IEC 1131-3 Instructions
10-12
S7-200 Programmable Controller System Manual
A5E00066097-02
Inputs/Outputs Operands Data Types
IN (LAD) Power Flow BOOL
IN (FBD) I, Q, M, SM,T, C, V, S, L, Power Flow BOOL
PT (LAD & FBD) VW, IW, QW, MW, SMW, LW, SW, AIW, AC, Constant, *VD, *AC, *LD INT
Q (LAD & FBD) I, Q, M, SM, V, S, L BOOL
ET (LAD & FBD) VW, IW, QW, MW, SMW, LW, SW, AQW, AC,*VD, *AC, *LD INT
Txxx Constant, refer to Table 10-3, page 10-12. TOF
Pulse Timer
The Pulse Timer function block is used to generate
pulses for a specific duration. As the enabling input (IN)
becomes true, the output bit (Q) turns on. The output bit
remains true for the pulse specified within the preset time
(PT). Once the elapsed time (ET) reaches preset (PT),
the output bit (Q) becomes false. The elapsed time (ET)
is maintained until the enabling input becomes false.
Once the output bit (Q) becomes true, it remains true
until the pulse time (PT) has elapsed.
For information about timer numbers and resolutions, refer to Table 10-3.
Inputs/Outputs Operands Data Types
IN LAD) Power Flow BOOL
IN (FBD) I, Q, M, SM, T, C, V, S, L, Power Flow BOOL
PT (LAD & FBD) VW, IW, QW, MW, SMW, LW, SW, AIW, AC, Constant, *VD, *AC, *LD INT
Q (LAD & FBD) I, Q, M, SM, S, V, L BOOL
ET (LAD & FBD) VW, IW, QW, MW, SW, SMW, LW, AQW, AC, *VD, *AC, *LD INT
Txxx Constant, refer to Table 10-3 TP
Understanding the IEC 1131-3 Timer Instructions
TON, TOF and TP timers are available in three resolutions. The resolution is
determined by the timer number and is shown in Table 10-3. 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.
Table 10-3 Timer Numbers and Resolutions
Timer Type
Resolution in
milliseconds (ms)
Maximum Value
in seconds (s)
Timer Number
TON, TOF,
1 ms 32.767 s T32, T96
TP
10 ms 327.67 s T33 to T36, T97 to T100
100 ms 3276.7 s T37 to T63, T101 to T255
L
A
D
TP
IN
Txxx
F
B
D
PT
Q
ET
222 224
✓✓✓
221 226
✓
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