AN2846 datasheet(29/35 Pages) STMICROELECTRONICS

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AN2846

Electromagnetic compatibility (EMC) requirements

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Electromagnetic compatibility (EMC) requirements

The SCLT3-8 has been designed to withstand electromagnetic interference as specified in

the IEC 61131-2 standard. This international standard gives all the requirements and

conditions for tests that must be performed on the programmable logic controllers (PLC) and

their associated peripherals. IEC 61000 4-2, 4-4, 4-5 and 4-6 standards define test

methods.

The current limited inputs and supply pins of SCLT3-8 are protected against high voltage

disturbances by a clamping circuits that are grounded to the common pin COMP. Combined

with serial input resistances RIN or RC (see Figure 38). These clamping circuits are effective

against ESD (±8 kV contact), fast transient burt (±2.5 kV), and voltage surge (±1 kV).

Figure 38.

Protection clamping circuits

6.1

IEC 61000 4-2

This standard specifies the behavior of the device when subjected to electrostatic

discharges. The discharges must be applied to operator accessible parts. This means that

these tests have to be performed on each connector pin. The required levels are: air

discharge: ±15 kV, contact discharge: ±8 kV.

The system must continue to operate as intended after the discharge. Temporary

degradation of the performance is acceptable during the test, but the system must recover

by itself after the test (B criterion).

All SCLT3-8 pins are ESD protected.

COM

39V

Supply

circuit

COMP COMS

Input

circuit

IN1

39V

IN2

39V

IN3

39V

IN4

39V

IN5

39V

IN6

39V

IN7

39V

IN8

39V

RIN

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