2. Terms and Definitions The terms and definitions used in this guide are given below. Safety Network Number (SNN) A unique number assigned to the safety network. In the CIP Safety, it is used for uniquely identifying and mutually verifying a device in several EtherNet/IP network configurations. TUNID A 10-byte ID consisting of a 6-byte Safety Network Number and a 4-byte Node ID. It is used for uniquely identifying a device. Data Packet Interval (EPI) A data update cycle specified in ms to communicate safety process data between the originator and the target. safety application data The data that contains the settings that are used to operate an NX-series Safety Control Unit.
It consists of the safety programs, safety task, and variables. The data is created with Sysmac Studio and then is transferred and executed on a Safety CPU Unit. 2 Term Explanation and Definition