Beckhoff EL3074 | EtherCAT Terminal, 4-channel analog input

The EL3072. EL3074. and EL3078 analog input terminals are universal

10 V/20 mA input modules in the 16-bit class for simple control tasks.

Input signals in the -10/0...+10 V or -20/0/+4...+20 mA ranges can

be processed per channel. Voltage and current signals are connected

to different terminal points. CoE can be used to set each channel to U

or I mode in TwinCAT or from the controller.

The voltage and current inputs are single-ended. This means that one

connection point of each channel is connected to +24 V or 0 V

(power contacts) in the terminal. All inputs are digitized with a 16-bit

resolution and transmitted to the superordinate automation system

under electrical isolation. With a technical measuring range of ±107%

of the nominal range, the terminal also supports commissioning with

sensor values in the limit range and evaluation in accordance with

NAMUR NE43.

The EL3072 has two individually parameterizable inputs and supports

2-, 3-, and 4-wire connection. It can supply sensors with +24 V directly.

With the EL/ELM264x (Reed) and ELM274x (Solid-State) Beckhoff

is considerably extending the usage possibilities of the integrated

measurement technology of the ELM3xxx series as well as the

normal EL3xxx/EL4xxx analog inputs and outputs, because several

sensors or sources can now be connected at the same time to one

analog input channel.

To this end, the ELM2642 and ELM2644 are equipped with Reed

relays as switching elements, allowing fast switching cycles and a

long lifetime. The electrical isolation and the constant contact

resistance of the reed switch allows the measurement of even

sensitive signals up to fast scanning operation.

Due to the double input connectors X the channels can easily be

connected to 1 x 8 multiplexers and more.

The multi-channel recording of analog signals as well as the flexible

switching of various test states in production-integrated test stations

is easily possible through the integration of the often necessary

switches into the EtherCAT system.

The EL2904 has safety parameters to specifically adapt the

functionality to the respective safety requirements.

For example, a current measurement at the outputs and a test of

the outputs can be configured in order to be able to detect cross

-circuits among other things and to react appropriately.

In addition, standard outputs can be activated for the EL2904.

As a result, corresponding standard outputs are available in the

process image in parallel and internally ANDed with the safe

outputs of the EL2904. The safe output signals, which are controlled

by a TwinSAFE Logic, thus issue the safe release for the standard

signals, which can be triggered by the non-safety oriented control

system independently of the cycle of the safety controller and FSoE.

This allows faster switching times of the outputs, provided that

the safety controller issues the necessary release for the output.

The safety parameters are not stored directly on the component,

but are transmitted to the component via a TwinSAFE Logic capable

component when the safety application is started.