40 00 00 Process Interconnections
40 60 00 Process Control and Enterprise Management Systems
40 61 00 Process Control and Enterprise Management Systems General Provisions 40 62 00 Computer System Hardware and Ancillaries 40 63 00 Control System Equipment 40 66 00 Network and Communication Equipment 40 67 00 Control System Equipment Panels and Racks 40 68 00 Process Control Software 40 69 00 Packaged Control Systems