Beckhoff KS4494 Bus Terminal Analog Input/Output Module

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Fabricante: BECKHOFF
Nº do Produto: KS4494
País de origem:Alemanha
Tipo de Produto: Analog I/O Modules
Pagamento: T/T, Western Union
Peso: 55g
Dimensões: 12 mm x 100 mm x 68 mm
Porto de embarque: Xiamen
Garantia: 12 meses

Description

Interfacing field instruments with standard PLC process control systems requires reliable, noise-resistant signal conversion. The Beckhoff KS4494 Bus Terminal integrates physical analog measurement and signal output capabilities into a single, space-saving 12 mm housing module. Operating directly on the standard K-bus backplane, this module provides dual-channel analog inputs and dual-channel analog outputs configured for bipolar -10 to +10 V single-ended signaling. Its distinct pluggable wiring interface enables rapid, error-free wiring field assembly and hot-swappable terminal block replacements without disturbing permanent control cabinet wiring connections.

Key Technical Features

Dual-Function Assembly: Houses 2 analog inputs and 2 analog outputs within a unified physical terminal channel structure.
Bipolar Voltage Range: Configured for high-precision -10 to +10 V signal ranges, optimizing control for actuators and bi-directional sensors.
Pluggable Wiring Level: Tool-less terminal block detachment design simplifies on-site hardware maintenance cycles.
Electrical Isolation: Features 500 V galvanic isolation between the internal K-bus and the field-side analog circuits.
Efficient Power Sourcing: Low typical current consumption of 70 mA directly from the K-bus internal logical supply line.

Industrial Applications

Proportional Valve Control: Standard interfacing for industrial hydraulics and pneumatic positioners requiring bipolar signal drives.
Closed-Loop Speed Control: Synchronizing feedback from variable frequency drives (VFDs) and positioning tachometers.
OEM Machine Integration: Compact multi-channel signal routing inside standard manufacturing cells with restricted installation footprint.
HVAC Damper Actuation: Controlling electronic draft dampers and air handler systems using standard voltage loops.

Technical Specifications Table

Parameter Name	Value Specification
Manufacturer	Beckhoff Automation GmbH & Co. KG
Model Designation	KS4494
Terminal Style	Pluggable connection level (KS Series)
Input / Output Count	2 Analog Inputs / 2 Analog Outputs
Analog Signal Type	Single-ended, -10 to +10 V
Resolution	12-bit binary
Conversion Time	< 2 ms
Output Error Margin	< +/-0.3% (relative to full scale)
Internal Input Resistance	> 130 kOhm
Output Load Limit	> 5 kOhm (short-circuit proof)
Current Draw (K-Bus)	typ. 70 mA
Isolation Voltage	500 V (K-bus to signal potential)
Conductor Connection Type	Spring-actuated cage clamps
Wire Cross-Section	Solid/Stranded: 0.08...1.5 mm2 (AWG 28...16)
Housing Material	Polycarbonate, flame-retardant
Operating Temperature	0 to +55 degC
Dimensions (W x H x D)	12 mm x 100 mm x 68 mm
Net Module Weight	0.055 kg
Shipping Weight (Calculated)	2.00 kg (with reinforced industrial protective packaging)
Country of Origin	Germany

Connections and Interfaces

Terminal Contact Point	Signal Assignment	Functional Circuit Details
Contact 1	Input 1 (+)	Analog input channel 1 signal line (-10 to +10 V)
Contact 2	Output 1 (+)	Analog output channel 1 control line (-10 to +10 V)
Contact 3	0 V (Input 1 Ref)	Common reference return path for Input 1
Contact 4	0 V (Output 1 Ref)	Common reference return path for Output 1
Contact 5	Input 2 (+)	Analog input channel 2 signal line (-10 to +10 V)
Contact 6	Output 2 (+)	Analog output channel 2 control line (-10 to +10 V)
Contact 7	0 V (Input 2 Ref)	Common reference return path for Input 2
Contact 8	0 V (Output 2 Ref)	Common reference return path for Output 2

Empirical Engineering Insights

Alternative Models & Compatibility

The KS4494 serves as the direct physical drop-in equivalent to the standard Beckhoff KL4494 bus terminal block. While the KL4494 utilizes static cage clamps, the KS4494 integrates a split, multi-pin pluggable front interface. Both terminals share the exact same TwinCAT XML device description (GSDML/EDS configurations) and use identical 2 x 16-bit input and 2 x 16-bit output process images, requiring zero modifications to controller logic during hardware modernization programs.

Application Pitfalls & Engineering Notes

Because this module utilizes a single-ended signal configuration with internal reference ground links, field instrumentation sharing common paths can introduce signal skewing. When routing cables across long industrial enclosures, ground loops might compromise the 12-bit ADC digitization stability. Ensure external transmitters and current loads share a zero-volt potential close to the terminal group or deploy isolation barriers if signal noise spikes are detected in TwinCAT Scope.

Commissioning & Wiring Tips

Use a standard 3.0 mm flat-head terminal screwdriver to actuate the spring contacts. We highly recommend using shielded twisted pair (STP) cabling for all -10 to +10 V connections, grounding the shield exclusively at the cabinet side's main grounding busbar. During initial startup, map variables within TwinCAT to monitor the raw register values, where standard hexadecimal limits represent the bipolar physical boundaries.

Installation Guidelines

CRITICAL SYSTEM INTEGRITY WARNING

Always isolate all field-side and logic-side power supplies before mounting, dismounting, or inserting/extracting the pluggable terminal blocks. Failure to de-energize the K-bus backplane can lead to physical arc damage or disrupt adjacent backplane communications, triggering a bus controller watchdog shutdown.

Align the slide-and-key guide mechanism on the side panel of the KS4494 with the adjacent bus terminal of your installation layout.

Press down firmly on the DIN rail carrier until the lock clip securely engages with the 35 mm mounting rail (conforming to EN 60715).

Insert the pre-wired pluggable wiring block into the front socket interface of the module until it clicks securely into place.

Key Features:

#Analog I/O Modules #Beckhoff Bus Terminals

What is the key functional difference between the Beckhoff KL4494 and the KS4494?

The primary difference lies in the wiring interface. The KL4494 features standard fixed tension clamp connections, while the KS4494 integrates a pluggable terminal design that allows the active module body to be swapped without disconnecting the field-level wiring.

How do the single-ended analog input connections on the KS4494 function?

The module utilizes a common internal 0 V potential reference across the input and output channels. Unbalanced signals with potential reference differences between connected field devices should be avoided to prevent noise and grounding loops.

Can the inputs and outputs handle typical 0 to 10 V voltage ranges?

Yes, although the module is engineered for a full bipolar -10 V to +10 V signal range, it is backwards compatible and can process standard unipolar 0 to +10 V ranges through software calibration in TwinCAT.

Is the analog output circuitry protected against external short-circuits?

Yes, the analog outputs are designed to be short-circuit proof with a load resistance requirement of greater than 5 kOhms to prevent damage from faulty wiring configurations.

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TECHNICAL SPECIFICATIONS

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Beckhoff KS4494 Bus Terminal Analog Input/Output Module