F143_IORF

Partial I/O update

Updates the inputs or outputs specified by the value of d1_Start (starting word address) and the value of d2_End (ending word address) immediately after the trigger EN is in the ON-state even in the program execution stage.

Parameters

Input

d1_Start (WORD, INT, UINT): starting word address
d2_End (WORD, INT, UINT): ending word address

Remarks

Using this instruction, you can update inputs or outputs without the time-lag caused by scanning.

The same type of operand should be specified for d1_Start and d2_End.

FP2, FP2SH, FP3 /5 /10 /10SH (PLCs with backplanes)

Specify the word address as 0 £d1_Start£d2_End£ 127.If only WX10 (or WY10) are to be updated based on the I/O-address configuration, d1_Start and d2_End will be set as follows: d1_Start = 10 and d2_End = 10.
Set the same word address in d1_Start and d2_End to update only 1 word.

The partial I/O update instruction is executed only for the I/O units on the master backplane or expansion backplane. It is not executed for the I/O unit in the slave station of the Remote I/O System.

FP-S, FP0 (PLCs without backplanes)

The instruction F143_IORF updates the inputs and outputs specified by d1_Start (starting word address) and d2_End (ending word address) immediately after the trigger turns ON even in the program execution stage.

NOTE

With the FP0 and FP-S, refreshing initiated by the IORF command is done only for the control unit.
If d1_Start and d2_End are variables and not constants, then the compiler automatically accesses the variables' values via the index register.
The same type of operand should be specified for d1_Start and d2_End.
With input refreshing, WX0 should be specified for d1_Start and d2_End.
With output refreshing, WY0 should be specified for d1_Start and d2_End.

Example

POU header

All input and output variables used for programming this function have been declared in the POU header. The same POU header is used for all programming languages.

	VAR
		start: BOOL:=FALSE;
			(*activates the funtion*)
		FirstRefreshAddr: INT:=10;
		LastRefreshAddr: INT:=10;
	END_VAR

POU body

When the variable start changes from FALSE to TRUE, the function is carried out.

To update WX10 and WY10 based on the master I/O map configuration, set d1 = 10 and d2 = 10.

LD body

BODY
    WORKSPACE
        NETWORK_LIST_TYPE := NWTYPELD ;
        ACTIVE_NETWORK := 0 ;
    END_WORKSPACE
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 5 ;
        NETWORK_BODY
B(B_CONTACT,,start,5,1,7,3,);
B(B_F,F143_IORF!,Instance,9,0,16,5,,?DEN?Dd1_Start?Dd2_End?AENO);
B(B_VARIN,,FirstRefreshAddr,7,2,9,4,);
B(B_VARIN,,LastRefreshAddr,7,3,9,5,);
L(1,2,5,2);
L(1,0,1,5);
L(7,2,9,2);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

ST body

(* PLCs with backplanes  FP-C/FP2/FP2SH/FP3/FP10SH *)
IF start then
    (* Updates the input/output of word no. 0 to 1 *)
    F143_IORF( 0, 1);
END_IF;
(* PLCs without backplanes FP0, FP-Sigma *)
IF start then
    (* Updates the input/output of word no. 0 to 1 *)
    F143_IORF(WX0, WX1);
    F143_IORF(WY0, WY1);
END_IF;