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Chapter 16. Glossary 245

16. Glossary

The following terms are used in the I/O Driver Power Tool. Use these definitions to

help understand the explanations in this online Help system.

CSV file — a comma separated file that the I/O driver creates when it exports a

configuration file. Comma separated files can be edited in any third-party

application that supports .CSV files, such as Microsoft® Excel™ or a text

editor. Comma separated value files can also be created in a third-party

application and read by the I/O driver.

Exception-based processing — a method of processing only data that changes.

When exception-based processing is not used, all driver data is read at regular

intervals.

SAC can perform exception-based processing on datablock changes in

common memory, operator actions, and instructions from software

applications.

I/O address — a location in the process hardware (for example, a register, address, or

point) that the driver reads from and writes data to.

I/O driver — the software component responsible for sending data to and acquiring

data from the process hardware. The term, I/O Server, is sometimes used in

place of I/O driver.

Primary database blocks — the components within the process database that

communicate with field devices using an I/O driver.

Process database — a representation of your process stored in memory. The process

database is made up of process database blocks (tags). Database blocks are

units of instruction assigned to perform process functions.

Examples of process functions are: comparing process values against alarm

limits, performing calculations based on process values, and writing values to

the process hardware.

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