8536IB1904EN-04

Architectural Requirements for Wiring Category 4

Designated architecture for Category 4 is defined in EN ISO 13849–1, 6.2.7.

Designated architecture for Category 4 (EN ISO 13849–1)

im: interconnecting means

L1, L2: logic

c: cross monitoring

m: monitoring

I1, I2: input device, e.g. sensor

O1, O2 : output device, e.g. main contactor

Solid lines for monitoring represent diagnostic coverage that is higher than in the designated architecture for category 3.

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