Quantitative weighing and packaging scale instrument

BMT-A105 Intelligent Digital Display Controller

Product link:https://item.taobao.com/item.htm?ft=t&id=598355410236

1Quantitative weighing and packaging scale instrumentOverview

The BMT-A105 intelligent digital display controller is connected to weighing sensors such as tension and pressure sensors, which measure and display in real time and output relays. It is used for automated batching and weighing to improve production efficiency. This product uses a 24 bit AD converter with high resolution and low temperature drift. The power input, signal input, and output are isolated from each other, effectively suppressing various series mode and common mode interferences and improving the stability and reliability of the product.

2、 Functional Features

24 bit AD acquisition, five digit digital display. Excitation 5V/100mA, connected to sensors with 5-15V excitation, can be connected to 4 sensors simultaneously.

User on-site calibration to improve the accuracy of instrument and sensor coordination. Weighing instruments connected to tension sensors/amplifiers, etc., with the function of removing skin and resetting to zero.

The collection speed can be set from 1 to 100 times per second to improve control accuracy. It has the function of automatically calculating and displaying peak and valley values.

Relay alarm, feeding and reducing control output. Optional voltage and current outputs can be used as transmission or control outputs.

3、 Connection of sensors

This monitor is compatible with all resistance strain sensors.

The output signal of the sensor is very weak. Please try to shorten the length of the signal cable as much as possible. It is forbidden to tie the signal cable together with the power line, otherwise the instrument may be interfered with.

The wiring of the sensor must be covered with a metal tube, and the metal tube must be reliably grounded. The metal tube mainly serves as a shield and protection.

The cable that comes with the sensor cannot be cut, and the sensor must be reliably connected to the wiring terminal. Poor contact will cause data to jump or be inaccurate.

Please do not use the excitation voltage of the instrument for other purposes, otherwise it may cause the instrument display value to jump.

4、 Main technical indicators

5Quantitative weighing and packaging scale instrumentProduct size, terminal wiring

The external dimensions are 160 × 80 × 125mm, with an opening of 152 × 76mm,; Reset start stop connection with self reset button switch

6、 Product selection

7、 DA analog transmission output/control output

The instrument can be equipped with mA/V analog output function, which can be set as either transmission output or control output according to user requirements.

In the advanced parameters (password 0838), dA=bS is the measurement value transmission output method. The instrument transmits the measurement value as a standard signal, and the output form is determined by the "bS" parameter. The measurement value transmission range is determined by the "bS-L" and "bS-H" parameters. If it is required to output 4.00mA at 0.00Kg and 20.0mA at 20.00Kg, then bS=4-20, bS-L=0.00, bS-H=20.000. When the instrument displays 10.00, it outputs 12.00mA. This function is used to transmit the weight value to other devices.

Another output method is dA=CtrL for control output, which can be used to control valve opening, adjust motor speed corresponding to frequency converter, etc., to achieve fast and slow feeding function. For example, when controlling the addition of 100kg of material and starting the feeding process below 80kg, the valve is fully opened (the motor is running at full speed). As the weight value increases to 80kg, the valve opening gradually decreases (the motor slows down). When reaching 100kg, the valve is only opened by 20%. Set bSL=105.00 and bSH=80.00 in the conventional parameters. Before and after starting the feeding process, the output is at its minimum, such as 4.0mA or 0V/1V. In this method, it is generally necessary to connect a relay to control the start and stop.

8、 Relay output/control instructions

9、 Communication instructions

(1) This product is equipped with RS232 and RS485 interfaces for direct communication with computers. The RS485 standard communication distance is 1.5km and can be connected to multiple instruments. The RS232 standard communication distance is 15m, and only one instrument can be attached. The TXD, RXD, and GND of the RS232 interface are respectively connected to the second, third, and fifth pins of the computer serial port. The data format consists of 1 start bit, 8 data bits, and 1 stop bit, and the checksum can be set. To avoid communication conflicts, the instruments are all in listening mode. The computer sends a command to a certain instrument at a specified address, and then waits for a period of time for the instrument to respond. After the instrument receives the correct command, it sends out the data. After sending, the instrument is in listening mode again. In the same system, instrument addresses cannot be the same, and baud rates must be consistent.

(2) Adopting the standard Modbus RTU communication protocol, using the 03, 04, and 06 function numbers. When using the configuration software touch screen, select a PLC with standard Modbus or Modicon (* * Kang) device, Modbus RTU address type, function number 3X or 4X can be used, register address starts from the first, data is a signed 16 bit integer, and when using Configuration King registers (i.e. 4x001, 4x000), other configuration software may start from 3x001 or 3x000. Users need to handle the decimal places according to their actual situation. It is recommended for user programming to define signed integer data, or by calculation. When the data is greater than 0X7FFF (decimal 32767), subtract the data from 65536 and then take a negative value. For example, if the communication transmission data is 0XFF9C (decimal 65436), 65536-65436=100, then take a negative value of -100. Professional algorithms can also use reverse addition 1. For long integer data such as data with high 16 bits and low 16 bits in the table, the data value is equal to the high-order x 65536+low order. During configuration, users can also select the data type as Long, and the system will automatically calculate the valid data value.