Figure 19 - Modular Network Structure - Honeywell HC900 Installation And User Manual
Process controller
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Also See for HC900:
- Reference manual (456 pages) ,
- User and installation manual (274 pages) ,
- Installation and user manual (228 pages)
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Components and Architecture - Ethernet Open Connectivity Network
Peer-to-Peer Communication
Peer-to-peer communication enables any given HC900 Controller to request a peer relationship with up to
32 other HC900 Controllers; other controllers can request a peer relationship with the controller. The total
number of peers that a controller can have a relationship with is 32. Peer-to-peer communication uses the
Ethernet Open Connectivity network and employs standard User Datagram Protocol (UDP) for fast and
efficient transfer of information. Peer-to-peer communication is based on fail-safe and data expiration
mechanisms that provide for fault and loading considerations without requiring reserved network
bandwidth allocation. Peer-to-peer is designed to be easy to configure as part of a device's standard
configuration and does not require the distribution of a global database.
With redundant controllers, peer-to-peer communication always stays with the Lead controller.
Implementing peer-to-peer communications involves:
• Interconnecting controllers with Ethernet media and networking devices (cables, switches, etc)
• Configuration (via Designer Software):
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Controller configuration, which includes entry of an IP address and a Subnet Mask, and a Controller
Name for each controller. (The Controller Name is used only by the Honeywell proprietary software
for network access between controllers; it should not be confused with a Network Domain Name or
Workgroup Name.)
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Peer Data Exchange (PDE) function blocks, which are included in the control strategy (configuration
file). PDE function blocks include PDE Control, PDE Write, and PDE Read. (Refer to the HC900
Process Controller Function Block User Guide for additional information.)
An illustration of HC900 Controller Peer-to-Peer on a Local Area Network (LAN) is given in Figure 19.
Typically, a Router is used for interconnection to another network (LAN, WAN, or other).
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Figure 19 – Modular Network Structure
HC900 Process Controller Installation and User Guide
Revision 19
06/14
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