QUANTUM X CX27, Руководство по эксплуатации

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HBM QuantumX
5.5 Synchronization
It is important for the timing of all the nodes in the network to be exactly synchronized when
simultaneous actions are required for widely distributed processes. With the distributed
clocks synchronization method (IEEE 1588), the timing of the master clock is transmitted to
the slave clocks via the EtherCAT network and aligned to compensate for the delay offset.
With an EtherCAT grouping, the principal clock is in a slave device, as the master should
deliberately be mapped by standard components. All the nodes can then be synchronized
with an error of less than 1
m
s.
The distributed clocks option can be activated/deactivated by a relevant tag in the Device
Description File (DDF). If distributed clocks is activated, the timing master forwards the time
to the QuantumX slave and this distributes the timing to the modules. The default is for
distributed clocks to be activated.
The distributed clocks approach is also useful when you want to perform measurements in
parallel via Ethernet and enlist the same time stamp as a reference.
If the master does not support distributed clocks, the time is set to zero on module startup
and timing commences from this point.
The EtherCAT CX27 slave connects the powerful, modular QuantumX data acquisition
system to this fieldbus with up to 199 time-synchronized signals. The maximum sampling
rate at this time is 1200 Hz.
Up to 3 Sync Managers can be assigned.
The CX27 operates with the ”SYNC 0” pulse. The cycle time can be set up to the 125
µ s
range. Smaller values cause the loss of real-time data.