+86 13313703791
+86 13313703791
seren@ymgkplc.com
Description
ABB FI820F 3BDH000031R1 is a dual-channel serial communication module designed for the Freelance AC800F distributed control system. It provides two electrically isolated serial ports to establish serial data communication between AC800F controllers and external equipment such as transmitters, variable frequency drives, analyzers and remote terminals. The module supports Modbus protocol and multiple physical serial standards, enabling seamless interconnection with heterogeneous automation devices. It is widely used as replacement spare parts for legacy Freelance DCS plant maintenance.
Series
Freelance is ABB’s distributed process control platform for small and medium-scale process plants. AC800F is the core controller family, equipped with a full set of communication modules including Ethernet, PROFIBUS and serial interfaces to realize multi-protocol field device networking.
Product Features
- Dual independent serial channels, galvanically isolated from each other and the controller backplane.
- Supports RS232 full-duplex, RS422 full-duplex and RS485 half-duplex electrical interfaces.
- Compatible with Modbus RTU master and slave operating modes, supports hardware handshake signals RTS/CTS.
- Installed on AC800F controller rack slots F1–F4, powered via system backplane without external power supply.
- Front panel LED indicators for module running status, communication activity and fault diagnosis.
- Compact DIN-slot mounting structure, easy for on-site module replacement.
- Not RoHS compliant legacy hardware; only applicable for maintenance of existing Freelance systems.
Product Parameters
| Item | Details |
|---|---|
| Part Number | FI820F / 3BDH000031R1 |
| Brand | ABB |
| Series | Freelance AC800F DCS |
| Channel Count | 2 galvanically isolated serial channels |
| Interface Types | RS232, RS422, RS485 |
| Supported Protocol | Modbus RTU Master / Slave |
| Compatible CPU | PM802F, PM803F |
| Power Supply | 24VDC backplane powered |
| Dimension (W×H×D) | 28 mm × 155 mm × 125 mm |
| Weight | Approx. 0.145 kg |
| Operating Temperature | -20℃ ~ +70℃ |
| Storage Temperature | -40℃ ~ +85℃ |
| Humidity | 5–95% RH, non-condensing |
| Discontinued Status | Obsolete, spare-part only |
Product Specifications
- Installation: DIN slot mounted inside AC800F controller rack
- Certification: CE compliant
- Remark: Not recommended for new project design; requires matching Freelance engineering software version.
Function
- Establish serial communication links between AC800F DCS controllers and serial field equipment.
- Execute Modbus RTU data polling, collect field measurement data and transmit control commands.
- Provide electrical isolation between controller and field serial lines to reduce interference risks.
- Real-time communication status monitoring and fault diagnosis feedback to the control system.
Purpose
Serial communication gateway module for Freelance AC800F DCS, solving protocol interconnection requirements when connecting Modbus serial instruments and drives in process plants.
Application Fields
- Water & wastewater treatment Freelance DCS maintenance
- Chemical plant process control system retrofit
- Pulp and paper industry automation
- Thermal power plant auxiliary control system
- Legacy ABB Freelance AC800F site spare-part replacement
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