Limit value monitoring

You can define two limit values for each analog input:

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

Defining a limit value

Enter your limits in the corresponding CoE parameter "Limit 1" and "Limit 2".

The permissible value range is -32768 to +32767 (0x8000 ... 0x7FFF).

Channel

"Limit 1"

"Limit 2"

1

0x8010:13

0x8010:14

2

0x8020:13

0x8020:14

Activating the limit value monitoring

In the factory setting, the limit value monitoring is disabled.

You can enable limit monitoring for each input individually by setting the corresponding CoE parameter "Enable Limit 1/2" to TRUE:

Channel

"Enable limit 1"

"Enable limit 2"

1

0x8010:07

0x8010:08

2

0x8020:07

0x8020:08

Evaluation

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

Value

Meaning

For "Swap limit bits" 1) = FALSE

For "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.

Channel

"Swap limit bits"

1

0x8010:0E

2

0x8020:0E