LX3V-1WT User Manual v2 WECON Technology Co., Ltd. Website: http://www.we-con.com.cn/en Technical Support: firstname.lastname@example.org 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 WECON Technology Co., Ltd. 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 WECON Technology Co., Ltd. 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 WECON Technology Co., Ltd. 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 WECON Technology Co., Ltd. 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 WECON Technology Co., Ltd. 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 WECON Technology Co., Ltd. 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 WECON Technology Co., Ltd. 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 WECON Technology Co., Ltd. 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 WECON Technology Co., Ltd. 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 WECON Technology Co., Ltd.
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