FOXBORO RH916DD

Technical Performance Specifications

1. Total Digital Input Channel Quantity: 16 independent digital input channels, all channels with complete galvanic isolation between each other and between the field signal side and the FBM bus communication side
2. Supported Field Input Signal Standard: 24VDC active high-level digital switch signal, signal recognition threshold: high level ≥18VDC, low level ≤5VDC
3. Channel Galvanic Isolation Voltage: 1500VDC between each input channel and between field signal loop and FBM bus communication circuit
4. Communication Bus Interface: Dedicated Foxboro FBM field bus communication interface, supporting automatic hot plug detection and communication heartbeat real-time monitoring
5. Power Supply Standard: Single 24VDC industrial DC power input terminal, built-in reverse polarity, overvoltage and surge multi-layer protection circuits
6. Single Channel Protection Mechanism: Each digital input channel is equipped with independent TVS transient voltage suppression diode and current-limiting resistance circuit to resist industrial field lightning surge and electromagnetic interference voltage impact
7. Operating Environmental Parameters
   • Operating Temperature Range: 0°C ~ +75°C
   • Storage Temperature Range: -45°C ~ +90°C
   • Vibration Resistance: Comply with IEC60068-2-6 industrial vibration standard
   • Humidity Resistance: 5%–95% non-condensing relative humidity
8. Functional Safety & Explosion Protection Grade: Ex Zone2 explosion-proof certified, SIL1 functional safety integrity level compliant
9. Physical Dimensions & Weight
   • Dimensions: 165mm (H) × 85mm (W) × 105mm (D)
   • Net Weight: 0.56kg
10. Protection Rating: IP20, only for installation inside sealed industrial control cabinets

Core Functional Features

1. 16-Channel Full Isolation Digital Input Design: All 16 digital input channels are completely electrically isolated from each other, and the field signal side and the FBM bus communication circuit side are also fully isolated; the electrical isolation structure completely eliminates the risk of cross-channel signal interference and reverse high-voltage damage to the module bus communication circuit caused by abnormal high voltage in a single field signal loop
2. High Anti-Interference Industrial Field Signal Acquisition Performance: Each input channel is equipped with independent transient voltage suppression and current-limiting protection circuits, which can effectively absorb instantaneous high surge voltage generated by industrial field lightning, high-power motor start-stop and frequency converter switching, and avoid misjudgment of digital switch signal state caused by strong electromagnetic interference noise
3. Real-Time Channel Signal State Continuous Upload Function: The module continuously collects the on-off high/low level state of each of the 16 digital input channels at a fixed 5ms sampling cycle, and packs all channel signal state data into standard FBM bus data frames to transmit to the RH100CP core control processor in real time, ensuring that the DCS control system can capture the instantaneous state change of field switch signals without delay
4. Continuous Real-Time Single-Channel Fault Diagnosis & Precise Fault Location Function: The module continuously monitors the loop voltage state of each of the 16 digital input channels during normal operation; once a single channel has an open-circuit disconnection fault, short-circuit grounding fault or abnormal overvoltage fault, the module immediately generates a precise single-channel fault code, packs it into the FBM bus data frame and uploads it to the RH100CP control processor, and lights the corresponding channel fault LED indicator on the front panel synchronously to remind on-site maintenance personnel of the specific faulty signal channel
5. Configurable FBM Bus Communication Loss Fail-Safe Diagnosis State: When the heartbeat signal communication between the RH916DD module and the RH100CP core control processor through the FBM field bus is lost for more than 3 seconds, the module automatically switches all 16 digital input channels to the pre-configured fixed fault diagnosis state (all channels default to low-level open-circuit state), and continuously uploads the communication loss fault alarm information to the control processor through the FBM bus until the bus communication heartbeat signal is recovered
6. Complete Power-On BIST Hardware Self-Test Function: After the 24VDC power supply is connected to the module, the module automatically runs the full BIST hardware self-test program; sequentially inspects the FBM field bus communication drive circuit, all 16 digital input channel signal acquisition circuits, multi-layer power supply protection circuits and channel fault diagnosis monitoring circuits; all hardware fault information detected during the self-test is immediately uploaded to the RH100CP control processor through the FBM bus, and the module general fault alarm LED indicator on the front panel is lit synchronously
7. Remote Online Firmware Program Upgrade Support: The module supports remote online update of the underlying firmware program through the FBM field bus by the RH100CP core control processor; the firmware upgrade process does not require cutting off the module power supply or removing the module from the DIN rail, and all 16 digital input channel wiring can remain connected during the upgrade process; if the firmware upgrade data packet transmission is interrupted abnormally, the module automatically rolls back to the original stable firmware program version to avoid module communication function failure
8. Independent LED Status Indication for Each Digital Input Channel: The front panel of the module is equipped with an independent small LED status indicator light for each of the 16 digital input channels; when the field switch signal connected to a certain input channel is at 24VDC high level, the corresponding channel LED indicator light keeps steady on; when the field switch signal is at low-level open-circuit state, the corresponding channel LED indicator light keeps off; maintenance personnel can quickly judge the real-time on-off state of each field switch signal through the front panel LED indicator lights without logging in to the central DCS operation monitoring station
9. Low Power Consumption Compact Industrial Cabinet Layout Design: The module adopts a compact small-size structural design, with a small occupied area of the DIN rail inside the control cabinet, supporting dense multi-module parallel installation layout; the whole module has ultra-low static operating power consumption, and will not generate excessive heat accumulation when multiple RH916DD modules are installed in parallel inside the sealed control cabinet, eliminating the hidden danger of module overheating and communication failure caused by heat accumulation
10. Hot Plug Fault Tolerant Detection Mechanism: The module integrates a dedicated FBM bus hot plug detection circuit; when the module is plugged into or pulled out of the FBM field bus wiring terminal under power-on state, the hot plug detection circuit immediately sends a module access/disconnection event notification data packet to the RH100CP core control processor through the FBM bus, and the control processor automatically marks the module offline/online state on the central DCS operation monitoring station interface synchronously