scope:

This International Standard specifies principles for the design and selection - independent of the nature of the energy source - of interlocking devices associated with guards. It also provides requirements specifically intended for electrical interlocking devices. This International Standard covers the parts of guards which actuate interlocking devices. NOTE Requirements for guards are given in ISO 14120. The processing of the signal from the interlocking device to stop and immobilize the machine is dealt with in ISO 13849-1. This International standard is intended to provide measures to minimize defeat of interlocking devices in a reasonably foreseeable manner.