Beckhoff EP3356-0022 Documentation page 74

Commissioning/Configuration
Legend
Name Designation
U Bridge voltage/differential voltage of the sensor element, after averager
Diff
and filter
U Bridge supply voltage/reference signal of the sensor element, after
ref
averager and filter
A Internal gain, not changeable. This factor accounts fort he unit
i
standardisation from mV to V and the different full-scale deflections of the
input channels
C Nominal characteristic value of the sensor element (unit mV/V, e.g.
n
nominally 2 mV/V or 2.0234 mV/V according to calibration protocol)
C Zero balance of the sensor element (unit mV/V, e.g. -0.0142 according to
ZB
calibration protocol)
E Nominal load of the sensor element
max
A Scaling factor (e.g. factor 1000 for rescaling from kg to g)
S
G Acceleration of gravity in m/s^2 (default: 9.80665 ms/s^2)
Gain
Tare
Conversion mode
The so–called conversion mode determines the speed and latency of the analog measurement in the EL/
EP3356. The characteristics:
Mode Meaning
0 High precision
Analog conversion at 10.5 kSps
(samples per second) Slow conversion
and thus high accuracy
1 High speed / low latency Analog
conversion at 105.5 kSps (samples per
second) Fast conversion with low latency
Due to the conversion principle of the EL/EP3356, the analog voltage is only available as a digital value after
a defined time. This is shown in figure below.
A step signal 0->1 is applied to the input. The measured value is reached and readable within the defined
accuracy after 7.2 ms or 0.72 ms, depending on the conversion mode 0/1. At this time the timestamp is also
acquired in Distributed Clocks mode. In real operation a step signal is not normally connected, but rather a
higher frequency but constant signal. The EL3356 then maps the input signal with the corresponding latency
for further processing, for which reason faster querying of the sampling unit at shorter intervals than the
latency (EL3356-0010 allows up to 100 µs) makes sense for true-to-detail mapping of the analog input
signal.
74
typ. la- EL3356 EL3356-0010
tency and
EP3356-0022
7,2 ms x x
0,72 ms - x
Version: 1.1.0
CoE Index
8000:23 [} 104]
8000:25 [} 104]
8000:24 [} 104]
8000:27 [} 104]
8000:26 [} 104]
8000:21 [} 104]
8000:22 [} 104]
typ. current
consumption
70 %
(see Technical
data [} 9] re-
garding nomi-
nal value)
100 %
(see Technical
data [} 9] re-
garding nomi-
nal value)
EP3356-0022