step of reading the tare weight.
 Read the tare weight
Step 1: Write H’0000 into CR#7.
Step 2: Place the packaging on the CH1 load cell.
Step 3: Write H0001 into CR#6 to take the weight of the packaging as the tare weight.
 Set CR#7 = H00F1.
2) Standstill check
When an object is placed on the load cell to measure its weight, you can use the standstill check to
know that the measured value has been stable.


7
If the measured value shifts within the range for standstill check set up by the user, bit4 will be set
to “1”.
If the measured value shifts beyond the range for standstill check set up by the user, bit4 will be
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LX3V Series PLC
set to “0”. They will be set to “1” again when the range is returned to the set range.
Example
The measuring time is 10ms, the times of standstill check is 10, and the range for standstill check is
1,000. When the range for standstill check exceeds 1,000, the measured value will be regarded
unstable, i.e. bit4 will be set to 0. When the measuring time is within 100ms (10 × 10ms) and the
range returns to be within 1,000, bit4 will be set to 1 again. We recommend you check if the measured
value is stable enough before operating it.
3) Zero detection
Users can use this function to know if the object has been removed from the load cell. If the bit4 is 1,
and the bit0 and bit1 are 1 as well, the object has been removed from the load cell already, and you will be
able to perform the next step of the control.
4) Filtering
The average value is a steady value obtained from the sum of the read values. However, due to
unavoidable external factors, the read values may be an acute pulse, resulting in fierce changes in the
average value. The filtering function thus exclude the read value that is an acute pulse from the sum-up and
equalization, so the average value obtained will not be affected by the acute read value.
6. Example
1) Current state of weight
Read the current state BFM4, judge by bit. More information, please refer to 5.2.
2) Get current weight value
Read average weight value (BFM16) to D0
3) Calibrating weight
*In the new version, the step 1 can be used for manual reset.
Adjustment and calibration are to make the weight values of module and the module of heavy load
units is consistent.
8
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LX3V Series PLC
Step 1: Remove all weights;
Step 2: Write 0x0001 to #8;
Step 3: Add known weights;
Step 4: Write known weights (D2) to #23;
Step 5: Write 0x0002 to #8
4) Tare weight and gross weight
Set value as tare weight by writing K1
to BFM6
Set the value as Net weight by writing
K1 to BFM7
Set the value as gross weight by writing
K0 to BFM7
5) Filter method and strength
After setting the filtering method and filtering strength, need to recalibrate
Set filtering by writing value to BFM10
Set filtering by writing value to BFM11
6) Zero tracking
Zero tracking is used to reduce the temperature drift interference;
Zero follow the strength is 0; it means disable zero tracking;
The zero tracking range is 0, which indicates that the cumulative range is not limited.
9
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LX3V Series PLC
7. Diagnosis
7.1 Check
1) Make sure all cables placed in right position;
2) Make sure the number of special function modules cannot be greater than 8, and the total I / O
points does not exceed 256 points;
3) Make sure select the correct operating range in application;
4) Make sure power supply is working properly;
5) LX3V CPU unit is in RUN mode;
7.2 Check the error
Check the following items, if LX3V-1WT cannot work properly:
1) Check the LED state of power supply
ON: Check the module connection cable
OFF: Check the module connection cable
2) Check the wiring
3) Check status of the 24 V power indicator lamps (LED) of the LX3V-4DA.
On: 24 VDC is supplied.
Off: Supply 24 VDC (+10%) to the LX3V-1WT or check power supply
4) Check the state of LED“COM”(on the right top corner of LX3V-1WT)
ON: communicating
OFF: Check the state of #5(error), any bit (b0 b1 b2) in #5 is ON, means communication failure,
refer to 5.2 to find out the reason
Data: Oct 2016
10
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