CLT devices form a new series of intelligent protected terminations designed for digital-input modules and proximity-sensor interfaces in industrial and building automation systems.
Today’s designers face the challenge of increasing the number of I/Os per volume unit and increasing the I/O-interface features. The CLT series offers compact, highly-immune solutions which resist transient disturbances such as those described in the IEC 61000-4 standard. As a result, the CLT series cuts losses of the digital input by more than 2.
The SCLT3-8B, a serialized 8-input termination circuit, is a new addition to the CLT3-4B and PCLT-2A range.
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The CLT3-4B is a quad termination circuit that runs as type 1 or 3, with its current limited to 2.7 mA typical, and transfers its logic state to an opto-transistor.
The PCLT-2A is a dual termination circuit able to run as type 2 or 3 by its programmable current limiting from 2.5 mA to 7.5 mA. Its output is CMOS compatible.
The SCLT3-8B device further enhances system integration by cutting dissipation (1 W saved per SCLT) and reducing the count of opto-transistors on board. For its eight type 3 input sections, the SCLT3-8B embeds an adjustable digital filter and a LED status driver per input. It also serializes the input-state transfer using a 2 MHz SPI peripheral and a 5 V voltage regulator that supplies the three SPI transferring isolators.
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| Features and benefits |
| Features |
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Multi-channel IEC 61131-2 type 1, 2, 3 inputs |
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EN60947-5-2 sensor interface |
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Active current-limiting input |
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Front-end on-chip LED visual status driver |
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Settable input digital-noise filter, SCLT3-8 |
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Several output configurations:
- Opto-coupler drive: CLT3-4 and PCLT-2
- CMOS compatible: PCLT-2
- 2 MHz SPI serial interface: SCLT3-8 |
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Wide input voltage range: -30 to +35 V |
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Wide temperature range: -25 to +85 °C |
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| Benefits |
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At least 65% dissipation reduction |
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50% fewer components on I/O board |
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Fully EMC compliant:
- Surge: IEC 61000-4-5, 1 kV
- ESD: IEC 61000-4-2, 15 kV
- EFT burst: IEC 61000-4-4, 4 kV |
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Robust to reverse-polarity connection |
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Compact and surface-mount devices |
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| Current-limiting termination |
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