# Working with synchronized tightening

For Power Focus 6000 and PF8 controllers it is possible to connect several controllers together and run synchronized tightenings. The first controller in the configuration is called the Sync Reference and handles all the tightening and data reporting. Up to 5 additional controllers can be connected to the Sync reference through cable and are called Sync Members. Their only function is to control the tools.

## Sync Reference

The Sync Reference is the brain in the system. It controls:

- the tightening settings

- the data reporting

- the configuration of the complete system

- the connection to Tools Talk and ToolsNet

Accessories and field buses are connected directly to the Sync Reference.

## Sync Member

The Sync Member works as a drive without any extra functionality. The IT part does not run and it is not possible to connect any external accessories or protocols to the Sync Member. Each Sync Member has an assigned channel number (2-64). The channel number is used to:

- identify a connected tool and drive within the Hardware Layout Configuration in ToolsTalk 2.

- produce result reports.

- identify faulty parts in error events.

## Tightenings

It is only possible to run Multistep tightening programs. To synchronize tightenings between each tool, synchronization points are used. At these points, the tools wait for each other before continuing with the next step in the tightening program. A tightening program can contain up to 25 steps (synchronization points not included). No repair or termination paths are allowed.

Controller features, such as the Low Reaction Tightening Strategies and controller-wide functions among others, require licenses distributed through the Functionality Management System (FMS). Whereas configuration of features is possible without specific licenses, the assignment and use of those features will require the correct license to be installed on the controller. Please refer to Licenses (FMS) for more detailed information on licenses.