Publication 1762-RM001C-EN-P
8-4 Timer and Counter Instructions
TON - Timer, On-Delay
Instruction Type: output
Use the TON instruction to delay turning on an output. The TON
instruction begins to count time base 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 control and status bits:
EN
DN
TON
Timer On Delay
Timer T4:0
Time Base 1.0
Preset 0<
Accum 0<
TON
Table 8.5 Execution Time for the TON Instructions
Controller When Rung Is:
True False
MicroLogix 1200 18.0
µ
s3.0
µ
s
MicroLogix 1500 15.5
µ
s2.5
µ
s
Table 8.6 Timer Control and Status Bits, Timer Word 0 (Data File 4 is configured as a timer file for this example.)
Bit Is Set When: And Remains Set Until One of the
Following Occurs:
bit 13 - T4:0/DN DN - timer done accumulated value
≥
preset value rung state goes false
bit 14 - T4:0/TT TT - timer timing rung state is true and accumulated
value < preset value
•
rung state goes false
•
DN bit is set
bit15 - T4:0/EN EN - timer enable rung state is true rung state goes false
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