Ethernet/IP API Connector

Overview

The EtherNet/IP connector provides tag-based read and write access to any EtherNet/IP (CIP) compliant device via implicit I/O assemblies, using the Sres.Net.EEIP SDK. It also supports explicit, on-demand CIP attribute reads/writes via connector methods.

Every poll cycle reads the input assembly instance from the device and updates every subscribed tag from that one buffer, based on each tag's Address (see below). Output writes go through the output assembly instance whenever a tag's value changes.

The connector detects when the underlying session is lost and reconnects automatically without blocking the read cycle - reconnection runs on its own dedicated background thread. Since the EEIP client instance is reused across reconnects rather than recreated, the previous session is explicitly unregistered first (tolerating a failure there, since a session that's already broken is usually why the reconnect is happening in the first place).

Parameters

Supported Tag Types:

Writable (Out/InOut) tags of any of the above address forms are written back to the output assembly via SetInstance whenever their value changes.

Connector Methods

Addressing

The Address field of a tag follows one of the five formats described above, all relative to the configured input/output assembly buffer. For a one-off read/write against a specific CIP class/instance/attribute rather than the assembly buffer, use RunMethod("READDATA"/"WRITEDATA") instead.

Diagnostic Codes