Flashcards
PLC Timers
Cards in this deck (13)
- 1advantage PLC timers instead of relay-based timing methodsEase of making settings changes.
-Ease of expansion.
High degree of accuracy and repeatability. - 2Control Logix How many bits32 bit
- 3accumulated time value (.ACC)accumulated count of the timing function when its rung is in a true state.
- 4upper byte contains three control bitsEN
TT
DN - 5Word 0 is the control wordLower byte is reserved for internal use by the PLC.
- 6Enable (EN) bitbit is true whenever the rung of the timer instruction is true. It is low whenever the rung is false.
- 7Timer-timing (TT) bitbit is true whenever the timer’s accumulated value is changing.
- 8Done (DN) bitFor TON and RTO this bit is true
whenever the accumulated value reaches the preset value - 9time basetime base is used to determine the interval at which the timer will time-out
- 10TON instructionchanging its “contacts” after a preset duration after “energizing.
- 11TON instructionnon-retentive timer
- 12TOFwill begin its timing function whenever the input conditions to the instruction becomes false
- 13TOF TIMERThe done bit (DN) will remain true until the .ACC value reaches the .PRE value.
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- Electrical (Programming timers) Flashcards on PLC Timers, created by Orlando Banks on 31/01/2017.
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- Orlando Banks
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