Product Description
Product Overview
The FBM218 (P0922VW) Communication Redundant Output Module provides eight isolated channels that support HART® protocol and/or 4-20 mA outputs, selectable per channel. The module ensures redundant operation, maintaining continuous plant functionality even in case of failure, with simple maintenance replacement.
This module has been superseded by RH922VW but retains compatibility within Foxboro control systems.
Technical Specifications
Field Device Channels
|
Parameter |
Specification |
|---|---|
|
Supported HART Instrument Types |
Compliant with HART Version 5, 6, or 7 |
|
Interface |
8 isolated output channels |
|
Communication Type |
Point-to-point, master/slave, asynchronous, half-duplex, 1200 baud |
|
Error Checking |
Parity on each byte, 32-bit CRC error checking per message |
|
Speed |
2 messages per second |
|
Fastest Allowed ECB Block Period |
100 ms (optimal loading determined by system sizing guidelines) |
|
Maximum Distance (FBM218 to Device) |
Up to 3030 m (10,000 ft), per HART FSK physical layer specification HCF_SPEC-54, Rev. 8.1 |
Current Output Specifications
|
Parameter |
Specification |
|---|---|
|
Analog Accuracy (Includes Linearity) |
±0.05% of span (between 4 mA and 20 mA) |
|
Output Load |
750 Ω maximum |
|
Maximum Rate of Change |
20 mA in 60 milliseconds |
|
Resolution |
13 bits |
|
Loop Power Supply Protection |
Each channel is galvanically isolated, current-limited, and voltage-regulated. Normal output current: 0-25 mA Maximum current (FET short): Up to 100 mA |
Isolation & Protection
|
Parameter |
Specification |
|---|---|
|
Channel Isolation |
Galvanically isolated (both optical and transformer isolation) from each other, ground, and module logic |
|
Withstand Voltage |
600V AC applied for 1 minute between isolated channels and ground |
|
CAUTION |
Not designed for permanent connection to high voltages—exceeding limits may pose an electrical safety hazard. |
Fieldbus Communication
|
Parameter |
Specification |
|---|---|
|
Communication Type |
Redundant 2 Mbps HDLC fieldbus |
Power Requirements
|
Parameter |
Specification |
|---|---|
|
Input Voltage (Redundant) |
24V DC (+5% / -10%) |
|
Power Consumption |
7W (maximum) |
|
Heat Dissipation |
5W (maximum) |
Calibration
• Calibration of the module and termination assembly is not required.
Physical Specifications
|
Parameter |
Specification |
|---|---|
|
Module Weight |
284 g (10 oz) approx. |
|
Termination Assembly Weight |
181 g (0.40 lb) approx. |
|
Module Dimensions |
Height: 102 mm (4 in) Height (with mounting lugs): 114 mm (4.5 in) Width: 45 mm (1.75 in) Depth: 104 mm (4.11 in) |
Environmental Specifications
Operating Conditions
|
Parameter |
Specification |
|---|---|
|
Module Temperature |
-20 to +70°C (-4 to +158°F) |
|
Termination Assembly Temperature (PA) |
-20 to +70°C (-4 to +158°F) |
|
Relative Humidity |
5 to 95% (non-condensing) |
|
Altitude |
-300 to +3,000 m (-1,000 to +10,000 ft) |
Storage Conditions
|
Parameter |
Specification |
|---|---|
|
Temperature |
-40 to +70°C (-40 to +158°F) |
|
Relative Humidity |
5 to 95% (non-condensing) |
|
Altitude |
-300 to +12,000 m (-1,000 to +40,000 ft) |
Other Specifications
|
Parameter |
Specification |
|---|---|
|
Contamination Resistance |
Suitable for Class G3 (Harsh) environments, as per ISA Standard S71.04 (tested per EIA Standard 364-65, Class III) |
|
Vibration Resistance |
7.5 m/s² (0.75 g) from 5 to 500 Hz |
