ALPHA-VISION® API-Interface to Technology program: FC176

FC176

SUMMARY

The AbvSpu provides functions to read and write process attributes (status, measuring value, alarm information) as well as to control process parameters (limits, delay times, etc.).

PARAMETERS (IN)

obj (INT)

Object Number

iLmtNo (INT)

Limit number 1..7

PARAMETERS (OUT)

r4Lmt (REAL)

Limit

bOk (BOOL)

Status (1=okay, 0=error)

PARAMETERS (IN_OUT)

DESCRIPTION

GetLimit() - Reads Limit
The limit -specified by the parameter <iLmtNo>- of the analogue Measuring Point referenced by <obj> is returned

The function is defined for analogue Measuring Points (MP) only.

• For Objects of the type 'PV=Process Variables' and 'Binary-MP' 'bOk=0 (error)' is returned.
• Possible errors:
  • a) Invalid Object Number
  • b) Worong object type
  • c) rule for limits not obeyed

Description of the Output Parameters

Object Type	bOk	Remark
MP (analogue)	1	The limit defined by 'iLmtNo' must exist.
MP (binary)	0	-
PV	0	-