Interference From Equipment; Wire Break Detection; Process Data; Selection Of Process Data - Beckhoff ELX3312 Operating Manual

Two and four channel analog input terminals for thermocouples, 16 bit, ex i

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Parameterization and programming

5.5

Interference from equipment

When operating the ELX331x analog EtherCAT terminals, high frequency superimposed signals from

interfering devices (e.g. proportional valves, stepper motors or DC motor output stages) can be picked up by

the terminal. In order to guarantee interference-free operation, we recommend the use of separate power

supply units for the terminals and the interference-causing devices.

5.6

The ELX331x terminals provide a wire break detection of the connected thermocouple. A periodical testing

current of up to 1 mA will be given to the thermocouple for detection. No voltage measurement takes place

during test.

Due to particular cases, the testing current could have a disturbing effect, the wire break detection can be

disabled by CoE object 0x80n0:0E [} 74] (Disable wire break detection).

5.7

This section describes the individual PDOs and their content. A PDO (Process Data Object) is a unit on

cyclically transmitted process values. Such a unit can be an individual variable (e.g. the temperature as a 16-

bit value) or a group/structure of variables. The individual PDOs can be activated or deactivated separately

in the TwinCAT System Manager. The 'Process data' tab is used for this (visible only if the terminal is

selected on the left). A change in the composition of the process data in the TwinCAT System Manager

becomes effective only after restarting the EtherCAT system.

5.7.1

The process data of the ELX3312 are set up in the TwinCAT System Manager. The PDOs can be activated

or deactivated separately. The 'Process data' tab is used for this (visible only if the terminal is selected on

the left).

Version: 1.3.0

ELX3312 and ELX3314

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Elx3314