Timer; Timer Instructions - Siemens SIMATIC S7 System Manual

7.17

Timer

7.17.1

Timer instructions

LAD / FBD STL
TON Txxx, PT
TONR Txxx, PT Use TONR On-delay retentive timers for accumulating the time value of many timed
TOF Txxx, PT
Input / output Data type
Txxx WORD
IN BOOL
PT INT
Timer resolution
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.
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
Description
Use TON On-delay timers for a timing a single time interval.
intervals.
Use the TOF Off-delay timer for extending a time interval past an OFF (or FALSE)
condition, such as a delay time for cooling a motor.
Operand
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
Program instructions
7.17 Timer
377