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Operands
TOF, TON and TP have the same input and output parameters, except for the instance variable,
which must be the same type as the instruction.
Note: Writing or forcing values to the instance data elements IN, PT, Q, ET, ENO or TI may cause
erratic operation of the timer function block.
Parameter Description
????
Structure variable containing the internal
data for the timer instance. (Refer to Data
Required for Standard Timer Function Blocks.)
IN
Timer input. Controls when the timer will
accumulate time.
TON and TP will begin to time when IN
transitions from OFF to ON.
TOF will begin to time when IN transitions
from ON to OFF.
PT
Preset time (in ms). Indicates the amount of
time the timer will time until turning Q either
ON or OFF, depending on the timer type.
Setting PT to 0 resets the timer.
Q
Timer output. Action depends on the timer
type.
When TP is timing, Q is ON.
When TON is done timing, Q turns ON.
When TOF is done timing, Q turns OFF.
ET
Elapsed time. Indicates the length of time, (in
ms), that the timer has been measuring time.
GFK-2950C
Chapter 4. Ladder Diagram (LD) Programming
Allowed Types
TOF, TON, or TP.
Must be same type
as the instruction.
Flow
DINT
Flow
DINT
February 2018
Allowed Operands Optional
NA
No
NA
Yes
All except S, SA, SB,
Yes
SC
NA
Yes
All except S, SA, SB,
Yes
SC and constants
229
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