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Description

The CLT3-4 is a quadruple input digital termination device designed for 24 V dc automation applications. It provides the front-end circuitry of a digital input module (I/O) in industrial automation, and drives an isolating opto-coupler.

Features

■ 4 channel topology

■ Wide range input dc Voltage:

– VI= - 0.3 to 30 V with RI = 0

– VI = - 30 to 30 V with RI = 1.8 kΩ

– Low side configuration with common ground

■ Current limiter:

– IGEN = 3 mA

– Input current limiter activation voltage < 5 V

– Temperature compensated operation

■ Opto-coupler drive:

– No coupler activation below 1.5 mA input current

■ Input protection (RI = 1.2 kΩ):

– IEC 61000-4-2 electrostatic discharge ESD, Class 3

In contact, ± 6 kV; in air, ± 8 kV

Level B: temporary disruption; no change of opto-coupler state

– IEC 61000-4-5 voltage surge, Class 3

± 1000 V with 42 Ω serial resistor in differential mode

Level B: temporary disruption

– IEC 61000-4-4 transient burst immunity

± 4 kV peak voltage; 5 kHz repetitive rate

Level A: fully functional

■ Operating ambient temperature: - 25 to 85° C

Benefits

■ Reduced overall dissipation

■ Compact with high integration

■ Enables input to meet type 1 and 3 characteristic of IEC 61131-2 standard

■ Compatible operation with 2 and 3 wires proximity sensor according EN60947-5-2 standard

■ Insensitive to the on state sensor impedance

■ Surface mount package for highly automated assembly

■ Enhanced functional reliability

Applications

■ Industrial automation

■ Programmable logic controller

■ Communication field bus nodes

■ Peripheral input / output modules

■ Machine tool interface