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Product Spotlight: Micro DCS - Small to Midrange Process Control
ABB Freelance 800F: Compact Process Control System
I recently had the opportunity to review the newest hardware and features of the ABB Freelance control system and it is an impressive Micro DCS product. The ABB Freelance control system meets the needs of small to midrange process applications where a large DCS is not required. The Freelance system has its roots on the original Hartmann & Braun Freelance product, but with significant ABB investments to improve the system. ABB is committed to continuously improving and enhancing Freelance to meet user's changing needs.
Engineers evaluating possible solutions for small to midrange applications will do well to consider the Freelance system. The Freelance system combines easy engineering with open system architecture. ABB describes Freelance as a small footprint DCS for small to medium sized plants in the process industry and for applications requiring DCS functionality in a compact system with intuitive and efficient engineering tools.
Freelance is scalable from small to large system (click images below to enlarge them).
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Freelance system enhancements have embraced open architecture with a fieldbus centered architecture supporting PROFIBUS PA, PROFIBUS DP, HART, and Foundation Field bus. Using the AC800 controllers systems can be configured for full redundancy.
The ABB Panel 800 family of displays provides options to meet a wide range of operator interface requirements. There are 5 touch panel displays ranging from 4 to 15 inch displays and 4 function key panel displays with screens up to 10 inches.

Control Builder F engineering software is used to configure the systems and the DigiVis operator console software is used for HMI. Key software features include:
- Integrated Alarm and Message Handling
- Readymade Faceplates per Tag
- Integrated Configuration – Database
- Cross References
- Extended SFC-Control (Start, Resume, Monitor, Wait, …)
- Trending, Historian and Archiving
- Redundancy Option
- Integrated Control System Diagnostics
- System Level Diagnostics
- Easy Configuration, 3D Libraries & Pre-defined Displays
- Trend/Archive Analog and Digital Process Variables
- Historian
AC 700
The AC 700 is the newest field hardware that is based on ABB’s proven AC 500 hardware platform. The AC 700 has I/O modules with detachable terminal units and can support up to 8 I/O modules. The AC 700 processor is a Motorola Power PC and can be configured with up to 2 MB Battery-backed SRAM, 8 MB SDRAM and 4 MB FLASH memory. The unit has a local display for control and diagnostics, 1 Ethernet Port, and two RS-232/485 ports. The initial I/O modules available support:
- Digital Inputs: 24 volt DC
- Digital Outputs: 24 volt DC
- Analog Inputs: Milliamp, Voltage, and RTD
- Analog Outputs: Milliamp and Voltage

Application Engineering Advantages
- Single database for all controllers
- Quickstart Computer Based Training on DVD
- S88 batch control only requires user to configure it for applications
- Diagnostics in DigiVis Monitor Field Equipment Health
- OPC Interface
- IEC 61131-3 Language Standard
- Control Builder supports FDT simplifying engineering and commissioning
- Time synchronization of nodes with master
- Pre-engineered displays
- SOE option card for rack based I/O with 2millisecond resolution
- Redundancy Options
Is it a PAC?

