Reading (Rnp) And Writing (Wnp) System Or User Variables - Siemens SINUMERIK 828D Commissioning Manual

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Programming commands

6.3 Functions

Reading (RNP) and writing (WNP) system or user variables

The RNP (Read NC PLC) command can be used to read NC or PLC variables or machine

Description:

VAR2=RNP("$AA_IN[2]")

The WNP (Write NC PLC) command can be used to write NC or PLC variables or machine

NC/PLC variables are accessed anew every time the WNP function is executed, i.e., NC/PLC

access is always executed in a CHANGE method. It is advisable to use this option in cases

where a system or user variable changes value frequently. If an NC/PLC variable is to be

accessed only once, then it must be configured in a LOAD or UNLOAD method.

Description:

WNP("DB20.DBB1",1)

System or user variable", value )

Reads NC or PLC variable or machine data

System or user varia‐

Name of NC or PLC variable

Value that is to be written to the system or user variable.

If the value is a String type, it must be written in double

quotation marks.

; Read NC variable

("System or user variable", value)

Writes NC or PLC variable or machine data

System or user variable

; Write PLC variable

Name of NC or PLC variable

Value that is to be written to the system or user var‐

If the value is a String type, it must be written in dou‐

ble quotation marks.

SINUMERIK Integrate Run MyScreens

Programming Manual, 10/2015, 6FC5397-3DP40-5BA3

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