FOXBORO 0399071D 0303440C+0303443B Combination Control Board

FOXBORO 0399071D 0303440C+0303443B Combination Control Board

Product Overview

The FOXBORO 0399071D 0303440C+0303443B combination control board is an integrated control component specially designed by FOXBORO for industrial process control scenarios. It consists of the 0399071D motherboard, 0303440C signal conditioning module, and 0303443B drive output module. It is the core execution unit of FOXBORO’s classic control system. This combination control board is centered around the motherboard and integrates full process functions such as signal acquisition, logic operation, drive control, and fault diagnosis. It can achieve precise control and status monitoring of key equipment such as motors, valves, and pump sets in industrial production.

Its modular combination design ensures both functional integration and flexible maintenance and upgrade capabilities. The 0303440C module is responsible for precise conditioning and filtering of on-site signals, the 0303443B module is responsible for reliable output of control instructions and actuator drivers, and the 0399071D motherboard completes data computation and system collaboration. This product is widely used in the process control of industries such as petrochemicals, power generation, metallurgy and steel, water treatment, etc. It is seamlessly compatible with FOXBORO series I/O modules and upper monitoring systems, providing core guarantees for the stability and safety of industrial production.

Specification parameters

Module independent parameters

0399071D motherboard: The core processor is a 32-bit industrial grade MCU with a main frequency of 500MHz; Program storage 8GB Flash, data cache 1GB DDR3; Supports 8-channel module expansion interfaces, with a bus transmission rate of 10Mbps

0303440C signal conditioning module: 8 analog inputs, supporting 0-10V/4-20mA signals; Signal conditioning accuracy ± 0.05% FS; configurable filtering frequency (1Hz-1kHz); Equipped with thermocouple cold junction compensation function (accuracy ± 0.2 ° C)

0303443B driver output module: 6 digital outputs, relay type (AC 250V/8A, DC 30V/15A); Analog output 4 channels, 4-20mA current output, load capacity ≤ 800 Ω; Output response time ≤ 2ms

Common parameters – power supply

Power supply voltage: 24V DC (± 10% fluctuation allowed); Total power consumption: ≤ 30W; supports redundant power supply (switching time ≤ 5ms); Power protection: overcurrent, overvoltage, reverse connection protection

Common Parameters – Control Performance

Control cycle: minimum 2ms; supports algorithms such as PID, logic interlocking, and sequential control; Control accuracy: Analog quantity ± 0.1% FS, digital quantity has no error; Can simultaneously handle 16 independent control loops

Common Parameters – Environment

Working temperature: -20 ° C to+70 ° C; Storage temperature: -40 ° C to+85 ° C; Relative humidity: 5% -95% (no condensation); Vibration resistance: IEC 60068-2-6 (10-500Hz, 10g)

Common Parameters – Communication

Communication interface: 1 RS485, 1 Ethernet (10/100Mbps); Supporting protocols: Modbus RTU/TCP, FOXBORO proprietary communication protocol; Data transmission delay ≤ 10ms

Common Parameters – Safety and Physics

Safety certification: UL, CSA, CE; Protection level: IP20 (board level); Installation method: DIN rail or panel installation; Weight: Approximately 800g (complete set)

Performance characteristics

1. Modular collaboration and high integration

Adopting a combination architecture of “motherboard+functional module”, the 0399071D motherboard serves as the core coordination unit, achieving seamless data interaction with the 0303440C and 0303443B modules through an internal high-speed bus, avoiding signal loss and delay issues in a decentralized layout. The functional division of each module is clear, which can be deployed as a whole to achieve complete control functions, or replaced separately for faulty modules, reducing maintenance costs and downtime losses, and adapting to the flexible operation and maintenance needs of industrial sites.

2. High precision signal processing and control output

The 0303440C signal conditioning module is equipped with high-precision instrument amplifiers and programmable filters, which can suppress noise and perform linear correction on the analog signals collected on site. The signal conditioning accuracy reaches ± 0.05% FS, effectively improving the reliability of the original signal; The 0303443B drive output module adopts industrial grade power devices, with analog output linearity better than 0.1%. The digital output relay has arc suppression function to ensure the precise execution of control instructions and is suitable for process industries with strict control accuracy requirements.

3. Strong anti-interference and high reliability design

The motherboard and modules are designed with triple isolation (input-output power), and the common mode rejection ratio (CMRR) is ≥ 110dB@50 /60Hz， The differential mode rejection ratio (DMRR) is ≥ 80dB, which can effectively resist electromagnetic interference, power grid fluctuations, and grounding loop problems in industrial sites. The core components are selected from military grade products, which have undergone rigorous environmental tests such as high temperature, low temperature, and vibration. The average time between failures (MTBF) of the entire system exceeds 150000 hours, and it can still work stably in harsh environments such as high temperature and humidity.

4. Flexible compatibility and scalability

Compatible with mainstream control systems such as FOXBORO 700 series and I/A series, it can directly connect to existing industrial automation networks without the need for large-scale modifications to the upper system. The 0399071D motherboard reserves 8 module expansion interfaces. In addition to the standard 0303440C and 0303443B modules, it can also be extended to connect specialized modules such as temperature acquisition and pulse counting. It supports up to 24 input/output channel configurations and is suitable for control scenarios of different scales.

5. Comprehensive fault diagnosis and safety assurance

The motherboard is equipped with a comprehensive self diagnostic circuit that can monitor key parameters such as the working status of each module, power supply voltage, and bus communication in real time. When a module fault, signal abnormality, or power fluctuation is detected, the local LED alarm indicator is immediately triggered, and a fault code is sent to the upper system through the communication interface to clarify the fault location and type. At the same time, the system has an emergency stop interface, which can quickly cut off the output signal in case of serious faults, preventing equipment damage and safety accidents.

Working principle

The FOXBORO 0399071D 0303440C+0303443B combination control board has the core workflow of “signal acquisition conditioning operation instruction output state feedback”, and achieves closed-loop control of industrial processes through the collaborative cooperation of three major components. The specific principle is as follows:

1. Signal acquisition and conditioning stage

On site sensors (such as pressure and temperature sensors) or transmitters convert physical quantities into electrical signals and transmit them to the 0303440C signal conditioning module. The instrument amplifier inside the module amplifies weak signals, and the programmable filter filters out high-frequency noise and interference signals. At the same time, the cold end compensation function is activated for thermocouple input signals to eliminate the influence of environmental temperature on measurement. The conditioned signal is converted into a 16 bit digital signal by an AD conversion module and transmitted to the 0399071D motherboard through an internal high-speed bus.

2. Data operation and logical processing stage

The 32-bit MCU of the 0399071D motherboard receives the conditioned digital signal and executes preset control algorithms (such as PID and sequential control logic) based on the control settings issued by the upper system. The MCU adopts a multitasking scheduling mechanism to simultaneously handle the computational requirements of 16 independent control loops. By comparing the deviation between the measured value and the set value, the optimal control quantity is calculated. During the calculation process, the motherboard reads the status data of each module in real time to ensure the accuracy of the calculation results and the safety of the system operation.

3. Control instruction output and execution phase

The motherboard distributes the control instructions generated by computation to the 0303443B drive output module according to signal types. For actuators such as regulating valves and frequency converters, the module converts digital control signals into 4-20mA analog current signals for output; For equipment such as contactors and solenoid valves, the module outputs switch signals through relays to achieve start stop control. The output module is equipped with a built-in feedback detection circuit, which real-time collects the action status of the actuator, forms a control loop, and ensures the accurate execution of control instructions.

4. Communication interaction and fault monitoring stage

The motherboard interacts with the upper SCADA system and HMI devices through Ethernet or RS485 interface, uploads on-site measured data, equipment operating status, and fault information, and receives control parameters and operation instructions issued by the upper system. The self diagnostic circuit monitors the power supply voltage, signal integrity, and bus communication status of each module in real time. When an abnormality is detected, the alarm mechanism is immediately triggered, and dual prompts are provided through local indicator lights and upper alarm signals, making it easy for operation and maintenance personnel to quickly investigate and handle.