CTUD_LINT block
Short summary
Name |
CTUD_LINT |
→POU type |
|
Category |
|
Conform to →IEC-standard |
no restrictions |
Graphical interface |
|
Available since |
version 1.19.0 (for logi.CAD 3) |
Functionality
The block is an up- and down-counter (for LINT values).
If there is a positive →edge at input CU, the counter is activated and increments the counter value by 1. If there is a positive edge at input CD, the counter is activated and decrements the counter value by 1.
If input R is →turned on, the counter value is reset to value 0. If input LD is turned on, the counter value is reset to the value entered at PV. If this value is reached or exceeded when counting up, output QU is set to value TRUE (or an equivalent). If the counter value reaches or falls below 0 when counting down, output QD is set to value TRUE (or an equivalent).
The incrementing is stopped, if the upper limit of LINT (= value 9,223,372,036,854,775,807) is reached. The decrementing is stopped, if the lower limit of LINT (= value -9,223,372,036,854,775,808) is reached.
Output CV returns the current counter value of the block.
In-/outputs
|
Identifier |
Description |
|
Inputs: |
CU |
BOOL |
increment in case of positive edge |
CD |
BOOL |
decrement in case of positive edge |
|
R |
BOOL |
flag for reset to value 0 |
|
LD |
BOOL |
flag for reset to value of PV |
|
PV |
LINT |
limiting value for counting up |
|
Outputs: |
QU |
BOOL |
flag showing whether limiting value is reached or not |
QD |
BOOL |
flag showing whether value 0 is reached or not |
|
CV |
LINT |
current counter value |
Input EN and output ENO are available when →calling the block. See "Execution control: EN, ENO" for information on input EN and output ENO.
Example for usage within ST-editor
PROGRAM Test
VAR
myCTUD : CTUD_LINT;
StartUpCnt : BOOL;
StartDownCnt : BOOL;
ResettoZero : BOOL;
ResettoValueOnPV : BOOL;
outUp : BOOL;
outDown : BOOL;
counter : LINT;
END_VAR
myCTUD(CU := StartUpCnt, CD := StartDownCnt, R := ResettoZero, LD := ResettoValueOnPV, PV :=
10
, QU => outUp, QD => outDown, CV => counter);
(* Instance of block
'CTUD_LINT'
is called: The up-counter is activated, when
'StartUpCnt'
is
'TRUE'
. The down-counter is activated, when
'StartDownCnt'
is
'TRUE'
. *)
(* The value
for
counting is reset to
'0'
, when
'ResettoZero'
is
'TRUE'
. It is reset to
'10'
, when
'ResettoValueOnPV'
is
'TRUE'
*)
(* The limiting value
for
counting up is
'10'
. *)
(* Appropriate variables access the outputs. *)
END_PROGRAM
When creating your application within the ST-editor, enter a call of a block by typing the text as requested by the syntax or use Content Assist.