GE RX3i - Ethernet Interfaces for Pacsystems Controllers; Rack-Based and Rx7 I Embedded Interfaces - Features; Figure 1: Ethernet Connection System Diagram

Chapter 1. Introduction
GFK-2224Q January 2017 3
1.3 Ethernet Interfaces for PACSystems Controllers
A PACSystems Ethernet Interface enables a PACSystems controller to communicate with other PACSystems
equipment and with Series 90 and VersaMax controllers. The Ethernet Interface provides TCP/IP
communications with other PLCs, host computers running the Host Communications Toolkit or CIMPLICITY
software, and computers running the TCP/IP version of the programming software. These communications use
the proprietary SRTP and Ethernet Global Data (EGD)
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protocols over a four-layer TCP/IP (Internet) stack.
The Ethernet Interface has SRTP client/server capability. As a client, the Interface can initiate communications
with other PLCs that contain Ethernet Interfaces. This is done from the PLC ladder program using the COMMREQ
function. As a server, the Ethernet Interface responds to requests from devices such as PLC programming
software, a Host computer running an SRTP application, or another PLC acting as a client.
Figure 1: Ethernet Connection System Diagram
Rack-based and RX7i Embedded Interfaces - Features
Note: The RX3i CPE305/CPE310/CPE330/CPE400 embedded Ethernet interface supports a subset
of these features. For a list of RX3i CPE305/CPE310 embedded Ethernet interface features,
refer to Section 1.3.2. For a list of RX3i CPE330/CPE400 embedded Ethernet interface
features, refer to Section 1.3.3.
▪ Full RX3i Controller programming and configuration services with inactivity timeout
▪ Periodic data exchange using Ethernet Global Data (EGD)
▪ EGD Commands to read and write PLC and EGD exchange memory over the network.
▪ TCP/IP communication services using SRTP
▪ SRTP Client (Channels)
▪ Modbus TCP Server, supporting Modbus Conformance classes 0, 1, and 2.
▪ Modbus TCP Client, supporting Modbus Conformance classes 0, 1, and Function Codes 15, 22, 23, and
24 for Conformance class 2.
▪ Redundant IP Addressing capability.
▪ Basic remote PLC monitoring from a web browser (RX7i CPU Ethernet interface only)
▪ Comprehensive station management and diagnostic tools
▪ Extended controller connectivity via IEEE 802.3 CSMA/CD 10Mbps and 100Mbps Ethernet LAN port
connectors.
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Effective with RX3i CPE305/CPE310 firmware version 8.30, EGD Class 1 is supported on the embedded Ethernet
Interface. Earlier versions do not support EGD.