Functional Description26
3.7 Module Network
The ES511.1 module provides three downstream Ethernet interfaces for fur-
ther modules. Large blocks of measurement and interfaces modules can be
created as the modules can be cascaded.
ECUs that have an XETK or their own Ethernet interface can be connected
directly with a ES511.1 module and communicate with the calibration soft-
ware via XCP-on-Ethernet.
3.8 Time Synchronization
The ES51x modules provide a global clock pulse to compare the measurement
channels in a module network.
Modules connected to the “HOST” interface (e.g. ES510.1) can synchronize
the ES511.1 (SYNC-IN). If no synchronization signal is received at the “HOST”
interface, the ES511.1 acts as master module for synchronization.
The time synchronization unit of the ES51x master synchronizes the connected
modules via the Ethernet lines. The synchronization signal is relayed to con-
nected modules at the “ETH1”, “ETH2” and “ETH3” interfaces (SYNC-OUT).
The ES51x slave modules adapt to the clock pulse specified by the master mod-
ule.
The periodic synchronization signal is superimposed onto the Ethernet signals
without affecting data transfer. This excludes the possibility of a phase shift
between the individual measure signals, even when measurements are taken
from different modules.
The data of all connected modules of the ES4xx, ES51x and ES6xx lines is
acquired synchronously (ETAS device synchronization).
Note
The ES51x modules do not power the modules connected via Ethernet.
Every connected module must be wired separately to the power supply.
Note
Using Ethernet patch cables (1:1, twisted pair, Cat5) instead of sturdy Ether-
net cables with Neutrik connectors does not negatively affect time synchro-
nization.
Manual.book Seite 26 Montag, 13. Juli 2009 6:24 18
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