Introduction of PWC Programmable Weighing Controller Technology

This paper introduces the modular design of the programmable controller developed by a weighing technology company and the characteristics of its application in harsh environment.

PWC (programmable weighing controller) is a weighing system with modular design and distributed structure, which can be widely used in all kinds of weighing sites.

The programmable weighing controller system has many functional modules, which are connected by bus technology.Users can choose appropriate functional modules according to the specific requirements of the weighing site to build a cost-effective system.

Programmable weighing controller includes: main control module MC700, digital quantity module DS700, analog quantity module AS700, weighing module TR700

Modular design:

Programmable weighing controller adopts modular design, flexible collocation, can complete small system, can also complete large system, like building blocks.Users can use according to the system requirements of high and low, flexible collocation, convenient to find the highest point of the combination of system performance and cost.

Distributed structure:

The PWC function modules are connected by bus, and the modules can be installed close to the equipment, reducing the on-site wiring, reducing the cost of use and maintenance, and improving the reliability of the system.

Easy installation:

Each function module of PWC is installed using DIN35mm guide rail, and the device adopts SMT production process. The size is small and light, and it is specially designed for weighing industry, in line with industry standards, and wiring becomes more simple.

Applicable environment is harsh:

PWC based on low power consumption of industrial embedded system, less heat, no fan cooling, not afraid of dust;Positioned for industrial weighing control, fully consider the temperature range of outdoor weighing control, can meet the application of multiple regions and temperature range.

Strong real-time performance:

PWC is based on embedded real-time operating system, with strong real-time data acquisition and control, fast response, not afraid of virus infection and other advantages.

Embedded real-time database with independent intellectual property rights:

The programmable weighing controller realizes the embedded real-time database with independent intellectual property rights on the high-speed embedded system.This enables PWC to have powerful data management and analysis capabilities, providing a supporting platform for the realization of the responsible weighing control algorithm.

Advanced control algorithms:

The programmable weighing controller adopts adaptive model predictive control algorithm, and has the function of self-learning control model and self-tuning control parameters.By making the controller learn the characteristics of the weighing system in the calibration stage of the weighing system, an accurate model reflecting the characteristics of the control system is established. Therefore, the control can be implemented in advance by predicting the control effect in the near future in the batching control. Thus, the following results can be achieved:

1) Accurate control, fast response and small overimpulse;

2) Stable control, small adjustment load, energy saving, prolong the service life of the equipment.

Openness:

The programmable weighing controller is open and supports the secondary development of users. The programming language uses the current popular logic control language, such as ladder diagram, instruction table and text language.Like in PLC or PC, according to the needs of PWC programming, so that PWC can meet a variety of different process requirements, more humanized.

PWC module is the main component of weighing system. At present, there are 8 modules with different function types, mainly including:

Main control module MC700

Integration of multi-specification software functions such as HMI, soft logic, single database, batching algorithm software.It is the core of the whole PWC system

Weighing module TR700

It is mainly used for weight measurement, and also includes 4-way switching input and 4-way switching output

AIO module

The module has two channels of 4 ~ 20mA analog input and analog output. The acquisition channel can collect sensors and equipment with 4 ~ 20mA output.The output channel can be used to drive control equipment, such as frequency conversion speed regulation, etc

AO module

With 4 channels of 4 ~ 20mA analog output

DO module

With 24 channel switching output, contact capacity of AC250V5A, DC30V5A switching output

DIO module

Contains 8 digital quantity input and 8 road digital output, it is mainly used for the switch quantity of input and output, input nodes connected devices passive contact (dry contact), such as button input, trip switch, proximity switch, etc., the output node is relay output, contact capacity of AC250V5A, DC30V5A, can drive the ac contactor, solenoid valve, etc

AI module

It has four analog input channels of 4 ~ 20mA, which functions the same as the input part of AIO module

DI module

Provide 24-way on-off input with the same contact type as the DIO module's input contact type

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