(target unique network identifier) A value that uniquely identifies the connection target device on a CIP safety network. The TUNID consists of:

• a safety network number (SNN), which can be a timestamp or other user-defined value.

• a safety configuration identifier (SCID), also called the configuration signature, that is created in a vendor provided safety network configuration tool (SNCT) and consists of:

  • a Safety Configuration CRC (SCCRC), which is a CRC value of the safety device configuration settings, in the form of a hex value consisting of 4 octets.

  • a Safety Configuration Time Stamp (SCTS), which is a date and time hexadecimal value timestamp that consists of 6 octets.