FOXBORO RH916XG

Technical Performance Specifications

1. Analog Input Channel Quantity: 16 independent fully galvanic isolated universal analog input channels, mutual channel isolation and complete electrical isolation between field loops and FBM bus digital circuits
2. Supported Analog Signal Types: 4–20mA two-wire/three-wire current signal, 0–10V DC voltage signal; each channel independently switches signal input mode through DCS remote configuration
3. Channel Galvanic Isolation Voltage: 1500VDC isolation between each analog input channel and between field analog signal loops and FBM bus communication circuits
4. Analog Sampling Precision: Full scale measurement accuracy ±0.05%FS, minimum sampling resolution 0.001mA / 0.0001V
5. Sampling Cycle: Fixed 8ms full-channel synchronous sampling cycle
6. Communication Bus Interface: Dedicated Foxboro FBM field bus interface, with automatic hot-plug detection function and 100ms cycle communication heartbeat real-time monitoring mechanism
7. Power Supply Standard: Single-channel 24VDC industrial DC power input terminal, built-in multi-layer overvoltage, undervoltage, reverse polarity and lightning surge impact protection circuits
8. Single Channel Protection Mechanism: Each universal analog input channel equipped with independent TVS transient voltage suppression diode and self-recovery fuse overcurrent protection circuit to resist instantaneous high voltage surge interference generated by field lightning, high-power motor startup and frequency converter switching
9. Environmental Operating Parameters

• Operating Temperature Range: 0°C ~ +75°C
• Storage Temperature Range: -45°C ~ +90°C
• Vibration Resistance: Comply with IEC60068-2-6 industrial heavy vibration standard
• Humidity Resistance: 5%–95% non-condensing relative humidity

10. Safety Certification Grade: Ex Zone2 explosion-proof certified, SIL1 functional safety integrity level compliant
11. Physical Dimensions & Weight

• Dimensions: 165mm (H) × 85mm (W) × 105mm (D)
• Net Weight: 0.59kg

12. Protection Rating: IP20, only applicable for installation inside sealed industrial control cabinets

Core Functional Features

1. 16-Channel Full Isolation Universal Signal Independent Configuration Design

   All 16 universal analog input channels adopt complete mutual electrical isolation and field-bus side isolation structure. Each channel supports independent free configuration of 4–20mA current mode or 0–10V voltage mode without unified group restrictions, realizing mixed collection of current and voltage analog signals from different field transmitters on a single module. Full galvanic isolation design completely eliminates cross-channel analog signal crosstalk interference risks and single-channel abnormal high voltage reverse damage to FBM bus digital communication circuit faults.

2. Dual-Mode Signal Automatic Recognition & Remote Switching Function

   The module integrates built-in signal loop impedance detection circuits for each channel. The circuit automatically identifies whether the field connected transmitter outputs a current signal or voltage signal after power-on. Users can remotely switch each channel’s signal acquisition mode through the central DCS operation station without modifying on-site wiring or replacing module hardware.

3. Ultra-High Precision Analog Signal Sampling Performance

   Each universal analog input channel is equipped with an independent 24-bit high-resolution analog-to-digital conversion chip. The full-scale measurement accuracy reaches ±0.05%FS, and the minimum sampling resolution is 0.001mA for current signals and 0.0001V for voltage signals, fully meeting high-precision monitoring and closed-loop regulation requirements of industrial flowmeters, pressure transmitters and liquid level sensors.

4. Fixed 8ms Cycle Real-Time Analog Data Continuous Upload Function

   The module executes full 16-channel universal analog signal synchronous sampling operation at a fixed 8ms sampling cycle, converts analog current/voltage signals into calibrated engineering unit values (t/h, MPa, m, etc.), packages all channel real-time analog data into standard FBM bus data frames and transmits them to the RH100CP core control processor in real time, realizing delay-free real-time tracking of rapid changes in industrial process parameters.

5. Independent Single-Channel Real-Time Fault Diagnosis & Precise Fault Location Function

   Dedicated hardware monitoring circuits continuously detect the loop state of each universal analog input channel during normal module operation. Once single-channel transmitter open-circuit disconnection fault, short-circuit grounding fault, overvoltage input fault or overcurrent burnout fault is detected, the fault diagnosis circuit generates a unique independent fault identification code for the faulty channel. Fault codes are uploaded to the RH100CP main controller via the FBM bus, and the corresponding channel fault LED indicator on the module front panel lights up to guide on-site maintenance personnel to quickly locate the faulty transmitter wiring channel without complicated circuit inspection work.

6. Configurable FBM Bus Communication Loss Fail-Safe Analog Diagnosis Value

   When communication heartbeat packet exchange between the RH916XG module and RH100CP main controller via the FBM field bus is interrupted for more than 3 consecutive seconds, the internal fail-safe logic circuit locks all 16 universal analog input channels to user pre-configured fixed fault diagnosis analog values. The module continuously uploads bus communication loss fault alarm data packets to the RH100CP main controller through the FBM bus until normal heartbeat signal transmission resumes stable connection state.

7. Complete Power-On BIST Hardware Self-Test Function

   After single-channel 24VDC industrial DC power supply is connected to the module power terminals, the module automatically executes a complete full-range BIST hardware self-test program. The self-test sequentially verifies the FBM field bus communication drive circuit, all 16-channel universal analog-to-digital conversion acquisition circuits, multi-layer power supply overvoltage/reverse polarity/surge protection circuits and single-channel loop fault diagnosis monitoring circuits. All hardware fault information detected during self-test execution is immediately uploaded to the RH100CP core control processor via the FBM field bus, and the module public general hardware fault alarm LED indicator on the front panel lights up synchronously to remind maintenance personnel of module internal hardware abnormal faults.

8. Remote Online Firmware Program Upgrade & Channel Signal Parameter Batch Configuration Support

   Supports two types of remote online configuration operations initiated by the RH100CP core control processor via the FBM field bus: underlying firmware program full update, batch independent signal type switching and engineering range calibration parameter modification for all 16 channels. Firmware upgrade and parameter batch modification processes do not require module power-off or DIN rail disassembly operations; all field analog transmitter signal wiring can remain connected during remote configuration execution processes. If firmware data packet transmission or parameter configuration data transmission is abnormally interrupted, the module automatically rolls back to the original stable firmware program version and original channel analog signal calibration parameter set to avoid module analog signal acquisition function failure faults caused by incomplete configuration update operations.

9. Channel Independent LED Status Indication Design

   The front panel is equipped with an independent small LED indicator light for each of the 16 universal analog input channels: the LED stays steadily lit when the field analog transmitter loop is in normal closed circuit state; the LED flashes an alarm light when a single-channel transmitter open-circuit disconnection fault, short-circuit grounding fault or overcurrent fault occurs; the LED remains off when the channel is not configured with an analog signal type and is unused. Maintenance personnel can quickly judge the real-time operating state and fault alarm state of each field analog process sensor through the front panel LED indicator lights without logging into the central DCS operation monitoring station to view analog data and fault alarm records.

10. Compact Low Power Consumption Cabinet Layout Design

    Compact small-size structural design occupies small DIN rail installation space inside industrial control cabinets, supporting dense multi-module parallel installation layouts to realize centralized large-scale analog process signal collection functions with limited cabinet internal space resources. The entire module adopts an ultra-low static operating power consumption circuit design; excessive heat accumulation phenomena will not occur when multiple RH916XG modules are installed in parallel inside sealed control cabinets, eliminating hidden dangers of module overheating, analog-to-digital conversion sampling precision drift and FBM bus communication signal transmission failure faults caused by heat accumulation.