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PLC Glossary

AC/DC I/O interface. A discrete interface that converts alternating current (AC) voltages from field devices into direct current (DC) signals that the processor can use. It can also convert DC signals into proportional AC voltages. action. A set of control instructions prompting a PLC to perform a certain control function during the execution of a sequential function chart step. acyclic message. An unscheduled message transmission. A/D. See analog-to-digital converter. address. (1) The location in a computer’s memory where particular information is stored. (2) The alphanumeric value used to identify a specific I/O rack, module group, and terminal location. addressability. The. | Glossary of Terms used in Programmable Controller-based Systems From Industrial Text and Video Co. the leader in Electrical Motor Control and PLCs Video Training Programs www.industrialtext.com 1-800-752-8398 Glossary Glossary A AC DC I O interface. A discrete interface that converts alternating current AC voltages from field devices into direct current DC signals that the processor can use. It can also convert DC signals into proportional AC voltages. action. A set of control instructions prompting a PLC to perform a certain control function during the execution of a sequential function chart step. acyclic message. An unscheduled message transmission. A D. See analog-to-digital converter. address. 1 The location in a computer s memory where particular information is stored. 2 The alphanumeric value used to identify a specific I O rack module group and terminal location. addressability. The total number of devices that can be connected to a network. address field. The sequence of eight or any multiple of eight bits immediately following the opening flag sequence of a frame which identifies the secondary station that is sending or is designated to receive the frame. AI. See artificial intelligence. algorithm. A set of procedures used to solve a problem. alphanumeric code. A character string consisting of a combination of letters numbers and or special characters used to represent text commands numbers and or code groups. ambient temperature. The temperature of the air surrounding a device. American National Standards Institute ANSI . A clearinghouse and coordinating agency for voluntary standards in the United States. American Wire Gauge AWG . A standard system used to designate the size of electrical conductors. Gauge numbers have an inverse relationship to size larger gauges have a smaller diameter. analog device. An apparatus that measures continuous information signals i.e. signals that have an infinite number of values . The only limitation on resolution is the