ABB DCS AC800F PLC – The Field Controller


The ABB DCS AC 800F controller distributes process and diagnostic data from four fieldbus gateways. If required, it can also work with various fieldbus types – and this
is, of course, in addition to the usual tasks of a “conventional” controller. Thanks to its compact and sturdy design, the AC 800F is suitable both for installation in the control room and for use in junction boxes directly in the field.

The AC 800F controller has a modular structure. The CPU is designed as a backplane to which various modules – power supply units, Ethernet and fieldbus modules – can be attached in line with the application. On the fieldbus side, modules are available for:

  • MODBUS (master / slave, RTU or ASCII)
  • IEC 60870-5-101, IEC 60870-5-104
  • CAN for Freelance Rack I/O

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AC 800F – The Field Controller

Economical and reliable into the future

AC 800F offers new possibilities, combining “easy engineering” with an open and modern system architecture:

  • Availability: Redundancy at all levels
  • Freedom of Choice: PROFIBUS, FOUNDATION Fieldbus or HART; or combinations of those protocols
  • Efficient Engineering: Support for FDT/DTM
  • Only one tool for engineering, commissioning and diagnositics
  • Asset Optimization and batch processing
  • System engineering covers fieldbus and device configuration
  • On-board web server for remote diagnostics
AC800F Ordering information
AC800F Part No. Parameters IN STOCK
PM802F Include rack , CPU,8M Check Stock
PM803F Include rack , CPU,16M Check Stock
SA811F Field control equipment 220VAC-24VDC Check Stock
SD812F Field control equipment 24VDC-24VDC Check Stock
Ethernet module Check Stock
EI811F 10Base2 Module Check Stock
EI812F AUI Module Check Stock
EI813F 10Base T Module Check Stock
Other communication module Check Stock
FI810F CAN Module Check Stock
FI820F Modbus Module Check Stock
FI830F Profibus-DP V1 Module Check Stock
FI840F FF Module Check Stock
Accessory Check Stock
TK807F SA801F/SA811F service cable Check Stock
TK808F SA801F/SA811F service cable,Eur standard plug Check Stock
TK809F SA801F/SA811F service cable,USA standard plug Check Stock
TK802F SD802F service cable Check Stock
TK821F Serial interface communication cable,0.5m Check Stock
TK831F CAN communication cable,0.5m Check Stock
TK811F CAN communication cable,3m Check Stock
TK817F CAN communication cable,100m Check Stock
TK890F Diagnosis cable 5m Check Stock
TK891F Diagnosis cable 10m Check Stock
TB870F Communication wiring board Check Stock
AM811F Battery module Check Stock
AM895F(4) Front panel(4pcs in one bag) Check Stock
SB808F RAM back up battery (for EI8**Fmodule) Check Stock
SY809F Battery stents Check Stock
The ABB DCS AC 800F hardware

The ABB AC 800F has a modular structure. The AC 800F CPU is designed as a backplane to which various modules – power supply units, Ethernet or fieldbus modules – can be attached in line with the application. On the fieldbus side, modules for PROFIBUS-DPV1, FOUNDATION Fieldbus HSE, MODBUS (master/slave, RTU or ASCII), IEC 608 0-5-101 and CAN for Freelance Rack I/O are available. The fieldbus line and the connected PROFIBUS slaves are entirely configured and parameterized using the Control Builder F engineering tool. No further external tools are needed for configuration. PROFIBUS slaves can be integrated into the system using a GSD) file or FDT/DTM). In the case of FOUNDATION Fieldbus, configuration takes place using CFF or DD files. This allows fieldbus parameterization even without connected field devices.

Also Freelance Rack I/O can be connected to the ABB AC 800F, in which case a CAN module is used. This allows you to operate five I/O racks, with a total of around 1000 I/Os, for each AC 800F. The I/O racks are equipped with a link module and up to nine I/O modules and can be mounted separately at a distance of up to 400 m from the AC 800F.

AC 800F Fieldbus modules

The ABB AC 800F uses the fieldbus modules to collect and process real-time and diagnostic data. Up to four fieldbus modules can be mounted into one AC 800F.

The fieldbus modules have the following tasks and
• Electrical isolation between the process and system
• Status LEDs for the module status
• Independent fault detection and fault signaling
• Connection of the fieldbus lines

CAN module 1 Connection of up to 5 Freelance I/O racks
Serial module RS /RS4 /RS485 configurable for MODBUS, IEC 608 0-5-101 telecontrol protocol
PROFIBUS module 1 Full-value PROFIBUS DPV1 Master
FF-HSE module 1 For the connection of up to 10 LD 800HSE Linking Devices with 10/100 MBaud autosense twisted pair connection
Ethernet modules

Process stations and the operator and engineering level in the Freelance system communicate with each other via Ethernet.

Ethernet module 1 Twisted pair connection 10 base T for connection to hubs or switches
Ethernet module 1 BNC connection 10 base for thin coaxial cable (Cheapernet), 10 MBit/s
Ethernet module 1 AUI connection 10 base 5 and 10 base FL via coupler
ABB AC 800F functional range

The ABB AC 800F scope of functions provided by the Freelance system corresponds to the basic supply defined in IEC 61131-3, in addition to numerous other high performance, industry-proven functions and function blocks. They are accommodated in a function block library and can be supplemented by user-specific function blocks. While designing the station and during configuration, the processing capacity and speed of the process station can be easily adapted to the demands of the automation task. Program execution in the process station is based on a task-oriented, real-time multitasking operating system, leading to a flexible strategy for processing programs.
Different modes are available for task execution:

  • Cyclical processing with cycle times from 5 ms upward
  • Fastest-possible processing (PLC mode)

Along with the user tasks, system tasks – in which functions can also be processed – are automatically made available. These tasks are executed once in case of the following events:

  • RUN
  • STOP
  • WARM START (voltage restored)

Up to eight cyclic user tasks and one PLC mode task can be configured in a process station

Functions and Function Blocks
Analog value processing


  • Input and output conversion
  • Linearization -Delay and dead-time filter
  • Average/extreme value determination in time
  • Setpoint adjustment
  • Counter with analog input
  • Time scheduler
Binary value processing
  • Binary output, monostable
  • Input and output delay
  • Pulse/time counter, pushbutton
Closed-loop control
  • Continuous controllers
  • Step controllers
  • On/off controller, three-position controller
  • Ratio controller
  • Basic functions
  • Auto-tuning
Open-loop control
  • Individual drive functions
  • Sequence control, dosing circuits
Logic functions
  • Logic processing
  • Average/extreme value determination
  • Comparator, binary switch
  • Multiplexer -Converter (data type & code)
  • Flip-flop, edge detection
  • String blocks
  • radio controlled adjustment of daylight-saving time
  • Analog and binary monitoring
  • Event monitoring
  • Audible alarm control
  • Connection monitoring
  • Sequence-of-Events (SOE)
Acquisition Arithmetic functions
  • Disturbance course acquisition, trend acquisition
  • Basic arithmetic functions, numerical functions
  • Logarithmic functions
  • Trigonometric functions
  • Analog value and time limitation
Modbus functions PROFIBUS
  • Master and slave functions
  • DPV1 master functions for AC 800F
FOUNDATION Fieldbus (FF) Send/Receive
  • FF High Speed Ethernet (HSE/H1) for AC 800F
  • Send and receive blocks for inter-system communication
Phase logic processing
  • Interface module for batch applications

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