VIPA CP 1413plus, Manual

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CP1413plus manual H1 Driver V3.xx for Windows NT
Rev. 00/07 7-21
7.6.2 H1 Layer 4 programming interface
7.6.2.1 General notes on the H1 programming interface
The H1 programming interface provides direct access to the functions of level 4 A of the ISO level
model.
All the specified data is transferred "as is", i.e. no additional conversion occurs.
Before any station can be accessed a connection to the destination system must have been
established. This connection can then be used to exchange data with the destination system.
It is possible to establish multiple connections to different or even to the same system.
When one of these connections is no longer required it should be terminated.
All the required functions are located in dynamic link libraries (.dll).
- H1DLLNT.DLL, S5DLLNT.DLL
The following export libraries are supplied to provide the required interfaces for linking
with custom programs:
- H1DLLNT.LIB, S5DLLNT.LIB
These libraries were created and tested with + 4.0.
The type of connection is determined by the connection parameters. For the CP143plus these
parameters are defined on the PLC side by means of the parameter configuration program NCS.