OBIOLimitSwitch (FB)

FUNCTION_BLOCK OBIOLimitSwitch EXTENDS AbbLConCA

A binary output can be switched on/off with respect to a counter value.

It is possible to use the OBIOLimitSwitch with respect to CounterValue from: OBIOEncoderCounter (FB), OBIOForwardCounter (FB) or OBIOPulseTrainOutput (FB)

precondition

the respective channel is configured as limit switch, and also a counter channel has to be configured.

Up to 8 limit-switches are possible.

The respective counter is linked to the block by “Counter” input. The counter can be of type OBIOEncoderCounter, OBIOForwardCounter or OBIOPulseTrainOutput

The binary output is switched on when LowerLimitOn<=CounterValue<=UpperLimitValue

The binary output is switched on/off independently from PLC cycle with a delay of <10 microseconds.

Note

This block should just be called once per cycle otherwise inconsistent values could be send to PRU, if send twice in short time.

InOut:

Scope	Name	Type	Initial	Comment	Inherited from
Input	Enable	BOOL	FALSE	A rising edge (Enable = TRUE) starts the operation, the output Busy goes to TRUE. All other inputs are read and considered continuously. A falling edge (Enable = FALSE) aborts the operation. During Aborting the Busy is still TRUE. Afterward all outputs are reset.	AbbLConCA
Output	Busy	BOOL	FALSE	Operation is running (while output Error is FALSE)	AbbLConCA
	Error	BOOL	FALSE	Operation is stopped with error (while output Busy is FALSE). This output is TRUE for at least one cycle or until Enable is set to FALSE. The output ErrorID gives more details about the error.	AbbLConCA
Input	Channel	BYTE		0..7
	Signal	BOOL		Selects whether corresponding output should be high or low when counter is between UpperLimitOn and LowerLimitOn
	UpperLimitOn	UDINT		Upper limit UpperLimitOn > LowerLimitOn
	LowerLimitOn	UDINT		Lower limit LowerLimitOn < UpperLimitOn
Inout	Counter	OBIOBaseCounter		link the block to the counter which will be used to trigger the output
Output	ErrorID	Error_ID		Error Code
	State	BOOL		reflects the state of the binary output related to LimitSwitch