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For itemized control system devices such as IOCs, crates, and network switches, the Position Field contains a 2-character Subsystem Prefix, followed by a 2-digit Index from 01 to 99. (A description of the tiki-download_wiki_attachment.php?attId=139IOC naming convention is available here.) The Prefix designates a subsystem of the control system as follows in Table 1.12. The format of the control system devices is <ioc type>:<area>:<subsystem prefix>## The definition for each of the above field can be found in able 1.12.1.
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