Pepperl+Fuchs VAR-KE3-TERM AS-Interface Repeater

Technical Overview

Advanced AS-Interface repeater with switchable terminator. Extends network length, provides galvanic isolation, and requires no configuration.

Key Features

Minimum delay of signal.
Line lengthening by 100 m (max. 2 repeaters in series).
Galvanic isolation between AS-Interface segments A and B.
No parameterization required.
Does not require a specific address on the AS-Interface bus.
Housing with removable terminals.
Integrated terminator permits up to 200 m network lengths on Segment A.
Two LEDs indicate the correct polarity of AS-Interface cables.
Two LEDs indicate communication errors in AS-Interface circuits.
Switchable bus termination.
Optimized alignment between sender and receiver for shorter delay.
Mounting on 35 mm DIN mounting rail.

Technical Specification Matrix

Parameter	Value
AS-Interface Specification	V3.0
Required Master Specification	≥ V2.0
Rated Operating Voltage	26.5 ... 31.6 V from AS-Interface
Rated Operating Current	60 mA (per strand element), 120 mA (total)
Insulation Voltage	≥ 500 V
Ambient Temperature	0 ... 55 °C (32 ... 131 °F)
Degree of Protection	IP20 according to EN 60529
Mounting	35 mm DIN mounting rail
MTTFd	155 years
UL File Number	E223772
Physical Weight (kg)	0.2
Dimensions L x W x H (cm)	0 x 2.25 x 0

Industrial Applications

1. Extended Machine Line Communication

In large-scale manufacturing facilities where AS-Interface networks exceed standard cable length limitations, this repeater can extend the network by 100m (or up to 600m with multiple repeaters and termination). This is crucial for connecting sensors and actuators across long production lines without compromising signal integrity or requiring new AS-Interface masters.

Problem Solved

Overcoming AS-Interface cable length restrictions to maintain robust communication in expansive industrial environments.

AS-InterfaceNetwork ExtensionLong Distance CommunicationIndustrial AutomationSignal Integrity

2. Electrical Noise Isolation in Harsh Environments

For industrial applications where electrical noise or ground loops could disrupt AS-Interface communication, the galvanic isolation between AS-Interface segments A and B provided by this device is vital. This ensures reliable data transmission in electrically noisy environments common in heavy industry.

Problem Solved

Protecting sensitive AS-Interface communications from electrical interference and ensuring system stability in harsh industrial settings.

Galvanic IsolationElectrical Noise ImmunityGround Loop PreventionEMI/RFI ProtectionRobust Communication

3. Modular AS-Interface Network Design

The VAR-KE3-TERM facilitates modular network design by allowing logical separation of AS-Interface segments. Its lack of requiring specific parameterization or an individual AS-Interface address simplifies network commissioning and maintenance, enabling flexible expansion or modification of AS-Interface systems.

Problem Solved

Simplifying the design, expansion, and maintenance of complex AS-Interface networks by providing modularity and plug-and-play functionality.

Modular AutomationNetwork SegmentationPlug-and-PlaySimplified CommissioningAS-Interface Network Design