Design andVerification of Safety Circuits Per Iso 13849- 1: Obliczenia etapowe

Bezpieczne obwody are esential in machinery to prevent empients andd ensure operator protection. The ISO 13849- 1 standard provides es guidelines for designing andd verifying these safety functions through gh systematic calculations. Thie article outlines the step process for designing andd verifying safety objects according to ISO 13849-1.

Uzgodnienie ISO 13849- 1

ISO 13849- 1 specifies the safety performance levels for control systems. It presizes risk assesment, safety function design, ande verification. The standard categorizes safety functions into performance levels (PL), ranging from PL a (lowett) to PL e (highest). Achieving the appropriate PL depends on the risk sequity andhe safectionion 's relabilioy.

Krok 1: Ocena ryzyka i bezpieczeństwo

Procesy te zaczynają się od wiedzy o potencjale zagrożenia i oceniają ich szczebel. Based on this, safety requirements are e defined, including thee necessary performance Level (PL). This step determinates thee target reliability for thee safety object.

Step 2: Safety Function Design

Te safety function is designad to reduce risk to an acceptable level. It involves selecting appropriate sensors, logic units, ande actuators. Thee designan mustt ensure thee safety function can reliable decident faults andd initiate safe shutdown or stops.

Step 3: Calculating thee Diagnostic Coverage (DC)

Diagnostyka coverage measures thee ability of thee safety system to decintet faults. It is expressed as a difficage and influences thee Safety Integraty Level (SIL) or performance Level (PL). Hiper DC improwizuje te te safety functionity.

Step 4: Determining the eterure Rates

Te rates are e used te caculate thee probability of dangerous failures. The goal is te failure fabule probability aligns with the target PL.

Step 5: Calculating the Overall Reliability

Te wszystkie zasady dotyczą tego, że istnieje prawdopodobieństwo, że te niepowodzenia będą miały wpływ na sytuację, w której te wymagania są uzasadnione.

Step 6: Verification andd Validation

Te final step involves verifying the safety obrączs meets thee calculated reliability targets. Testing, fault injection, and documentation are use to to validate thee safety functioon 's performance. Regular confidence and periodyc testing are recommended to maintain safety levels.