An Instrument Index (or Instrument Schedule) is a document containing list of instrument devices within a plant that includes the description and complete listing by tag numbers, procurement and installation information as well as loop drawing number and field installation details.
What is the instrument index?
Instrument index is a document containing list of instrument devices within a plant. Instrument index shall include tag number of all physical instruments (e.g. field instrument, physical alarm and indicator) and pseudo instruments which commonly named “soft tag” (e.g DCS indication, alarm, controller).
What are typical I O specifications?
Digital I/O SpecificationsDescriptionCPU: Differential (Sink or Source) DI/O: Sinking (Sourcing driver)Signal compatibility6 mA max at 5 VDC, 10 mA max at 24 VDCThreshold voltage2.75 VDC typical, 3 VDC maximumThreshold current2.7 mA typical, 3.2 mA maximumMax input voltage26.4 VDC5 more rows
What is not shown on a PFD?
The PFD displays the relationship between major equipment of a plant facility and does not show minor details such as piping details and designations.
What are the 4 types of I O?
Types of I/O Control MethodsProgrammed I/O. The programmed I/O method controls the transfer of data between connected devices and the computer. Interrupt-Based I/O. The interrupt-based I/O method controls the data transfer activity to and from connected I/O devices. Direct Memory Access (DMA) I/O. Channel I/O.Jul 14, 2020