FB_LIMIT

Description Function Block

The FB_LIMIT function block is used to check whether the value at the AnalogIn input is within the predefined limits. If the value at AnalogIn is within the limits of MinValue and MaxValue, then the bInLimit output is set. If the value is greater than MaxValue, then the bAboveMax output is set. If the value is less than MinValue, then the bBelowMin output is set.

EL6900

The FB_LIMIT function block is not supported by the EL6900.

Table 44. VAR_INPUT

Name	Data Type	Initial Value	Description, Parameter Values
`AnalogIn`	`LINT`	`0`	Analog input value for the check Permitted data types: `UINT`, `INT`, `UDINT`, `DINT`
`MinValue`	`LINT`	`0`	Minimum value Permitted data types: `UINT`, `INT`, `UDINT`, `DINT` Constant value or variable permitted
`MaxValue`	`LINT`	`0`	Maximum value Permitted data types: `UINT`, `INT`, `UDINT`, `DINT` Constant value or variable permitted

Name

Data Type

Initial Value

Description, Parameter Values

AnalogIn

LINT

0

Analog input value for the check

Permitted data types: UINT, INT, UDINT, DINT

MinValue

LINT

0

Minimum value

Permitted data types: UINT, INT, UDINT, DINT

Constant value or variable permitted

MaxValue

LINT

0

Maximum value

Permitted data types: UINT, INT, UDINT, DINT

Constant value or variable permitted

Table 45. VAR_OUTPUT

Name	Data Type	Initial Value	Description, Parameter Values
`bInLimit`	`SAFEBOOL`	`FALSE`	`TRUE`: The `AnalogIn` value is within the minimum and maximum limit values.
`bBelowMin`	`SAFEBOOL`	`FALSE`	`TRUE`: The `AnalogIn` value is less than the minimum limit value.
`bAboveMax`	`SAFEBOOL`	`FALSE`	`TRUE`: The `AnalogIn` value is greater than the maximum limit value
`bError`	`SAFEBOOL`	`FALSE`	`TRUE`: `MinValue` is greater than `MaxValue`. `FALSE`: No error has occurred.