IsCommunicationError

Evaluate communication error flag

This instruction returns the value of the communication error flag. The communication error flag is TRUE if an error has occurred during serial communication at the communication port specified by Port.

Parameters

Input

Port (WORD, INT, UINT)

Specifies the communication ports depending on the PLC type:

COM port e.g. SYS_COM0_PORT
Ethernet port e.g. SYS_ETHERNET_USER_CONNECTION_1
MCU/SCU e.g. 16#xx01 (xx = slot number) in COM01

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: BOOL:=FALSE;
		bCommError: INT:=0;
	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,IsCommunicationError!,,5,1,16,4,,?DPort?C);
B(B_VARIN,,iPort,3,2,5,4,);
B(B_VAROUT,,bCommError,16,2,18,4,);
L(1,0,1,5);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

ST body

bCommError:=IsCommunicationError(Port := iPort);