Program instructions
7.17 Timer
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
335
Use
On-delay timers for a timing a single time interval.
Use
On-delay retentive timers for accumulating the time value of many timed
intervals.
Use the
Off-delay timer for extending a time interval past an OFF (or FALSE)
condition, such as a delay time for cooling a motor.
Timer number (T0 to T255)
I, Q, V, M, SM, S, T, C, L, Power Flow
IW, QW, VW, MW, SMW, SW, T, C, LW, AC, AIW, *VD, *LD, *AC, Constant
TON, TONR, and TOF timers are available in three resolutions. The resolution is determined
by the timer number, as shown below. Each unit of the current value is a multiple of the time
base. For example, a count of 50 on a 10 ms timer represents 500 ms of elapsed time.
Your Txxx timer number assignment determines the resolution of the timer. When a valid
timer number is assigned, the resolution is displayed in LAD or FBD timer boxes.
Timer number and resolution options
TON, TOF
TONR
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