176461 User Manual.book

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MicroLogix 1500 Programmable Controllers User Manual

TON - Timer, On-Delay

Instruction Type: output

Table 13-5: Execution Time for the TON Instructions

Instruction

TON

When Rung Is:

True

15.48

µ s

False

1.14

µ s

Use the TON instruction to delay turning on an output. The TON instruction begins to count timebase intervals when rung conditions become true. As long as rung conditions remain true, the timer increments its accumulator until the preset value is reached. When the accumulator equals the preset, timing stops.

The accumulator is reset (0) when rung conditions go false, regardless of whether the timer has timed out. TON timers are reset on power cycles and mode changes.

Timer instructions use the following status bits:

Table 13-6: Timer Status Bits, Timer Word 0 (Data File 4 is configured as a timer file for this example.) bit 13 - T4:0/DN bit 14 - T4:0/TT bit15 - T4:0/EN

Bit

DN - timer done

TT - timer timing

EN - timer enable

Is Set When:

accumulated value

≥ preset value rung state goes false rung state is true and accumulated value < preset value rung state is true

And Remains Set Until One of the

Following Occurs:

rung state goes false

DN bit is set rung state goes false

13-4

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