Traditionally, most safety was built with relays and electric circuits (hardware based). This is still a possible solution and especially for smaller systems a cost effective alternative.
Programmable (software based) systems are used in increasing quantities. The advantages are that it is possible to create more flexible system in which assessments can be made more complex and zones overlap. Correct used this means that the operator will have a safer working environment and production is not stopped unnecessarily.
WIP Consulting manages both technologies and often a combination of hardware and software is the best solution.