Fig. 17 Pc Is Sync Master - Beckhoff FC3102 Documentation

FC310x as master
1. Set FC310x to operation mode "DP/MC (equidistant)".
2. Append box "Siemens AG, Profidrive MC".
3. Adjust 611U station address ("PROFIBUS" box tab).
4. Append axis (or 2 axes for 611U with 2 axes) to NC task, select axis type "continuous axis".
5. Link axis (or axes) with 611U (select axis type "ProfiDrive MC" in the "Settings" axis tab, then link with
611U; for a 2-axis 611U, both axes have to be linked, otherwise a 611U error will occur).
6. Press the "Calculate Equi-Times" button on the "FC310x" tab at the FC310x.
7. Save project in the registry and start TwinCAT. The 611U should now change to RUN, the axis can be
operated via the NC online menu.
Should this not be the case, check the following:
• DpState of the 611U in TwinCAT is 2: Check 611U station address.
• DpState of the 611U in TwinCAT is 5: Check whether the correct PROFIBUS module is inserted at the
611U.
• DpState of the 611U in TwinCAT is 7: Check whether P922 is set to the correct standard telegram
(according to the ProcessData tab for 611U in the System Manager).
• DpState of the 611U in TwinCAT is 0, but 611U still does not change to RUN: Check the 611U
firmware version; for firmware versions below 3.4.3, 611U synchronization errors (error 597 or 598) can
only be rectified via a hardware reset of the 611Us, otherwise look up the error code in the Siemens
manual.
If several 611Us are configured, the equidistant times may have to be adjusted (see below).
DP/MC Equidistant Mode
In order to operate the FC310x with PROFIBUS MC, the Operation Mode "DP/MC (equidistant)" must be
set on the tab "FC310x" (for TwinCAT 2.8 [} 40] or TwinCAT 2.9 [} 48]) of the master. Whichever task uses
the equidistant functionality of the FC310x (usually the NC task) should have the highest priority, as
otherwise the synchronicity can be disturbed. Additionally, the Sync Mode can be selected. This specifies
where the synchronization signal is generated.
Disabled (PC is Sync Master)
The synchronization signal is generated by the PC, the FC310x synchronizes itself with the PC (PROFIBUS
cycle jitter approx. 2-4 µs).
Fig. 17: PC is Sync Master
The NC Access Time specifies by how much the PROFIBUS cycle is shifted towards the TwinCAT cycle,
the PLL Sync Time should be set to approx. 10% of the NC-Access-Time (max. 50 µs).
Sync Slave
The synchronization signal comes from another device, whose Sync mode must be set to "Sync Master".
The connection between the sync master and the sync slave is made through a hardware link. This is only
supported as from FC310x hardware version 4 and firmware version 3.00. No times have to be set.
26 Version: 3.0 FC3101 and FC3102