Beckhoff EL33-00 Series, Documentation

Page: 26 / 204

Product overview
EL33xx-00x0 26 Version: 4.2
2.4 EL3314-0090
2.4.1 Introduction
Fig. 17: EL3314-0090
4-channel thermocouple input terminal with open-circuit recognition, TwinSAFE Single Channel
The EL3314-0090 analog input terminal allows four thermocouples to be connected directly. The EtherCAT
Terminal circuit can operate thermocouple sensors using the 2-wire technique. A microprocessor handles
linearisation across the whole temperature range, which is freely selectable. Compensation for the cold
junction is made through an internal temperature measurement at the terminal. The EL3314-0090 can also
be used for mV measurement.
With the aid of the TwinSAFE SC technology [ } 141] (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 Bus Terminals, 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
Quick links
• EtherCAT basics
• Technology EL33xx [ } 30]
• Status word [
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166]
• Process data and operation modes [
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