Foxboro FBM207B P0914WH Contact Sense Input Interface Module

Foxboro FBM207B P0914WH

• Full Model: Foxboro FBM207B (Fieldbus Module 207B)

• Series: Fieldbus module of Foxboro I/A Series control system

• Application Scenarios: Analog input/output (AI/AO) signal processing in industrial process control, supporting redundant configuration. Suitable for scenarios with high reliability requirements in petroleum, chemical, power, and other industries.

Main Functions

• Multi-Channel Input: Equipped with 16 discrete input channels, which can be used as 16-channel DC voltage monitors or 16-channel contact sensors. Each channel can accept 2-wire input from a DC voltage source (FBM207) or a pair of contacts or solid-state switches (FBM207B/FBM207C).

• Wide Voltage Support: Supports discrete input signals under multiple voltages, including 15 to 60V DC (contact sensing), 120V AC/125V DC (voltage monitoring or switch input), and 240V AC (voltage monitoring or switch input).

• Signal Isolation: Each discrete input is isolated from other input channels and ground current, and group isolation with external excitation is used during operation.

• Signal Conversion and Processing: Performs signal conversion from electrical input signals of field sensors to redundant module fieldbus, and can also execute programs such as discrete input and ladder logic, with configurable options for pulse counting and event sequence input filtering time.

Redundancy Functions

• Configurable Redundancy: Can be used as a single unit or configured as a redundant pair (two FBM207B). In the redundant configuration, the module combination provides fieldbus module (FBM)-level redundancy. Field input signals received from a common point are fixed on the FBM backplane through the terminal components of the redundant adapter.

• Redundant Power Supply: The contact sensing power supply comes from the diodes of each module in the redundant adapter to ensure redundant power supply. The redundant digital Foxboro Evo™ control software combines information to verify each input/output module and uses the quality processed in the control strategy.

• Redundant Control Block: The redundant contact input function block CINR is used for each redundant input pair. The CINR block processes input reading and initializes logical redundant channels. The same reading is sent to both modules, making full use of the fieldbus and the logic circuit of each module.

Hardware Design

• Rugged Durability: Features a rugged extruded aluminum exterior for physical protection of the circuit, suitable for Class G3 (harsh) environments.

• Easy Maintenance: Visual indicators integrated into the front of the module provide the operating status of the fieldbus module and the discrete status of each input point. The module is easy to disassemble/replace without removing field device termination cables, power supply, or communication cabling. In redundancy, either module can be replaced without interfering with the good magnetic field input signal.

Communication and Installation

• Fieldbus Communication: Uses a redundant 2Mbps module fieldbus to communicate with modules or controllers, accepting communication from two paths (A or B). If one path fails or switches at the system level, the module can continue to communicate through the active path.

• Installation Method: The module is installed on a backplane on a DIN rail, accommodating up to four or eight fieldbus modules. The modular baseplate can be DIN rail-mounted or rack-mounted, including signal connectors for redundant module fieldbus, redundant independent DC power supply, and terminal cables. Redundant modules must be located in adjacent positions on odd and even baseplates.

Technical ParametersI. Electrical Parameters

• Power Specifications

• Supply Voltage: 24VDC ±10% (typical value)

• Power Consumption: Approximately 5W (no load), specifically varying with the number of channels used and the load.

• Signal Types and Ranges

• Analog Input (AI) Channels:

• 4-20mA (standard industrial signal)

• 0-10V DC (optional, requires configuration)

• Thermocouples (such as J, K, T, E types, etc., requiring external signal conditioning modules)

• Resistance Temperature Detectors (RTD, such as PT100, requiring external conditioning modules)

• Number of Channels: 8 isolated analog input channels

• Signal Ranges:

• Accuracy: ±0.05% FS (full scale), temperature drift ≤50ppm/℃

• Analog Output (AO) Channels:

• Number of Channels: 4 isolated analog output channels

• Signal Ranges: 4-20mA (default), 0-20mA, 0-10V DC (configurable)

• Output Drive Capability: ≥500Ω (current output), ≥10kΩ (voltage output)

• Accuracy: ±0.1% FS, temperature drift ≤100ppm/℃

II. Hardware Characteristics

• Physical Specifications

• Dimensions: Approximately 178mm (height) × 102mm (width) × 64mm (depth)

• Installation Method: Standard rail installation (complying with DIN EN 50022), supporting rack-mounted integration into the I/A Series system.

• Protection Level: IP20 (indoor use), requiring installation in a control cabinet.

• Isolation and Anti-Interference

• Inter-Channel Isolation: Each AI/AO channel is independently electrically isolated, with isolation voltage ≥500V D

III. Communication and Protocol

• Fieldbus Interface

• Communication Protocol: Redundant 2Mbps module fieldbus (Module Fieldbus), supporting real-time data interaction with I/A Series controllers (such as CP400).

• Communication Distance: The bus cable supports a maximum of 100m (unshielded) and can be extended via repeaters.

• Data Transmission

• AI: 16 bits + sign bit (corresponding to an accuracy of approximately 0.006% for 4-20mA)

• AO: 14 bits (corresponding to an accuracy of approximately 0.024% for 4-20mA)

• Sampling Rate: The maximum sampling rate for AI channels is 100ms/channel, and the update rate for AO channels is ≤50ms.

• Data Resolution

IV. Redundancy and Fault Handling

• Redundancy Configuration

• Supports dual-module hot redundancy (requires matching P0916QD adapter), with real-time data synchronization between primary and backup modules and a switching time<50ms.

• Power Redundancy: Can access dual 24VDC power supplies, supporting automatic power failure switching.

• Fault Detection and Diagnosis

• Self-Diagnosis Function: Real-time monitoring of power supply, channel, and communication link status, supporting LED indicator alarms (such as power failure, channel abnormality, communication interruption).

• Fault Types:

• Input open circuit/short circuit detection (AI channels)

• Output overload/short circuit protection (AO channels)

• Temperature over-limit alarm (triggered when the internal module temperature >70℃

V. Environmental Parameters

• Operating Temperature: 0-60℃ (no condensation)

• Storage Temperature: -40-85℃

• Humidity: 5%-95% RH (non-condensing)

Working Principle of Foxboro FBM207BI. Signal Acquisition and Preprocessing

1. Input Channel Configuration

• Voltage Monitoring Mode: Directly detects voltage signals of 15-60VDC, 120VAC/125VDC, or 240VAC (requires matching corresponding sub-models).

• Contact Sensing Mode: Detects the closing/opening status of dry contacts (such as relays, switches), requiring an external 15-60VDC excitation power supply.

• Channel Types: FBM207B provides 16 independent discrete input channels, each of which can be configured as:

• Electrical Isolation: Optocoupler isolation (≥500V DC) between channels prevents signal interference and fault diffusion.

2. Signal Conditioning and Digitalization

• Voltage Signal: The input voltage is divided and filtered, then compared with a preset threshold (such as 12VDC) through a comparator to convert it into a digital signal (high/low level).

• Contact Signal: The external excitation power supply forms a loop through the closed contact, and the module detects current changes and converts them into digital states.

• Filtering Mechanism: Built-in configurable digital filter (such as 1-100ms) eliminates false triggering caused by contact jitter or electromagnetic interference.

II. Signal Processing and Logic Operation

1. Microprocessor Control

• Collecting channel status data.

• Executing diagnostic programs (such as channel open circuit/short circuit detection).

• Synchronizing data with redundant modules.

• Responding to control system commands.

• Core Processing Unit: The module has a built-in microprocessor (such as Motorola 68HC11 series), responsible for:

2. Programmable Logic Functions

• Ladder Logic Execution: Supports simple logical operations (such as AND/OR/NOT), enabling local logic control within the module to reduce dependence on the main controller.

• Pulse Counting: Some channels can be configured as high-speed pulse counters (the maximum frequency depends on the model), used for measurements such as flow and rotational speed.

• Event Sequence Recording: Records the timestamp of events (with an accuracy of ms level) for fault backtracking analysis.

III. Communication and Data Transmission

1. Redundant Fieldbus Communication

• Periodic data updates (such as 100ms cycle).

• Event-triggered emergency data transmission.

• Reporting of module status and diagnostic information.

• Dual-Path Communication: Communicates with the control system through a redundant 2Mbps module fieldbus (A/B paths), supporting:

• Fault Switching: If the main path (such as path A) fails, it automatically switches to the standby path (path B) to ensure communication continuity.

2. Data Synchronization Mechanism

• Synchronization Between Redundant Modules: In the redundant configuration, the primary and backup modules synchronize input status and configuration information in real time through backplane communication to ensure no data loss during switching.

• Data Consistency Check: Adopts CRC check or timestamp comparison to ensure data consistency between primary and backup modules.

IV. Redundancy Management and Fault Handling

1. Redundancy Architecture Design

• Hot Standby Mode: The primary module (Active) processes input signals and outputs control instructions, while the standby module (Standby) synchronizes data in real time and is in a hot standby state.

• Automatic Switching: When the primary module detects a fault (such as power loss, processor abnormality), the redundant adapter (such as P0916QD) triggers switching, and the standby module takes over control within ≤10ms.

2. Fault Detection and Diagnosis

• Bus communication quality monitoring (such as packet loss rate, CRC error rate).

• Detection of heartbeat signal loss with the controller.

• Power Supply Monitoring: Detects whether the 24VDC power supply is within ±10%.

• Internal Temperature Monitoring: Triggers an alarm when over-temperature (such as >70℃).

• Channel Integrity Detection: Detects whether the channel is open or short-circuited by injecting test signals.

• Hardware Self-Test:

• Communication Diagnosis:

3. Fault Safety Response

• Status Maintenance: During switching, the standby module maintains the last received valid input status to avoid sudden changes in control logic.

• Alarm Mechanism: Sends fault alarms through module LED indicators (such as the red FAULT light) and system software (such as I/A Series Workbench).

V. Software Configuration and Parameter Setting

1. Configuration Tools

• I/A Series Configuration Studio: Configures through a graphical interface:

• Channel type (voltage/contact).

• Filtering time (such as 10ms).

• Signal threshold (such as voltage high/low level determination value).

• Redundancy mode (single module/redundant pair)

2. Dynamic Parameter Adjustment

• Online Modification: Supports modifying configuration parameters (such as filtering time) during operation without shutdown.

• Parameter Backup and Recovery: Configuration parameters are stored in non-volatile memory, supporting automatic recovery after module replacement.

VI. Typical Application Scenarios

• Industrial Automation:

• Monitoring the status of valve limit switches.

• Collecting motor start/stop signals.

• Detecting the status of safety light curtains/emergency stop buttons.

• Power System:

• Monitoring circuit breaker positions.

• Collecting the status of protection relay contacts.

• Input of transformer temperature switch signals.

• Process Control:

• Monitoring the contact status of liquid level high/low limit alarms.

• Collecting the status of pressure switches.

• Conditional input for sequential control logic.