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In this Safety Application Note, the basic safety principle "transient suppression" according to ISO 13849-2 for valves and solenoid from Festo is described.

In this Safety Application Note, the basic safety principle "Protection of the control circuit" according to ISO 13849-2 is described.

Safe Torque Off (STO), up to category 1, up to PL c;
PUS, up to category 2, up to PL d;
Channel 1 (working valve): 5/3-way valve, exhausted, electrically actuated, pilot actuated, mechanical spring, monitoring by limit switch drive.
Output test channel (operation pressure): 3/2-way valve, closed, electrically actuated, pilot actuated, mechanical spring.
Safety Application Note with a possible implementation of the safety sub-functions STO and PUS. Included is the basic circuit, safety-related block diagram, Sistema project, FluidDraw project, FluidSim project, characteristics of suitable products and a product list of suitable products from Festo.

The safety application notes contain Sistema project files. Additional notes are given here which are to be taken into account when adapting them to a specific project.

CH 2 (operation pressure): 3/2 directional control valve, closed, monitoring pressure switch
CH 2 (pilot pressure): 3/2 directional control valve, closed, monitoring pressure switch

STO, up to category 1, up to PL c;
PUS, up to category 3, up to PL e;
Channel 1 (working valve): 5/2 directional control valve, monostable, electrically actuated, pilot actuated, mechanical spring, limit switch drive
Channel 2 (operation pressure ): 3/2 directional control valve, monostable, electrically actuated, pilot actuated, mechanical spring, monitoring by pressure switch
Channel 2 (pilot pressure ): 3/2 directional control valve, monostable, electrically actuated, pilot actuated, mechanical spring, monitoring by pressure switch
Safety Application Note with a possible implementation of the safety sub-functions SDI and PUS. Included is the basic circuit, safety-related block diagram, Sistema project, FluidDraw project, characteristics of suitable products and a product list of suitable products from Festo.

STO, up to category 1, up to PL c;
PUS, up to category 3, up to PL e;
Channel 1 (working valve): 2x3/2 exhausted, electrically actuated, pilot actuated, mechanical spring, limit switch drive
Channel 2 (operation pressure ): 3/2 closed, electrically actuated, pilot actuated, mechanical spring, monitoring by pressure switch
Channel 2 (pilot pressure ): 3/2 closed, electrically actuated, pilot actuated, mechanical spring, monitoring by pressure switch
Safety Application Note with a possible implementation of the safety sub-functions STO and PUS. Included is the basic circuit, safety-related block diagram, Sistema project, FluidDraw project, characteristics of suitable products and a product list of suitable products from Festo.

In this Safety Application Note, possible circuits for the safe switch-off of individual valves in the various categories and PL are given.

PUS, category 3, PL e;
working valve (CH1): 5/2 bistable, electrically actuated, pilot actuated, monitoring by limit switch drive
operation pressure (CH2): 3/2 closed, electrically actuated, pilot actuated, mechanical spring, monitoring by pressure switch
Safety Application Note with a possible implementation of the safety sub-function PUS. Included is the basic circuit, safety-related block diagram, Sistema project, FluidDraw project, FluidSim project, characteristics of suitable products and a product list of suitable products from Festo.

PUS, category 2, PL d;
Channel 1 (working valve): 5/2 bistable, electrically actuated, pilot actuated, monitoring by limit switch drive
Output of test equipment OTE (operation pressure): 3/2 closed, electrically actuated, pilot actuated, mechanical spring
Safety Application Note with a possible implementation of the safety sub-function PUS. Included is the basic circuit, safety-related block diagram, Sistema project, FluidDraw project, FluidSim project, characteristics of suitable products and a product list of suitable products from Festo.

SDE, up to category 3...4, up to PL e;
PUS, up to category 3...4, up to PL e;
Subsystem: MS6-SV-...-D Soft-start / quick-exhaust valve
Safety Application Note with a possible implementation of the safety sub-functions SDE and PUS. Included is the basic circuit, safety-related block diagram, Sistema project, FluidDraw project, characteristics of suitable products and a product list of suitable products from Festo.

This document provides recommendations for measures to prevent failures due to common cause (CCF) in accordance with ISO 13849-1, Annex F.

SDE, up to category 4, up to PL e;
PUS, up to category 4, up to PL e;
Subsystem: MS6-SV-...-E Soft-start / quick-exhaust valve
Safety Application Note with a possible implementation of the safety sub-functions SDE and PUS. Included is the basic circuit, safety-related block diagram, Sistema project, FluidDraw project, characteristics of suitable products and a product list of suitable products from Festo.

This application note presents basic information about electromagnetic environments to improve understanding of the requirements for safety circuits in ISO 13849-1 Annex L. It also describes measures that can ensure the immunity of a safety circuit.

This application note provides possible interpretations of Annex L of ISO 13849-1. The requirements are described in simpler language and supplemented where necessary.

A page with links to the recommended application notes with definitions and circuits for the pneumatic safety sub-functions in the Festo Support Portal.

Application Note for the realization of the safety sub-functions safe torque off (STO) and prevention of an unexpected start-up (PUS) with category 1 and up to PL c. This Application Note contains possible circuits for 5/3, 3/2 and 2/2 directional control valves.

Application Note for the realization of the safety sub-functions safe stopping and closing (SSC) and prevention of an unexpected start-up (PUS) with category 1 and up to PL c. This Application Note contains possible circuits for 5/3, 3/2 and 2/2 directional control valves and delockable check valves.

Application Note for the realization of the safety sub-function prevention of an unexpected start-up (PUS) with category 1 and up to PL c. This Application Note contains possible circuits for 5/2 directional control valves.

Application Note for the realization of the safety sub-functions safe stop 1, time controlled (SS1-t), safe torque off (STO) and prevention of an unexpected start-up (PUS) with category 1 and up to PL c. This Application Note contains possible circuits for 5/3, 3/2 and 2/2 directional control valves.

Application Note for the realization of the safety sub-functions safe torque off (STO), prevention of an unexpected start-up (PUS) and safely-limited speed (SLS) with category 1 and up to PL c. This Application Note contains possible circuits for permanent oder switchable safely-limited speed (SLS).

Application Note for the realization of the safety sub-functions safe torque off (STO), prevention of an unexpected start-up (PUS) and safely-limited torque (SLT) with category 1 and up to PL c. This Application Note contains possible circuits for permanent oder switchable safely-limited torque (SLT).

Application Note for the realization of the safety sub-functions safe direction (SDI) and prevention of an unexpected start-up (PUS) with category 1 and up to PL c. This Application Note contains possible circuits for monostable 5/2 directional control valves.

Application Note for the realization of the safety sub-functions safe blocking (SB) and prevention of an unexpected start-up (PUS) with category 1 and up to PL c. This Application Note contains possible circuits together with the safety sub-functions safe torque off (STO) and safe equilibrium of torque (SET).

Application Note for the realization of the safety sub-functions safe equilibrium of torque (SET) and prevention of an unexpected start-up (PUS) with category 1 and up to PL c. This Application Note contains a possible circuit for 5/3 directional control valves and pressure regulators.

In safety-related pneumatic circuits, certain features of directional control valves should be taken into account. These can result in restrictions, but sometimes also enable interesting solutions.

Safe Torque Off (STO), up to category 1, up to PL c;
Prevention of unexpected start-up (PUS), up to category 1, up to PL c;
Working valve (CH1): 5/3-way, exhausted, electrically actuated, pilot actuated, mechanical spring;
Safety Application Note with a possible implementation of the safety sub-functions STO and PUS. Included is a description, basic circuit, safety-related block diagram, Sistema project, FluidDraw project, FluidSim project, characteristics of suitable products and a product list of suitable products from Festo.

Prevention of unexpected start-up (PUS), up to category 1, up to PL c;
Channel 1 (working valve): 5/2-way, bistable, electrically actuated, pilot actuated;
Safety Application Note with a possible implementation of the safety sub-function PUS. Included is the basic circuit, safety-related block diagram, Sistema project, FluidDraw project, FluidSim project, characteristics of suitable products and a product list of suitable products from Festo.

Safe Stopping and Closing (SSC), up to category 1, up to PL c;
Prevention of unexpected start-up (PUS), up to category 1, up to PL c;
Channel 1: piloted check valve; 2 x 3/2-way, closed, electrically actuated, pilot actuated, mechanical spring;
Safety Application Note with a possible implementation of the safety sub-functions SSC and PUS. Included is the basic circuit, safety-related block diagram, Sistema project, FluidDraw project, FluidSim project, characteristics of suitable products and a product list of suitable products from Festo.

Safe Stopping and Closing (SSC), up to category 1, up to PL c;
Prevention of unexpected start-up (PUS), up to category 1, up to PL c;
Channel 1: 2/2-way, closed; 2 x 3/2-way, exhausting, electrically actuated, pilot actuated, mechanical spring;
Safety Application Note with a possible implementation of the safety sub-functions SSC and PUS. Included is the basic circuit, safety-related block diagram, Sistema project, FluidDraw project, FluidSim project, characteristics of suitable products and a product list of suitable products from Festo.

Safe Direction (SDI), up to category 1, up to PL c;

Prevention of unexpected start-up (PUS), up to category 1, up to PL c;
Working valve (CH1): 5/2-way, monostable, electrically actuated, pilot actuated, mechanical spring;
Safety Application Note with a possible implementation of the safety sub-functions SDI and PUS. Included is a description, basic circuit, safety-related block diagram, Sistema project, FluidDraw project, FluidSim project, characteristics of suitable products and a product list of suitable products from Festo.