Instruction Manual

151Publication 1753-UM001C-EN-P - March 2010 151
Chapter 16
Peer-to-peer Communication Overview
Introduction
Peer-to-peer
Communication Basics
Peer-to-peer communication is used for data exchange between two
or more controllers and distributed I/O on a GuardPLC Ethernet
network. The GuardPLC Ethernet network is certified for use in SIL 3
and Cat. 4 applications and is designed to carry safety-related data.
The controllers are usually connected via the Ethernet network, but
other means of communication, such as telephone lines or two-way
radios are also possible, using gateways from the Ethernet network to
the respective technology.
The Peer-to-peer protocol is primarily responsible for:
• the communication between controller CPUs, including
automatic connection setup.
• extended diagnostics.
• all safety-relevant features for correct data transfer.
Each controller is equipped with one or more 10/100 Base T Ethernet
ports. The High-level High-speed (HH) protocol is implemented in the
operating system of the GuardPLC 1200/1600/1800 controllers and of
the GuardPLC 2000 communication module (COM) and interacts with
the Ethernet port. The HH protocol is based on UDP/IP and IEEE
802.3 standards and is responsible for the collision-free data exchange
via standard Ethernet networks in various network topologies.
Topic Page
Peer-to-peer Communication Basics 151
Networking Limitations 152
Network Configuration 153
HH Protocol Parameters 153
Peer-to-peer Protocol Parameters 157
HH Network Profiles 161
Peer-to-Peer Network Profiles 168