Limit value monitoring

Limit value monitoring adds up to six monitorable limits to an interface. The limit value to be monitored is set via the *Lim variable by an operator (e. g. via OPC UA). Monitoring is enabled via the respective *En variable. If the upper limit values are exceeded or the lower limit values are not reached, the respective output *Act is set to TRUE.

Inputs

Name	Type	Description	OPC UA access
*AHEn	BOOL	Monitor limit `Alarm High`: 1: monitoring active 0: no monitoring	Read
*ALEn	BOOL	Monitor limit `Alarm Low`: 1: monitoring active 0: no monitoring	Read
*WHEn	BOOL	Monitor limit `Warning High`: 1: monitoring active 0: no monitoring	Read
*WLEn	BOOL	Monitor limit `Warning Low`: 1: monitoring active 0: no monitoring	Read
*THEn	BOOL	Monitor limit `Tolerance High`: 1: monitoring active 0: no monitoring	Read
*TLEn	BOOL	Monitor limit `Tolerance Low`: 1: monitoring active 0: no monitoring	Read

Outputs

Name	Type	Description	OPC UA access
*AHAct	BOOL	`Alarm High` limit exceeded.	Read
*ALAct	BOOL	`Alarm Low` limit not reached.	Read
*WHAct	BOOL	`Warning High` limit exceeded.	Read
*WLAct	BOOL	`Warning Low` limit not reached.	Read
*THAct	BOOL	`Tolerance High` limit exceeded.	Read
*TLAct	BOOL	`Tolerance Low` limit not reached.	Read

External variables

Name	Type	Description	OPC UA access
*AHLim	REAL / DINT	`Alarm High` limit	Read/write
*ALLim	REAL / DINT	`Alarm Low` limit	Read/write
*WHLim	REAL / DINT	`Warning High` limit	Read/write
*WLLim	REAL / DINT	`Warning Low` limit	Read/write
*THLim	REAL / DINT	`Tolerance High` limit	Read/write
*TLLim	REAL / DINT	`Tolerance Low` limit	Read/write