IOF_LB_BreakLocationTest

IOF_LB_BreakLocationTest 1:

The IOF_LB_BreakLocationTest function block carries out a break location test in a Beckhoff Lightbus fiber-optic ring and can locate possible break locations. If no break location is detected during the test, the output variable BOXNO returns the current number of Lightbus modules in the ring. If a break location is detected before the NN-th module in front of the receiver input, the BREAK flag is set and the module number is provided via the output variable BOXNO. If the BOXNO variable returns a value of 0xFF the break location is situated immediately in front of the receiver input, and cannot be located.

Inputs

VAR_INPUT
    NETID     : T_AmsNetId;
    DEVICEID  : UDINT;
    START     : BOOL;
    TMOUT     : TIME := DEFAULT_ADS_TIMEOUT;
END_VAR

Name	Type	Description
NETID	T_AmsNetId	The network address of the TwinCAT computer on which the ADS command is to be executed can be specified here. For the local computer an empty string may be specified.
DEVICEID	UDINT	DeviceId specifies the I/O device on which the function is to be executed. The device IDs are specified by the TwinCAT system during the hardware configuration.
START	BOOL	The function block is enabled by a positive edge at this input.
TMOUT	TIME	Specifies the time-out period that must not be exceeded when the command is executed.

Outputs

VAR_OUTPUT
    BUSY    : BOOL;
    ERR     : BOOL;
    ERRID   : UDINT;
    BREAK   : BOOL;
    BOXNO   : WORD;
END_VAR

Name	Type	Description
BUSY	BOOL	When the function block is enabled, this output is set and remains set until a feedback is received.
ERR	BOOL	If an error should occur during the transfer of the command, then this output is set once the BUSY output was reset.
ERRID	UDINT	Returns the ADS error number when the ERR output is set.
BREAK	BOOL	This flag is set if a break location is detected in the fiber-optic ring.
BOXNO	WORD	The module number before the receiver input in front of which the break location has been detected.

Requirements

Development environment	Target platform	IO hardware	PLC libraries to be integrated (category group)
TwinCAT v3.1.0	None. This functionality is not supported by TwinCAT 3 at present!	Beckhoff Lightbus Master: C1220 ISA; FC200x PCI	Tc2_IoFunctions (IO)