The FBM218 is a robust and reliable redundant output interface module designed to support a mix of standard 4 to 20 mA and HART digital communication signals. It offers eight channel-isolated output channels that enable highly flexible integration into industrial systems, supporting a variety of HART field devices with redundancy at the Fieldbus Module (FBM) level.
Key Features
- Output Channels:
- 8 isolated output channels supporting:
- Standard 4 to 20 mA analog output signals.
- Digital HART Frequency Shift Keying (FSK) signals superimposed on the 4 to 20 mA output.
- Redundancy:
- Module pair provides redundancy at the FBM level for continuous operation. One module acts as the Master, and the other as the Tracker.
- HART Communication:
- Dedicated FSK modem per output channel for bi-directional communication with HART field devices.
- Supports HART universal, common practice, and device-specific commands (without burst communication mode).
- Galvanic Isolation:
- Channel-to-channel isolation and isolation from ground and module logic to ensure safe and noise-immune operation.
- High Accuracy:
- Analog accuracy of ±0.05% of span between 4 mA and 20 mA.
- 13-bit resolution for fine output control.
- Maximum Rate of Change: 20 mA in 60 milliseconds.
- Compact and Rugged Design:
- Enclosure suitable for Class G3 (harsh) environments, adhering to ISA Standard S71.04.
- Termination Assemblies (TAs):
- Local or remote field wiring connections supported through flexible TAs.
Functional Specifications
| Specification |
Details |
| Field Device Channels |
8 isolated output channels, configurable for analog or HART signal outputs |
| Supported HART Versions |
Compliant with HART v5, v6, or v7 protocols |
| Communication Mode |
Point-to-point, master/slave, asynchronous, half-duplex, 1200 baud |
| Error Checking |
Parity on each byte and 32-bit CRC error checking on messages |
| Output Accuracy |
±0.05% of span (between 4 mA and 20 mA) |
| Output Load |
750 Ω maximum |
| Maximum Rate of Change |
20 mA in 60 milliseconds |
| Output Resolution |
13 bits |
| Maximum Distance (FBM218 to Device) |
Up to 3030 meters (10,000 ft), compliant with HART FSK physical layer specification |
| Loop Power Supply Protection |
Galvanically isolated, current-limited, and voltage-regulated |
| Fieldbus Communication |
Redundant 2 Mbps HDLC communication to associated FCM or FCP |
| Power Supply |
24 V DC ±5% (redundant), 7 W maximum power consumption |
| Heat Dissipation |
5 W maximum |
Environmental Specifications
| Operating Conditions |
Module |
Termination Assembly |
| Temperature |
-20 to +70°C (-4 to +158°F) |
PVC: -20 to +50°C (-4 to +122°F) |
| Humidity |
5% to 95% (non-condensing) |
5% to 95% (non-condensing) |
| Altitude |
-300 to +3000 m (-1,000 to +10,000 ft) |
-300 to +3000 m (-1,000 to +10,000 ft) |
| Storage Conditions |
Module |
Termination Assembly |
| Temperature |
-40 to +70°C (-40 to +158°F) |
-40 to +70°C (-40 to +158°F) |
| Humidity |
5% to 95% (non-condensing) |
5% to 95% (non-condensing) |
| Altitude |
-300 to +12,000 m (-1,000 to +40,000 ft) |
-300 to +12,000 m (-1,000 to +40,000 ft) |
Mounting and Physical Specifications
| Mounting |
Details |
| Module Mounting |
Mounts on a baseplate; can be mounted on a DIN rail (horizontally or vertically) or a 19-inch rack. |
| Termination Assembly Mounting |
Mounts on DIN rail (32 mm or 35 mm). |
| Dimensions |
Module |
Termination Assembly |
| Height |
102 mm (4 in) |
– |
| Width |
45 mm (1.75 in) |
– |
| Depth |
104 mm (4.11 in) |
– |
| Weight |
284 g (10 oz) |
Compression: 181 g (0.40 lb)
Ring Lug: 249 g (0.55 lb) |
Part Numbers and Accessories
| Part Number |
Description |
| P0922VW |
FBM218 Module |
| P0916QD |
Redundant Adapter |
| Termination Assemblies |
See “Functional Specifications – Termination Assemblies” for details |
| Termination Cables |
Up to 30 m (98 ft), materials: Polyurethane or Low Smoke Zero Halogen (LSZH) |
Field Termination Connections
| Connection Type |
Wiring Sizes |
| Compression-type |
0.2 to 4 mm² / 24 to 12 AWG |
| Stranded with Ferrules |
0.2 to 2.5 mm² with or without collar |
| Ring Lug |
#6 size connectors (0.375 in) for 0.5 to 4 mm² / 22 AWG to 12 AWG |
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