7 Safety application examples7.1 OverviewIn this chapter, application examples based on PLCopen Safety POUs are presented with the main goal togive an explanation on how PLCopen Safety POUs can be used in typical safety applications. Examples areused from [7] with a permission from PLCopen organisation.Initialization procedures for handling PROFIsafe start-up behaviour and AC500-S specific POUs are notlisted in these examples, but have to be included in the final safety application programs, as it was men-tioned in the chapter “Checklist for creation of safety application program” (Ä Chapter 6.2 “Checklist for cre-ation of safety application program” on page 406).As an example of the usage of safety functions, the following production line is used (Fig. 133). It is state-of-the-art to use a programmable electronic system (PES) to realize the safety functions (versus hard-wired).The PLCopen FBs described below can be used to easily realize the safety application program.This production line includes the following:Fig. 133: Example of safety functionalities in a production line1 Centralized control cabinet, including the safetyrelated part of the control system where thesafety related function blocks are running.2 Infeed of material. In this example no specialsafety related functions are used. However,safety functionalities like muting to separatebetween products and persons could be used.3 Cutting of the material. For manual control a twohand control safety function (unit is in front of themachine) is added combined with a 2-fold doormonitoring system (attached to the door on themachine)4 Automatic printing station, with door monitoringas safety function in case of service access(attached to the door on the machine)5 First cartonning machine with door monitoring assafety function in case of service access(attached to the door on the machine). Some-times, the manual operation is necessary. In thiscase, the operator can run the machine with asafely limited speed controlled by an enablingdevice which, when released, initiates a safestop.Safety application examplesOverview30.03.2017 AC500-S 425
