Architectural Requirements for Wiring Category 2
Designated architecture for Category 2 is defined in EN ISO 13849-1, 6.2.5.
Designated Architecture for Category 2 (EN ISO 13849-1)
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I: input device |
m: monitoring |
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L: logic |
TE: test equipment |
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O: output device |
OTE: output of TE |
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im: interconnecting means |
SRP/CS, the safety-related part of the control system, of Wiring Category 2 must be designed so that their function(s) are checked at suitable intervals by the machine control system.
In single-channel architecture, a SIM is associated with a SIL* starter.
Specifically, for Wiring Category 2, the mirror contact is connected to the Preventa™ XPS module (or equivalent). If the state of the mirror contact feedback line does not equal the Preventa XPS module (or equivalent) output state, the Preventa XPS module (or equivalent) blocks a second start.