HBM MX440B - Page 28

Introduction
28 I3031-14.0 HBM: public Quantum
X
surements are to be performed by different measurement
systems, an external master must be used for synchro
nization.
This is also a requirement if the QuantumX modules are
a long distance away from one another and an
IEEE1394b FireWire connection would be too complex.
Synchronization with external sources
In an external synchronization source is set, the module
with the best synchronization quality automatically
becomes the master and synchronizes all modules con
nected via IEEE1394b FireWire.
If several external sources are selected, the system
decides according to the following priorities:
1. EtherCAT®
2. IRIG-B
3. NTP
Synchronization via EtherCAT®
The CX27 gateway supports the “Distributed Clocks”
expansion of EtherCAT®. The time is distributed to all
EtherCAT® nodes in an EtherCAT® group.
The CX27 module can be synchronized to the Ether
CAT® time. This will mean that all the QuantumX module
clocks are synchronized to this time.
Synchronization via an NTP server
Each QuantumX module can synchronize its internal
clock with an NTP server. The NTP time is distributed to
the other modules via IEEE1394b FireWire.