IsF145F146NotActive

Evaluate "F145/F146 not active" flag

This instruction returns the value of the "F145/F146 not active" flag. It is TRUE if the execution of an F145 or F146 instruction is possible because neither instruction is active.

Parameters

Input

Port (WORD, INT, UINT): Communication port: 1, 2

Remarks

Evaluation of the "F145/F146 not active" flag

The F145 or F146 instructions can only be executed if neither instruction is active. Evaluate the "F145/F146 not active" flag in your program to check the state of the instructions. The flag can be evaluated using one of the following instructions or system variables:

IsF145F146NotActive
sys_bIsComPort1F145F146NotActive
sys_bIsComPort2F145F146NotActive

For communication ports not supporting the master function, the flag is always TRUE.

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
		iPort: INT:=0;
		bF145F146NotActive: BOOL:=FALSE;
	END_VAR

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_F,IsF145F146NotActive!,,6,1,17,4,,?DPort?C);
B(B_VARIN,,iPort,4,2,6,4,);
B(B_VAROUT,,bF145F146NotActive,17,2,19,4,);
L(1,0,1,5);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

ST body

bF145F146NotActive:=IsF145F146NotActive(Port := iPort);