Beckhoff EtherCAT Terminals - EL3356-0090 | TwinSAFE SC: accurate 1-channel load cell analysis (resistor bridge), 24 bit
TwinSAFE SC: accurate 1-channel load cell analysis (resistor bridge), 24 bit EL3356-0090
Error Ref.
Self test
Measure
Power LED
Error Diff. 
Self calibration 
Steady state 
Run LED 
Power contact
+UV
Power contact 0 V
+UD
-UD
-Uv
Shield
+UREF
-UREF
+Uv
Shield
Top view 
Contact assembly 
The supply voltage UV has
to be supplied from an
external source, max. 12 V,
e.g. EL9510.

EL3356-0090 | TwinSAFE SC: accurate 1-channel load cell analysis (resistor bridge), 24 bit

The analog EL3356-0090 input terminal enables direct connection of a resistor bridge or load cell in a 4- or 6-wire connection technology. The ratio between the bridge voltage UD and the supply voltage UREF is determined simultaneously in the input circuit and the final load value is calculated as a process value on the basis of the settings in the terminal. With automatic self-calibration (can be deactivated) and dynamic filters the terminal with measuring cycles of 10 ms can be used for slow weighings with high precision.

With the aid of the TwinSAFE SC technology (TwinSAFE Single Channel) it is possible to make use of standard signals for safety tasks in any network or fieldbus. The standard functions and features of the I/Os remain available. The data from these TwinSAFE SC I/Os is fed to the TwinSAFE Logic, where they undergo safety-related multi-channel processing. In the Safety Logic the data originating from different sources is analysed, checked for plausibility and submitted to a “voting”. This is done by certified function blocks such as Scale, Compare/Voting (1oo2, 2oo3, 3oo5), Limit, etc. For safety reasons, however, at least one of the data sources must be a TwinSAFE SC component. The remainder of the data can originate from other standard I/Os, drive controllers or measuring transducers.

With the aid of the TwinSAFE SC technology it is typically possible to achieve a safety level equivalent to PL d/Cat. 3 in accordance with EN ISO 13849-1 or SIL 2 in accordance with EN 62061.

Technical data EL3356-0090
Number of inputs 2, for 1 resistor bridge in full bridge technology
Power supply via the E-bus
Technology resistor bridge, strain gauge
Distributed clocks yes
Measuring range UD max. -25…+25 mV rated voltage
Measuring range UREF max. -12…+12 V rated voltage
Internal resistance > 200 kΩ (UREF), > 1 MΩ (UD)
Input filter limit frequency 10 kHz low pass (-3 dB)
Conversion rate 10,000…4 samples/s (0.1…250 ms conversion time)
Power supply UV up to 12 V DC from power contacts, dependent on sensor
Resolution 24 bit, 32 bit presentation
Measuring error < ±0.01 % for the calculated load value in relation to the final load value with a 12 V feed and 24 mV bridge voltage (hence nominal strain gauge characteristic value of 2 mV/V), self-calibration active, 50 Hz filter active
Current consumption power contacts depends on strain gauge supply, min. 1 mA
Current consumption E-bus typ. 280 mA
Supported nominal sensitivity all, parameter resolution: 0.01 µV/V; recommended: 0.5…4 mV/V
Special features TwinSAFE SC, self-calibration, quadruple averager, dynamic filters
Weight approx. 60 g
Operating/storage temperature 0…+55 °C/-25…+85 °C
Relative humidity 95 %, no condensation
Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos. IP 20/variable
Pluggable wiring for all ESxxxx terminals
Approvals CE, UL, Ex, IECEx
Option for the second channel
EL3751 1-channel analog input, high-precision, parameterisable, 24 bit, 10 kSps, differential, oversampling
EL6224 EtherCAT Terminal, IO-Link master, IP 20
Related products  
EK1960 TwinSAFE Compact Controller
EL6910 TwinSAFE Logic (TwinCAT 3)
System  
TwinSAFE SC For further TwinSAFE SC products please see the system overview.