Confuse with For Statement in Siemens SCL

Hello all,

I am Confusing with below equation. i express with blue color .Please kindly explain me below FOR ..., Where can i find good SCL manual for beginners???

y_index : INT := 10;
i : INT;

FOR i := 1 TO 32 DO
IF M(y_index,i) = TRUE; when i = y_index
THEN Total := Total + 1; Total := Total + 1???
END_IF;
END_FOR;

Many Thanks

Look at the declaration of M - this will reveal all.

Didn't see Declaration of M!

L D[AR2 said:

Look at the declaration of M - this will reveal all.

Click to expand...

I didn't see declaration of M in the whole Function Block. How can i find in help file? any help? Thanks!

Post the SCL source code for the FB as an attachment.

SCL source code of IF block

L D[AR2 said:

Post the SCL source code for the FB as an attachment.

Click to expand...

VAR_INPUT
Start : BOOL;
Manual : BOOL;
ActVal : INT;
END_VAR
VAR
Manual_FM : BOOL;
over : BOOL;
under : BOOL;
equal_to : BOOL;
Setpoint_man : INT := 1000;
Setpoint : INT;
Deviation : INT;
y_index : INT := 12;
Total : INT;
END_VAR

VAR_TEMP i : INT; END_VAR

BEGIN
//Simple IF branch
IF Start THEN Setpoint := 1200; END_IF;
IF Manual THEN
Setpoint := Setpoint_man;
Q4.0 := TRUE;
END_IF;

//Branch with THEN...ELSE
IF ActVal > Setpoint
THEN Deviation := ActVal - Setpoint;
ELSE Deviation := Setpoint - ActVal;
END_IF;


//Branch with ELSIF
IF ActVal > Setpoint
THEN over := TRUE;
under := FALSE;
equal_to := FALSE;
ELSIF ActVal < Setpoint
THEN under := TRUE;
over := FALSE;
equal_to := FALSE;
ELSE equal_to := TRUE;
over := FALSE;
under := FALSE;
END_IF;


//Edge evalaution (rising edge)
IF Manual AND NOT Manual_FM
THEN (*rising edge*);
END_IF;
Manual_FM := Manual; //Correct edge memory bit

//Counting bits set to "1"
Total := 0;
FOR i:=1 TO 32 DO
IF M[y_index,i] = TRUE
THEN Total := Total + 1;
END_IF;
END_FOR;

END_FUNCTION_BLOCK

After read some manual, my understanding is
IF M[y_index,i] = TRUE
// y_index = byte address
// i = bit address
// so If Memory Bit M10.1 to 32 is TRUE as y_index is start from 10
// Total = Total + 1

Am i Correct?

Thanks!

Your first post used round brackets, your second post used square brackets ?? Cut and paste is your friend.

M[BYTENO, BITNO] accesses Marker M bits.

L D[AR2 said:

Your first post used round brackets, your second post used square brackets ?? Cut and paste is your friend.

M[BYTENO, BITNO] accesses Marker M bits.

Click to expand...

I didn't notice round and square bracket until you pointing out. that was my mistake! first post i type it all. second post i cut and paste it. Thanks!