Module synchronization

If measurement signals need to be referenced over time with each other for processing and analysis, they must be recorded synchronously.

All SomatXR modules can be synchronized among themselves. This ensures simultaneous measurement on all channels. All the analog‑digital converter rates, measuring rates and bridge excitation voltages are also synchronized.

To achieve a precise reference over time, the applicable channels must be parameterized with the same filter settings. No automatic runtime correction is carried out. The filter runtimes are shown in the data sheet. After booting and successful synchronization, the system LED shows green. If synchronization is disturbed, or not yet established, the system LED shows orange.

Time stamps are appended to the measured values in the following format:

  • Basis: 1.1.2000
  • Time stamp: 64 bit
  • 32 bit seconds
  • 32 bit fractions of a second

Synchronization Method Overview

Feature FireWire Ethernet PTPv2 Ethernet NTP EtherCAT®
Synchronization with other devices QuantumX QuantumX (B and C series)
MGCplus (CP52)
eDAQXR
eDAQXR-lite
Quantum X
MGCplus
other
all EtherCAT® participants
Maximum distance between modules 5 m
(40 m with FireWire extender,
500 m via optical fiber)
100 m 100 m 100 m
Number of modules 24 Unlimited Unlimited Unlimited (CX27C-R needed)
Accuracy < 1 µs < 1 µs < 10 ms < 1 µs
Settling time Immediate Immediate approx. 2 hrs during start
approx. 10 min during restart
Immediate
Master MX module External PTP grand master
MX Module
CX23-R
EXR-CPU
EXRL-CPU
External SyncMaster External SyncMaster
Voltage supply 1.5 A looped through None None None