On-Delay Timer Timers

Inputs/Outputs Operands Data Types
Txxx Constant (T32 T63, T97 T255) TON
IN (LAD) Power Flow BOOL
IN (FBD) I, Q, M, SM, T, C, V, S, L, Power Flow BOOL
PT VW, IW, QW, MW, SW, SMW, LW, AIW, AC, Constant, *VD, *AC, *LD INT
Q I, Q, M, SM, V, S, L BOOL
ET VW, IW, QW, MW, SW, SMW, LW, AQW, AC, *VD, *AC, *LD INT

Memory Ranges ENO Errors Instruction Support for S7-200 CPUs SIMATIC/International Mnemonics
The On-Delay Timer (TON) times up to the preset value when the enabling input (IN) becomes true. When the elapsed time (ET) is greater than or equal to the Preset Time (PT), the timer output bit (Q) turns on.

The output bit is reset when the enabling input becomes false. When the preset time (PT) is reached, timing stops and the timer is disabled.

TON, TOF, and TP timers are available in three resolutions. The resolution is determined by the timer number as shown in the chart below. Each count 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.

Timer Type Resolution Maximum Value Timer Number

TON, TOF, 1 ms 32.767 s T32, T96

TP 10 ms 327.67 s T33-T36, T97-T100

100 ms 3276.7 s T37-T63, T101-T255


Note:

You cannot share the same timer numbers for TOF, TP, and TON. For example, you cannot have both a TON T32 and a TOF T32.

Example: