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Sicurezza Funzionale Svelata: Dal rischio alla funzione Safety: SRP/CS, stato sicuro, reset, attuatori finali e lettura professionale dello schema
Paperback
Series: S.E.I.S. - Professional Field Guides, Book 13
Publisher: Independently Published
Published: Aug 21 2026
Pages: 194
Weight: 0.59
Height: 0.41 Width: 6.00 Depth: 9.00
Language: Italian
Un dispositivo safety non rende automaticamente sicura una macchina.
Un pulsante di emergenza può funzionare correttamente mentre un altro rischio rimane scoperto.
Un safety relay può commutare e non portare comunque la macchina nello stato sicuro previsto.
Un drive può avere STO attivo mentre l'asse continua a muoversi per inerzia.
Il problema nasce quando si parte dal componente invece che dal rischio.
Sicurezza Funzionale Svelata è una guida operativa per imparare a ricostruire una funzione di sicurezza completa, dal motivo per cui esiste fino all'evidenza che ne dimostra il comportamento:
Rischio → Funzione safety → SRP/CS → Uscita sicura → Ripristino → Evidenza
Il metodo proprietario SICURA accompagna l'intero volume:
S - Scenario pericoloso
Identifica il pericolo, la situazione e il comportamento della macchina da controllare.
I - Identifica la funzione
Definisci in termini osservabili che cosa deve accadere quando la safety interviene.
C - Confine
Stabilisci dove iniziano e terminano le parti del sistema di comando relative alla sicurezza.
U - Uscita sicura
Segui la catena fino all'elemento che controlla realmente l'energia pericolosa.
R - Ripristino
Definisci reset, restart, nuovo Start e comportamento al ritorno dell'energia.
A - Attestazione
Collega schemi, software, manuali, configurazioni, prove e revisioni alla stessa funzione.
All'interno troverai:
- rischio, situazione pericolosa e stato sicuro;
- definizione delle funzioni safety;
- SRS e confine delle SRP/CS;
- catena ingresso-logica-uscita-attuatore;
- arresto di emergenza;
- ripari e interblocchi;
- barriere, scanner e OSSD;
- reset safety e prevenzione dell'avvio inatteso;
- EDM e monitoraggio degli elementi finali;
- STO nei drive;
- contattori e attuatori pneumatici safety;
- safety relay e safety PLC;
- PLC standard e diagnostica;
- HMI e stati safety;
- doppio canale e discrepanza;
- muting, bypass e override;
- modi operativi, setup e velocità ridotta;
- software safety e gestione delle modifiche;
- nomenclatura, tracciabilità ed evidenze.
La guida non insegna a scegliere un componente giallo né anticipa il calcolo del Performance Level.
Costruisce il prerequisito più importante:
definire correttamente la funzione prima di valutarne la prestazione.
Il volume include checklist professionali, casi operativi, matrici di controllo, criteri di evidenza e strumenti per trasferire la funzione al passaggio successivo: PLr, categorie, MTTF_D, DCavg, CCF e PFH_D.
Per progettisti elettrici, tecnici safety, programmatori PLC e safety PLC, commissioning engineer, collaudatori, manutentori, service, responsabili tecnici e studenti ITS/ITIS e ingegneria.
Non chiederti soltanto se il dispositivo safety funziona.
Chiediti:
Quale rischio deve ridurre? Quale stato fisico deve produrre? Dove termina la funzione? Come viene ripristinata? Quale evidenza dimostra che il risultato è quello previsto?
Questa è la differenza tra controllare un componente e comprendere professionalmente una funzione di sicurezza.
Sicurezza Funzionale Svelata fa parte della collana Schemi Elettrici Industriali Svelati - Professional Field Guides.
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