Designed specifically for scenarios without the need for independent relay output, this interface card focuses solely on signal transfer functions. It is widely compatible with various types of gas sensors, such as catalytic sensors and 4-20mA sensors. As a core component connecting the control unit and on-site detection equipment in industrial safety monitoring systems within fields like petrochemicals, metallurgy, and energy, it ensures that sensor signals are transmitted to the control system accurately and without interference, safeguarding the accuracy and real-time performance of gas concentration monitoring.

I. Core Functions and Positioning

1. Signal Transfer Between Sensors and Control Cards

As the "signal hub" of the 5701 Control System, the core role of the 05701-A-0326 Field Interface Card is to establish physical and electrical connections between single-channel control cards (e.g., 4-20mA input type 05701-A-0301, catalytic input type 05701-A-0302) and on-site gas sensors:

• It receives signals output by sensors (such as S/NS/01 signals from catalytic sensors and current signals from 4-20mA sensors) and transmits them accurately to the corresponding single-channel control cards through internal circuits, ensuring no signal attenuation or interference;
• It provides necessary power supply circuit interfaces for sensors (e.g., +24V DC power obtained from the system) to meet the operating voltage requirements of different types of sensors, eliminating the need for additional external power modules.

This interface card has no built-in relays and focuses solely on signal transfer. It is suitable for scenarios in the system where "main relays" are used for centralized control of alarm output (e.g., multiple channels sharing a set of alarm relays), or for simplified monitoring systems that do not require independent channel relay output.

2. Basic Electrical Protection and Interference Shielding

To ensure the stability of signal transmission and equipment safety, the 05701-A-0326 Field Interface Card integrates multiple basic protection designs:

• Ground Protection: Equipped with dedicated GROUND terminals (Terminals 25/26), which can be connected to the shielding layer or steel armor of sensor cables. This effectively suppresses Radio Frequency Interference (RFI) and Electromagnetic Compatibility (EMC) issues, complies with European electromagnetic compatibility standards such as EN 50270:2006, and prevents signal fluctuations or false alarms caused by interference;
• Terminal Compatibility: Supports the connection of solid or stranded wires with a maximum cross-sectional area of 2.5mm². The terminal design is compatible with cable specifications commonly used in industrial sites, ensuring firm wiring and easy plugging/unplugging during maintenance;
• Signal Isolation: Through optimized circuit layout, crosstalk between sensor signals and power supply circuits is reduced, ensuring accurate transmission of low-current/low-voltage sensor signals (e.g., weak 4-20mA current).

3. Remote Control Signal Input

In addition to sensor signals, this interface card also supports the input of external remote control signals, providing the system with a flexible remote operation interface:

• Remote Inhibit: A remote inhibit signal is input through Terminal 33 (Remote Inhibit In). During system maintenance, sensor calibration, and other scenarios, the alarm output of the corresponding channel can be temporarily shielded remotely to avoid false triggers;

• Remote Reset: A remote reset signal is input through Terminal 34 (Remote Reset In). After the system triggers an alarm or fault prompt, the alarm status can be reset remotely without on-site operation, improving operation and maintenance efficiency.

The activation voltage of the remote input signal must maintain a value > 2V relative to the system's 0V reference point, with a maximum input voltage not exceeding 32V and an input current < 5mA, ensuring compatibility with external control equipment (e.g., PLCs, remote control cabinets).

Technical Specifications and Hardware Parameters

Application Scenarios and System Compatibility

1. Core Application Scenarios

• Multi-channel systems with main relay control: When the 5701 Control System adopts a "main relay card" (such as the 05701-A-0330 High-Integrity Relay Card) to centrally manage the alarm output of all channels, the 05701-A-0326 can serve as a signal transfer card for non-main channels. It only undertakes sensor signal transmission, simplifying system configuration and reducing costs;
• Simplified gas monitoring systems: For single-gas monitoring (e.g., carbon monoxide, methane) in small warehouses and laboratories, independent channel relays are not required. Only sensor signals need to be transmitted to the control card to realize concentration display and alarm prompts, and this interface card can meet basic signal transfer needs;
• Scenarios with remote operation and maintenance requirements: In scenarios where "remote inhibit/reset" needs to be implemented via PLC or remote control cabinets (e.g., unattended pump rooms, storage tank areas), the remote signal interface of the interface card can improve the flexibility of system operation and maintenance.

2. System-Compatible Components

• Mandatory components: Must be used in conjunction with the single-channel control cards (05701-A-0301/05701-A-0302), DC input card (05701-A-0325), and engineering card (05701-A-0361) of the 5701 Control System; none of these components can be omitted;
• Sensor driver modules: Corresponding sensor driver modules must be matched according to the sensor type — catalytic sensors are paired with 05701-A-0284, and 4-20mA sensors are paired with 05701-A-0283. The driver modules need to be pre-installed on the single-channel control cards;
• Auxiliary components: If analog output function is required, the 05701-A-0285 analog output module must be added to the single-channel control card; if centralized alarm is required, relay cards such as 05701-A-0327 (Dual SPCO) and 05701-A-0330 (High-Integrity) need to be matched as main relays.

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