<< Click to Display Table of Contents >>
Manual > Server Creation Guide > Interface > IPLink-Interface > IPLinkClient Library > IPLinkClient Library Reference > Method >
Reads the value of a tag.
syntax
AxIPLink1.ReadVal(
TagPath,
&Value,
DataSource
)
Parameters
TagPath
Type:
String
Tag path, e.g. U01.F01.T01
&Value
Object
The read value. Valid only when the return value is True.
Numeric
0 – client cache value. 1 – server cache value. 2 – device value.
Return Value
Boolean
FALSE - Failure. TRUE - Success.
Before reading the value with the ReadVal method,AddTagThe tag must be registered using the method.
DataSource When set to "0", the value is obtained from the client cache.
DataSource When set to "1", the value is obtained from the server cache.
When DataSource is "2", the value of the PLC device is obtained.
For details, see "Client Cache and Server Cache".
reference
AddTag
ActiveTag
