Simple Timer (STMR) Instruction

Mnemonic (Keyboard Shortcut) = STMR

Icon / Button =

Purpose

Time - a duration or event.

Instruction Parameters

Parameter		Parameter Type	Requirements	Description
Time Up		Ladder Input	Must Have	Level-driven. Based on the selected Delay Setting, the Enable triggers the timing sequence.
Preset Value		Numerical Tag / Constant	Must Have	Desired Timer value to reach (0.01 seconds Time Base by default).
Current Value		Numerical Tag	Current Value or Done Tag must be specified	Current time of the Timer (0.01 seconds Time Base by default).
Done	On Delay	Boolean Tag		For On Delay operation, when the Current Value becomes Equal To or Greater Than the Preset Value, this bit will turn ON.
	Off Delay			For Off Delay operation, this bit will immediately turn ON once the Enable is turned ON. After the Enable is turned OFF, at this transition point, the Current Value increases, when the Current Value becomes Equal To or Greater Than the Preset Value, this bit is turned OFF.
On Delay Timer		Radio Button	Select One	When the Enable transitions from OFF to ON, the OnDelay Timer’s Current Value increases. Once the Enable is turned OFF, the timer resets to Zero(0).
Off Delay Timer				When the Enable transitions from ON to OFF, the Off Delay Timer’s Current Value increases. Once the Enable is turned ON, the timer resets to Zero(0).
User Structure		Checkbox	Optional	Select if Structures are used.

Note: On a power cycle or Stop/Run transition, the Off Delay Timer's Current Value will be reset to Zero(0).

Note: Tag Values are updated immediately as each Ladder Rung is executed, top to bottom. However, Tag Values representing physical Outputs are only applied to the physical Output after the END statement of the last Task to be scanned is reached. Outputs in Remote Base Groups have additional limitations regarding Update Intervals.

Note: Once the Current Value tag reaches the data type maximum value it will remain at this value until reset.

Instruction Configuration

When Simple Timer Instruction is selected the window shown below opens.

Parameter Configuration Table

Simple Timer

Instruction

(STMR)

Notes

Preset Value

Enter a Tag or Value for the desired Time duration in 0.01 secondTime base.

Current Value

Select a Tag for Current Value.

Done

Select a Boolean Tag for Done bit.

Use Structure

Select if Structures are used.

Application Example

For this example, a conveyor moves ice cream cones into position to be filled. When in position, the ice cream valve is opened and the Timer is started. When the Timer reaches the Preset Value, the ice cream valve closes.