The PLCnext Runtime

RSC Services

For PLCnext runtime features that are user configurable, configuration can usually be performed through either the web-based management interface, or modifying text files on the PLC.

Some PLCnext runtime features also provide an application programming interface (API) in the form of Remote Service Calls, or RSC Services.

A list of the RSC services that are available in the PLCnext runtime is given in Appendix B.

RSC services can be accessed at least in two ways:

• Using an SDK to link to the relevant C++ shared object libraries. This provides local access to RSC services running on the same device as the C++ client.
• Via gRPC, either locally via a Unix Domain Socket or remotely using Transport Layer Security (TLS).

In the next chapter, you will:

• Write your own PLCnext runtime component.
• Call RSC services from that component.