ABB FI820F 3BDH000031R1 is a serial fieldbus communication module designed for ABB Freelance Distributed Control Systems and AC 800F controllers.

The module provides two serial communication channels, allowing the AC 800F controller to communicate with external field devices, PLC systems, meters, drives, and third-party automation equipment.

With configurable RS232, RS422, and RS485 interfaces, FI820F offers flexible connectivity for industrial communication applications where serial protocols are required.

The module is commonly used as a replacement component in existing ABB Freelance DCS installations.

Technical Specifications

System Compatibility & Technical Background

ABB Freelance AC 800F Architecture

Typical configuration:

	

		

			

				

					

						

							

								

								
								

									

										

											

												

Field Devices
(Modbus / Serial Devices)
        ↓
RS232 / RS485 / RS422
        ↓
ABB FI820F
        ↓
AC 800F Controller
        ↓
ABB Freelance DCS
												
											
										
									
								
							
						
					
				
				

					

					
				
			
		
	

Main functions:

(1) Provide serial communication channels

(2) Connect third-party automation equipment

(3) Exchange process data with external devices

(4) Support Modbus communication

(5) Expand AC 800F communication capability

Compatible Systems & Related Components

ABB FI820F is mainly used with:

(1) ABB Freelance DCS

(2) ABB AC 800F Controller

(3) PM 802F Processor Module

(4) PM 803F Processor Module

(5) Serial field communication networks

Related ABB Products:

Replacement Information

ABB FI820F 3BDH000031R1 is commonly purchased for:

(1) ABB Freelance DCS maintenance

(2) Serial communication failure replacement

(3) AC 800F controller repair

(4) Legacy system spare stock

(5) Production downtime prevention

Before ordering:

(1) Confirm:

ABB FI820F

3BDH000031R1

(2) Verify:

• AC 800F controller model
• Current communication configuration
• Required serial interface type
• Connected field devices

Lifecycle Information

FI820F belongs to ABB Freelance AC 800F controller generation products.

Although newer ABB systems use updated communication architectures, many industrial facilities continue operating AC 800F-based control systems.

Therefore, FI820F remains an important maintenance spare for existing ABB Freelance installations.

Applications

Typical applications:

(1) Process Control

(2) Power Plant

(3) Chemical Industry

(4) Oil & Gas

(5) Industrial Equipment

Ordering Tips

Please provide:

(1) Model number

(2) Quantity

(3) System information

(4) Delivery location

(5) Required condition

Verification & Quality Control

Before shipment:

(1) Check ABB identification

(2) Inspect hardware

(3) Verify connectors

(4) Test communication function

(5) Prepare export documents

Related Models & Tags

Related Products:

• ABB FI810F
• ABB FI820F
• ABB FI830F
• ABB PM802F
• ABB PM803F

Related Tags:

ABB + FI820F + Serial Fieldbus Module + AC800F + Freelance DCS + Communication Spare Parts

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