stackint

 Function Block - Manages a stack of DINT integers.

Inputs

Input	Data Type	Range	Unit	Default	Description
PUSH	BOOL				Command: When changing from FALSE to TRUE, the value of IN is pushed on the stack.
POP	BOOL				Pop command: When changing from FALSE to TRUE, deletes the top of the stack.
R1	BOOL				Reset command: If TRUE, the stack is emptied and its size is set to N.
IN	DINT				Value to be pushed on a rising pulse of PUSH.
N	DINT				Maximum stack size. Cannot exceed 128.

Outputs

Output	Data Type	Range	Unit	Description
EMPTY	BOOL			TRUE if the stack is empty.
OFLO	BOOL			TRUE if the stack is full.
OUT	DINT			Value at the top of the stack.

Remarks

• Push and pop operations are performed on rising pulse of PUSH and POP inputs.
• The specified size (N) is taken into account only when the R1 (reset) input is TRUE.

FBD Language Example

FFLD Language Example

• In the FFLD language, the input rung is the PUSH command.
  • The output rung is the EMPTY output.

IL Language Example

Not available.

ST Language Example

(* MyStack is a declared instance of STACKINT function block *)
MyStack (PUSH, POP, R1, IN, N);
EMPTY := MyStack.EMPTY;
OFLO := MyStack.OFLO;
OUT := MyStack.OUT;

See Also

• average / averageL
• derivate
• hyster
• integral
• lim_alrm