General information
Generally, all the connection variants listed in this documentation are permitted for safety-relevant applications as long as the basic safety concept is met. This means you must ensure under all circumstances that the safe digital input is switched by an external safety relay or a safety controller. This must also prevent an automatic restart.
All safety conditions mentioned in sections 2, 3 and 4 of the present documentation must be met for the basic selection, installation, and application of the safety components, such as safety relay, EMERGENCY STOP switch, etc., and the approved connection variants.
The wiring diagrams are block diagrams whose only purpose is to show the safety function(s) with the relevant components. Circuit-related measures, which usually always have to be implemented additionally, are not shown in the diagrams to enhance clarity. Such measures are taken, for example, to ensure protection against contact, to handle overvoltage and undervoltage, to detect insulation faults, line-to-ground faults and short circuits, which can occur on externally installed lines, or to ensure the necessary immunity against electromagnetic interference.
