Honeywell 900U02-0100 User And Installation Manual page 47

Use of properly configured managed switch is recommended to mitigate potential cyber-security/DOS
problems. Safety applications must include a properly configured Firewall. See page 32 for suggested
settings.
Redundant Networks
Honeywell Matrikon OPC Server supports redundant networks. Up to 10 connections may be distributed
in any combination across the controller's 2 network ports (E1 and E2). PC hosts may include, for
example, HMI supervisory software and/or Designer Software configuration software. Redundant ports
may be used in a simplex mode (non-redundant).
Peer-to-Peer Communication
Peer-to-peer communication enables any given ControlEdge HC900 Controller to request a peer
relationship with up to 32 other ControlEdge HC900 Controllers on the same subnet; 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):

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.)

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 ControlEdge HC900 Controller Function Block User Guide for
additional information.)

Safety Peer function blocks, which are included in control strategy (configuration file).
Safety Peer function blocks include Safety Peer Monitor, Safety Analog Import and Safety
Digital Import. Applicable for Safety controllers with version 6.300 and above.
An illustration of ControlEdge HC900 Controller Peer-to-Peer on a Local Area Network (LAN) is given
in Figure 20. Typically, a Router is used for interconnection to another network (LAN, WAN, or other).
However, Peer controllers must all be on the same subnet.
For additional details, refer to the ControlEdge HC900 Process & Safety Controller Safety Manual,
#51-52-25-153.
Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual
May 2019
33