HJ3209W User Manual v1.2


Processor: Low-power 32-bit processor
Network: 2 ports 10M/100M
Input power: 24V
Power consumption: 4W
Working temperature: -20~70°C
Storage temperature: -30 ~85°C
Working humidity: 5 – 95%RH
Interface speed: 10/100M Auto
Electrical isolation: 2KV
Maximum number of connections: 4096
Number of channels: 2
Input type: 1mV/V 2mV/V adaptive
Accuracy: 0.01%
Sampling time: 2 ms
Input Impedance: 1M ohm
Protection: ESD, overcurrent and overvoltage protection

Wiring diagram


Load Cell Wiring

There are two types of load cells: four-wire and six-wire

Four-wire system: EXC+, EXC-: power line, HJ3209W supplies the DC power of the sensor. SIG+, SIG-: Signal line, the signal line of sensor output, output to HJ3209W.
In addition to the above four wires, the six-wire system has two more wires than the four-wire system:
SEN+, SEN-: Feedback line, HJ3209W uses field correction, so directly connect SEN+ and EXC+, SEN- and EXC-, and then connect to VOUT and GND of HJ3209W respectively.
Four-wire and six-wire sensors have shielded wire SHIELD, directly connect it to GND of HJ3209W

Four/six wire single sensor wiring

Four/six-wire multi-sensor parallel connection

If a weighing device has multiple sensors, directly connect the signal terminals in parallel, and then connect to one of the channels of HJ3209WH.

Configuration and use of the weigh module

The PROFINET configuration method of HJ3209W is basically the same as that of HJ3200 series IO devices

Weigh Module Type Configuration

HJ3209W (2-channel weighing)

Support sensitivity: 1mV/V or 2mV/V

Calibration by configuration software

Configuration steps:

  • Select the channel to be configured, the range (1~8)
  • Obtain the sampled value when the load cell is no-load, enter the obtained sampled value into the zero value unit, and click Set.
  • Add a full load to the sensor, obtain the sampled value again, input the obtained sampled value into the full value unit, and click Set
  • Enter the full actual weight into the range unit and click Set.
  • Finally, click to get the weight value, which should be the value of the range.
  • Skip to step 1 to continue configuring the next channel.

Calibration by PLC

1,Open the IO mapping space of HJ3209W.

2,Open monitoring table directly, add IW and QW space

Add Mode, Channel, Max, Min, Rang, Sample and Channel Data. Note that Max, Min, Rang, Sample and Channel Data are 32-bit data, and Mode and Channel are 16-bit data.

3,Set the Mode of HJ3209W to 1, and write the number of channels to be modified.

Channel numbers are from 1 to 8, other data are invalid.

MODE field introduction:

MODE=0: Weighing data collection mode
MODE=1: Comparison mode MODE=2: Clear mode for specified channel MODE=3: Set dynamic undetermined check range mode for specified channel

4,Fill in the corresponding modified value with the sampled value of no load, the sampled value of full load with weights and the weight of weights in turn. The sampling value may fluctuate a little, and you can fill in the middle value of the fluctuation according to the actual situation. You can also calculate the average value and fill in the full load or no load.

Fill in the sampling value of the corresponding channel when empty weighing into the Min empty value unit

As follows, 295 is a null value, which is the sampling value of the first channel when no weight is placed

Put in the weight, fill in the sampling value of the corresponding channel into Max (full value), note that it is a 32-bit data type ID, not a 16-bit data type IW

Range refers to the weight of the weight. If it is in grams, the actual value measured is in grams. If it is in kilograms, the measured value is in kilograms. The following example is a weight with 6000 grams. , fill in 6000 in the range, it means that the unit is in grams.

Click “Update Now to Modify Selected Items” to complete the channel configuration

If you want to clear symmetrically, you need to set the Mode to 2 (clearing mode), set the Zero unit to 1, select the channel to be cleared, update the data to the device, and the device will clear the channel immediately. 0, then disable the clear function of this channel. When the clear function is enabled, the actual data is equal to the weighing data minus the tare weight.

As follows, after the operation of clearing 0, the weighing display is 0, and there is a weight of 1000 grams (equivalent to tare) on the scale.

Dynamically stabilized signal usage

The dynamic stability signal means that after the weight is stable enough for a certain period of time, it outputs a 1 signal to the PLC. The PLC uses this signal to judge that the weighing weight is stable and then performs the next reset or calibration work, and resets when the weight is unstable. and calibration will cause errors.

Two parameters are needed to judge the stability of weighing weight: stable time and stable detection range. If the weight fluctuation exceeds the stable detection range within the stable time, it is considered that the weighing weight is unstable and a 0 signal is output.

If the weight fluctuation does not exceed the detection range within the stable time, it is considered that the scale is stable and a 1 signal is output.

The default stabilization time of the VM3209W device is 1 second, and the detection stabilization range is 10 units. For example, if the set range is grams, then
So the stable range is 10 grams, if the set range is kilograms, then the stable range is 10 kilograms.

As can be seen from the figure above, the time delay from the measurement reaching a stable signal until the output 1 is 1 second.

Modify the stable measurement range

Set the mode MODE to 3, select the corresponding channel, set the Stable Range to the required dynamic stability range value, and modify the dynamic stability range value when the data is transferred to the device.

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