Category: Beckhoff

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.

Special features:

• 2 PWM outputs with push-pull output stage

• suitable for inductive loads > 1 mH

• max. output current ±2 A per channel at 24 V DC nominal voltage

The EL2522 incremental encoder simulation terminal (pulse train)

outputs a frequency-modulable signal on two channels with four

outputs. The signal can be used to control motor drivers or other

signal receivers, which are controlled by single cycles.

The pulse sequence and pulse number can be specified directly

via the process data in the frequency. Alternatively, the integrated

path control can be used. For each channel the operating mode

(frequency modulation, pulse/direction specification and incremental

encoder simulation) can be selected. In addition, the EtherCAT

Terminal can control three output channels in the ABC encoder

simulation.

Special features:

• Pulse train (frequency output), RS422

• Different operating modes

• Frequency modulation

• Pulse direction setting

• Incremental encoder simulation (1x ABC, 2x AB)

• Integrated path control

• Synchronized operation through distributed clocks XFC technology possible

The EL2521-xxxx output terminals change the frequency of a binary signal

and output it (electrically isolated from the E-bus). The frequency is preset

by a 16 bit value from the automation device.

The signal state of the EtherCAT Terminal is indicated by light emitting

diodes. The LEDs are clocked with the outputs and each displays an active

output.

Special features:

• Pulse train (frequency output)

• Different operating modes

• Frequency modulation

• Pulse direction setting

• Incremental encoder simulation (2x AB)

• Integrated path control

• Synchronized operation through distributed clocks XFC technology possible

• Different output specifications possible

• 24 V DC version, externally powered, with capture/compare input/output

The EL2521-xxxx output terminals change the frequency of a binary signal

and output it (electrically isolated from the E-bus). The frequency is preset

by a 16 bit value from the automation device. The signal state of the

EtherCAT Terminal is indicated by lightemitting diodes.

The LEDs are clocked with the outputs and each displays an active output.

Special features:

• Pulse train (frequency output)

• Different operating modes

• Frequency modulation

• Pulse direction setting

• Incremental encoder simulation (2x AB)

• Integrated path control

• Synchronized operation through distributed clocks XFC technology possible

• Different output specifications possible

• 24 V DC version, externally powered, ground-switching

The EL2521-xxxx output terminals change the frequency of a binary

signal and output it (electrically isolated from the E-bus).

The frequency is preset by a 16 bit value from the automation device.

The signal state of the EtherCAT Terminal is indicated by light emitting

diodes.The LEDs are clocked with the outputs and each displays an

active output.

Special features:

• Pulse train (frequency output)

• Different operating modes

• Frequency modulation

• Pulse direction setting

• Incremental encoder simulation (2x AB)

• Integrated path control

• Synchronized operation through distributed clocks XFC technology possible

• Output specification: 24 V DC, externally powered

The EL2521-xxxx output terminals change the frequency of a binary signal

and output it (electrically isolated from the E-bus). The frequency is preset

by a 16 bit value from the automation device. The signal state of the

EtherCAT Terminal is indicated by light emitting diodes.

The LEDs are clocked with the outputs and each displays an active output.

Special features:

• Pulse train (frequency output)

• Different operating modes

• Frequency modulation

• Pulse direction setting

• Incremental encoder simulation (2x AB)

• Integrated path control

• Synchronized operation through distributed clocks XFC technology possible

• Different output specifications possible

• RS422 version, 5 V DC level

The EL2502-0010 output terminal modulates the pulse width of a binary

signal, and outputs it electrically isolated from the E-bus.

The mark/space ratio is preset by a 16-bit value from the automation device.

The output stage is protected against overload and

short-circuit. The EtherCAT Terminal contains two channels whose signal

state is indicated by LEDs. The LEDs are driven in time with

the outputs, and show the duty factor by their brightness.

The EL2502-0010 supports EtherCAT distributed clock timestamps in

order to influence switching on, off and over of a PWM signal with

microsecond precision.

Special features:

• PWM output with push-pull output stage

• max. output current 0.5 A per channel

• separate frequency adjustable for each channel

• synchronized operation through distributed clocks XFC technology possible

• support of XFC technology timestamp

The ED2504 EtherCAT Terminal offers up to four digital outputs,

which are output as pulse-width modulated signals. The output

signal can be modulated in both pulse width and frequency in

the range of 1 Hz to 64 kHz. The output level is determined by

the external voltage to be fed in and can be freely selected in

the range from 5 V DC to 24 V DC.

The outputs are short circuit and overcurrent protected.

Each channel also has a digital input with configurable filter times.

The switching characteristic can be selected as either positive

or ground switching (PNP/NPN) for each channel.

The input can be used as a digital input or to enable the PWM

output. If the PWM signal is used to control the fan, for example,

the additional input can be used for the measurement of rotary

speed.

The ED series EtherCAT Terminals have push-in connection

technology which makes wiring easy and tool-free.

The EL2262 digital output terminal connects the binary control output

signals at the process level with electrical isolation. The outputs are

controlled with an adjustable integral multiple (oversampling factor: n)

of the bus cycle frequency (n microcycles per bus cycle).

For each bus cycle, the EtherCAT Terminal receives a process data block

that is output consecutively. The timebase of the terminal can be

synchronized precisely with other EtherCAT devices via distributed

clocks. An output pattern with a significantly higher pulse sequence

than the bus cycle time is thus output precisely with the system-wide

timebase. This procedure enables the temporal resolution of the digital

output signals to be increased to n times the bus cycle time.

The maximum output rate is 1 Msamples/s.

Special features:

• push-pull output

•connection of different load types possible (ohmic, inductive, lamp load)

•synchronized operation through distributed clocks XFC technology possible

•multiple sampling of a process data through oversampling

The 8-channel digital output terminal EL2258 connects the binary output

signals of the controller at the process level with electrical isolation.

As in the EL2252. the outputs of the EL2258 are switched with high

precision relative to the transferred time stamp, although there are certain

differences in the details: Eight instead of two channels, lower timestamp

resolution and auto activation, which enables consecutive switching tasks

in each cycle. The multi-timestamping feature allows each EtherCAT cycle

to capture or output as many events per channel as were preloaded in

the internal buffer.

The distributed clocks are used as time reference. In conjunction with

timestamp input terminals the EL2258 enables responses at equidistant

time intervals that are largely independent of the bus cycle time.

Special features:

• Connection of different load types possible (ohmic, inductive, lamp load)

• Synchronized operation through distributed clocks XFC technology possible

• High performance thanks to XFC multi-timestamp function and auto-activation