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KL2521
Beckhoff KL2521 available at EU Automation. Get in touch today for a quick price.
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What happens next?
1. Email confirmation
You will get an email confirming that we have received your enquiry.
2. Dedicated Account Manager
One of our team will be in touch to confirm your part(s) specification and condition.
3. Your quote
You will receive a comprehensive quote tailored to your specific needs.
The Beckhoff KL2521 is a single-channel pulse train output Bus Terminal designed for precise control and positioning applications. It converts a binary setpoint into a variable-frequency output signal, electrically isolated from the K-bus, for connection to compatible stepper motors, servo drives and frequency converters.
Its RS422-compatible output stage supports frequency modulation, pulse-and-direction signalling and incremental encoder simulation using channels A and B. Integrated acceleration and braking ramps help provide smooth frequency changes while reducing the processing demands placed on the main controller. LED indicators display active output states, assisting with straightforward system monitoring and diagnostics.
Its RS422-compatible output stage supports frequency modulation, pulse-and-direction signalling and incremental encoder simulation using channels A and B. Integrated acceleration and braking ramps help provide smooth frequency changes while reducing the processing demands placed on the main controller. LED indicators display active output states, assisting with straightforward system monitoring and diagnostics.
| Specification | Description |
|---|---|
| Manufacturer | Beckhoff |
| Part Number | KL2521 |
| Product Type | Bus Terminal |
| Function | Single-channel pulse train output for generating variable-frequency binary signals |
| Number of Channels | 1 |
| Output Interface | RS422-compatible differential output |
| Output Signals | A and B pulse channels with complementary signal outputs |
| Maximum Output Frequency | 500 kHz |
| Frequency Resolution | 10 mHz |
| Frequency Setpoint | 16-bit value within the process image |
| Internal Frequency Resolution | 24-bit |
| Supported Pulse Patterns | Frequency modulation, pulse/direction and incremental encoder simulation |
| Direction Control | Direction can be represented by separate pulse channels, a direction signal or the phase relationship between A and B |
| Incremental Encoder Simulation | A and B signals with a 90° phase shift |
| Electrical Isolation | Output signal is electrically isolated from the K-bus |
| Integrated Ramp Function | Provides configurable acceleration and deceleration ramps with frequency changes calculated at 2 ms intervals |
| Inputs | 2 inputs, designated +T and +Z |
| Status Indication | LEDs indicate active signal states in synchronisation with the outputs |
| Typical Applications | Positioning control for stepper motors, servo drives, servo amplifiers and frequency converters |
| Commodity Code | 853890 |
What type of industrial component is this terminal?
The KL2521 is a single-channel pulse train output Bus Terminal designed to generate variable-frequency digital signals for drive control and positioning applications.
What applications is this output terminal commonly used for?
Typical applications include controlling stepper motors, servo drives and frequency converters, as well as carrying out straightforward positioning tasks and synchronising multiple drives.
Which pulse patterns can the terminal generate?
It can generate frequency modulation, pulse-and-direction signals and incremental encoder simulation. These patterns allow it to interface with several common drive input arrangements.
How does incremental encoder simulation work?
The A and B channels generate signals with a 90-degree phase offset. The phase sequence indicates the direction of movement, creating an output comparable to that of an incremental encoder.
How is direction represented in pulse-and-direction mode?
In this mode, channel A carries the pulse frequency while the logic level on channel B indicates the required direction of rotation.
What is the maximum output frequency?
The KL2521 can generate output frequencies of up to 500 kHz, making it suitable for drive systems that require rapid pulse commands.
What electrical interface does the output stage use?
The standard terminal uses an RS422-compatible output stage. This differential signalling method is well suited to reliable pulse transmission in industrial control installations.
Is the output electrically isolated from the terminal bus?
Yes. The generated pulse signal is electrically isolated from the K-bus, helping separate the field-side output from the terminal communication system.
Can the output signals be inverted?
Yes. The available pulse patterns can be inverted to accommodate different input circuit requirements.
What do the front LEDs indicate?
The LEDs display the active states of the terminal's output signals. They operate in step with the corresponding outputs, providing a clear visual indication during operation.
Can the terminal manage acceleration and deceleration ramps?
Yes. Ramp start frequency and run-up time parameters can be used so that the terminal performs smooth acceleration and braking transitions when the requested frequency changes.
What is the advantage of pulse train control over an analogue setpoint?
Pulse train control communicates the setpoint digitally, avoiding analogue offset drift while providing fine frequency resolution and precise positioning commands.
Can it be used to synchronise frequency converters?
Yes. Its incremental encoder simulation mode can provide a common reference signal for synchronising several frequency converters or related drive axes.
How many pulse output channels are provided?
The terminal is classed as a one-channel pulse train output device, with A and B signal paths used together to produce the selected pulse pattern and direction information.
What should be checked before installing this terminal?
Confirm the required signal standard, pulse pattern, maximum command frequency, terminal-bus compatibility, wiring arrangement and the input requirements of the connected drive.
- Generating pulse trains for stepper motor positioning
- Providing pulse and direction signals to servo drives
- Supplying variable-frequency setpoints to frequency converters
- Simulating incremental encoder signals for drive control
- Synchronising multiple frequency converters
- Controlling acceleration and deceleration ramps
- Replacing analogue ±10 V drive interfaces with digital signalling
- Supporting precise motion control in automated machinery
- Interfacing RS422-compatible positioning equipment
- Operating compatible equipment using externally supplied 24 V DC signals
This content has been produced using multiple sources. EU Automation takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
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Customer reviews
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