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2 In the SCL examples, "IEC_Timer_0_DB" is the name of the instance DB. TP, TON, and TONR:
Box: 0=Disable timer, 1=Enable timer
Coil: No power flow=Disable timer, Power flow=Enable timer
TOF:
Box: 0=Enable timer, 1=Disable timer
Coil: No power flow=Enable timer, Power flow=Disable timer
R Bool TONR box only:
0=No reset
1= Reset elapsed time and Q bit to 0
Box: PT
Coil: "PRESET_Tag"
Time Timer box or coil: Preset time input
Box: Q
Coil: DBdata.Q
Bool Timer box: Q box output or Q bit in the timer DB data
Timer coil: you can only address the Q bit in the timer DB data
Box: ET
Coil: DBdata.ET
Time Timer box: ET (elapsed time) box output or ET time value in the timer DB
data
Timer coil: you can only address the ET time value in the timer DB data. Changing PT has no effect while the timer runs.
 Changing IN has no effect while the timer runs.
TON  Changing PT has no effect while the timer runs.
 Changing IN to FALSE, while the timer runs, resets and stops the timer.
TOF  Changing PT has no effect while the timer runs.
 Changing IN to TRUE, while the timer runs, resets and stops the timer.
TONR  Changing PT has no effect while the timer runs, but has an effect when the timer resumes.
 Changing IN to FALSE, while the timer runs, stops the timer but does not reset the timer. Changing
IN back to TRUE will cause the timer to start timing from the accumulated time value.
PT (preset time) and ET (elapsed time) values are stored in the specified IEC_TIMER DB
data as signed double integers that represent milliseconds of time. TIME data uses the T#
identifier and can be entered as a simple time unit (T#200ms or 200) and as compound time
units like T#2s_200msThe negative range of the TIME data type shown above cannot be used with the timer instructions. Negative PT (preset
time) values are set to zero when the timer instruction is executed. ET (elapsed time) is always a positive value. The -(TP)-, -(TON)-, -(TOF)-, and -(TONR)- timer coils must be the last instruction in a LAD
network. As shown in the timer example, a contact instruction in a subsequent network
evaluates the Q bit in a timer coil's IEC_Timer DB data. Likewise, you must address the
ELAPSED element in the IEC_timer DB data if you want to use the elapsed time value in
your program. As long as the timer runs, the state of DB1.MyIEC_Timer.Q=1 and the Tag_Output value=1.
When the Tag_Time value has elapsed, then DB1.MyIEC_Timer.Q=0 and the Tag_Output
value=0. The TONR timer sets output Q to ON after a preset time
delay. Elapsed time is accumulated over multiple timing
periods until the R input is used to reset the elapsed
time. In the CPU, no dedicated resource is allocated to any specific timer instruction. Instead,
each timer utilizes its own timer structure in DB memory and a continuously-running internal
CPU timer to perform timing.
When a timer is started due to an edge change on the input of a TP, TON, TOF, or TONR
instruction, the value of the continuously-running internal CPU timer is copied into the
START member of the DB structure allocated for this timer instruction. This start value
remains unchanged while the timer continues to run, and is used later each time the timer is
updated. Each time the timer is started, a new start value is loaded into the timer structure
from the internal CPU timer.
When a timer is updated, the start value described above is subtracted from the current
value of the internal CPU timer to determine the elapsed time. The elapsed time is then
compared with the preset to determine the state of the timer Q bit. The ELAPSED and Q