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TCP/IP (Transmission Control Protocol/Internet Protocol)
A protocol suite which has been widely adopted for a number of applications, including the Internet and PLC communications.
Thermocouple
Thermocouples produce an output voltage which depends on the temperature difference between the junctions of two dissimilar metal wires.
Thumbwheel
Device used by an operator to enter a number between 0 and 9. Thumbwheels are combined to enter larger numbers. Thumbwheels typically output BCD numbers to a device.
Timer
Instruction used to accumulate time until a certain value is achieved. The timer then changes its output state.
TOP (technical and office protocol)
Communication standard that was developed by Boeing. Based on the contention access method. The MAP standard is meant for the factory floor and TOP is meant for the office and technical areas.
Transitional contact
Contact that changes state for one scan when activated.
Twinaxial Cable
A transmission line made up of a twisted pair of insulated conductors centered inside and insulated from a conductive shield.
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