Beckhoff EL2784 | EtherCAT Terminal, 4-channel solid state relay output

Optimized control of proportional valves with PWM

The EL2535-xxxx output terminals are specially designed for the precise

control of single and double-coil proportional valves and proportional

solenoid valves. They regulate the output current through pulse width

modulation (PWM) of the supply voltage and are electrically isolated

from the E-bus. The current values (0 to maximum output current)

are specified by the automation device through a 16-bit value. 

The output stages are protected against overload and short circuit.

Each EtherCAT pulse width current terminal contains two channels

whose signal state is indicated by LEDs. The light emitting diodes

simplify local diagnosis by displaying typical load and wiring faults.

A practical test was able to show that an EL2622-0010 remained

fully functional at a capacitive continuous current load of 4 A after

200.000 switching cycles  (for details see documentation).

The signal state of the EtherCAT Terminal is indicated by light

emitting diodes.The EL2595 EtherCAT Terminal contains a

constant current source for LEDs and is designed to control one

or more LEDs connected in series.

The user specifies the required set current, the integrated power supply unit

then provides the required forward voltage, depending on the connected LEDs.

For this purpose, the EL2595 has a step-up/step-down power supply unit,

which generates the output voltage from the 24 V DC input voltage.

The output voltage is also adjusted during operation in order to maintain the

set current. The current can be switched quickly for short-term lighting,

hence even extremely short flashes of light are possible. The pulse duration

is adjustable from 1 µs to infinity, the flash time itself can be set through a

timestamp via distributed clocks; an external trigger input is also available.

Extensive real-time diagnostics, e.g. for input current/voltage and output

current/voltage allow detailed monitoring of the LED light intensity.

If a specifiable load corridor is exited, e.g., due to load errors, the EL2595

switches off to protect the load (resettable).

The EL2212 digital output terminal connects the binary control signals

from the automation device on to the actuators at the process level

with electrical isolation. The multi-timestamp features allow each

EtherCAT cycle to capture as many events per channel as were

preloaded in the internal buffer.