Rto - Retentive Timer, On-Delay - Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

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RTO - Retentive Timer,
On-Delay
RTO RTO
Retentive Timer On
Timer T4:0
Time Base 1.0
Preset 0<
Accum 0<
Counter Control and Status Bits, Timer Word 0 (Data File 4 is configured as a timer file for this example.)
Bit
bit 13 - T4:0/DN DN - timer done
bit 14 - T4:0/TT TT - timer timing
bit15 - T4:0/EN EN - timer enable
Instruction Type: output
EN
DN Execution Time for the RTO Instructions
Controller
MicroLogix 1100
Use the RTO instruction to delay turning "on" an output. The RTO begins
to count time base intervals when the rung conditions become true. As
long as the rung conditions remain true, the timer increments its
accumulator until the preset value is reached.
The RTO retains the accumulated value when the following occur:
• rung conditions become false
• you change the controller mode from run or test to program
• the processor loses power
• a fault occurs
When you return the controller to the RUN or TEST mode, and/or the
rung conditions go true, timing continues from the retained accumulated
value. RTO timers are retained through power cycles and mode changes.
Timer instructions use the following control and status bits:
Is Set When:
accumulated value
rung state is true and accumulated
value < preset value
rung state is true
To reset the accumulator of a retentive timer, use an RES instruction. See
RES - Reset on page 178.
When Rung Is:
True False
2.52 μs
2.74 (DN=1),
4.06 (DN=0) μs
And Remains Set Until One of the
Following Occurs:
≥
preset value the appropriate RES instruction is enabled
• rung state goes false, or
• DN bit is set
rung state goes false
Publication 1763-RM001C-EN-P - October 2009
Timer and Counter Instructions 173