Configuration
EP31xx 81Version: 2.4
4.6.2 Operation modes
The EP31xx supports three different operation modes:
• Freerun [}82] (filter on, timer interrupt)
• Synchronous [}81] (filter off, SyncManager interrupt) and
• DC (DC-Sync-Interrupt)
Fig. 3: Relationship of operation modes
The module switches between the Freerun (filter on) and Synchron modes by activating/deactivating the filter
via the index. This takes place while the module is in OP mode. The changeover may result in longer
sampling times and step changes in the process data until the filters have assumed a steady state.
DC mode can only be used when the filters are switched off. Likewise, it is not possible to switch the filters
on in DC mode. The DC mode is parameterized via the DC tab in the TwinCAT System Manager.
Synchron mode
In synchronous operation process data are generated frame-triggered, so that a new value is available with
each PLC cycle. Synchronous mode is used automatically with the EP31xx modules (filter off, no DC). The
minimum cycle times are 80µs (EL31x1/EL31x2), and 120µs (EL31x4) for standard IPCs.
DC operation
In DC mode the analog sampling is triggered by DC-interrupt. As a result, the temporal jitter between two
frames is no longer important and the sampling point is the same across the entire system.
The "input-based" mode shifts the sync-interrupt in such a way that the process data are ready for collection
shortly before the current process data cycle.
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