CIPRNet CIP glossary
It has some similarities to Petri Nets as it also has places, tokens and transitions (called actions in LAMPS). Places can contain tokens that represent some data. There are rules associated with each action that invoke the actions under certain conditions. These actions get tokens as input data and may create one or several tokens as output. LAMPS can be used to describe all kinds of user-specified behaviour (component behaviour, scenario behaviour and fault behaviour).