Limit value monitoring

You can define two limit values for each analog input:

Limit 1
Limit 2

For each limit value, there is a variable of the same name in the process data. See Process image chapter. The variable shows whether the current measured value lies above or below the limit value.

Defining a limit value

Enter the limit value in the corresponding CoE parameter.

Value range: 0x8000 … 0x7FFF (-32768 … 32767)

Connection	CoE object		Parameter
X01	8100_hex	AI Settings Ch.1	13_hex	Limit 1
X01	8100_hex	AI Settings Ch.1	14_hex	Limit 2
X02	8110_hex	AI Settings Ch.2	13_hex	Limit 1
X02	8110_hex	AI Settings Ch.2	14_hex	Limit 2
X05	8120_hex	AI Settings Ch.3	13_hex	Limit 1
X05	8120_hex	AI Settings Ch.3	14_hex	Limit 2
X06	8130_hex	AI Settings Ch.4	13_hex	Limit 1
X06	8130_hex	AI Settings Ch.4	14_hex	Limit 2

Activating the monitoring

The limit value monitoring for both limit values is disabled in the factory setting.

Set the CoE parameter for the respective limit value to TRUE:

Connection	CoE object		Parameter
X01	8100_hex	AI Settings Ch.1	07	Enable limit 1
X01	8100_hex	AI Settings Ch.1	08	Enable limit 2
X02	8110_hex	AI Settings Ch.2	07	Enable limit 1
X02	8110_hex	AI Settings Ch.2	08	Enable limit 2
X05	8120_hex	AI Settings Ch.3	07	Enable limit 1
X05	8120_hex	AI Settings Ch.3	08	Enable limit 2
X06	8130_hex	AI Settings Ch.4	07	Enable limit 1
X06	8130_hex	AI Settings Ch.4	08	Enable limit 2

Evaluation

Evaluate the input variables "Limit 1" and "Limit 2" in the process data in accordance with the following table:

Variable value	Meaning
Variable value	"Swap limit bits" ¹⁾ = FALSE	"Swap limit bits" ¹⁾ = TRUE
0	Monitoring is not activated for this limit value.
1	The measured value is smaller than the limit value.	The measured value is greater than the limit value.
2	The measured value is greater than the limit value.	The measured value is smaller than the limit value.
3	The measured value is exactly the same size as the limit value.

¹⁾ "Swap limit bits" is a CoE parameter. "Swap limit bits" is FALSE in the factory setting.

Connection	CoE object		Parameter
X01	8100_hex	AI Settings Ch.1	0E_hex	Swap limit bits
X02	8110_hex	AI Settings Ch.2	0E_hex	Swap limit bits
X05	8120_hex	AI Settings Ch.3	0E_hex	Swap limit bits
X06	8130_hex	AI Settings Ch.4	0E_hex	Swap limit bits