186 Rockwell Automation Publication 1756-UM001M-EN-P - February 2012
Chapter 12 Redundant Systems
System Considerations
When you are configuring a redundant ControlLogix system, these
considerations specific to modules in the redundant chassis must be made.
For complete information about designing and planning modules for use in your
redundant ControlLogix chassis, see the ControlLogix Enhanced Redundancy
User Manual, publication 1756-UM535
.
Items in Primary and
Secondary Chassis
Consideration
ControlLogix controller • When configured for redundancy, the secondary controller automatically receives and buffers data.
• A redundant controller uses twice as much data memory and I/O memory space as a nonredundant controller.
• A redundant controller has a significantly longer scan time than a nonredundant controller.
• The ControlLogix Enhanced Redundancy User Manual, publication 1756-UM535, provides detailed information about minimizing the scan
time impact.
• You do not need a redundancy-specific version of RSLogix 5000 software, but it must match your Enhanced Redundancy System revision
level.
Communication modules • As many as seven communication modules can reside in a redundant controller chassis, in any combination of EtherNet/IP modules and
ControlNet modules.
• To connect to other networks, bridge through another ControlLogix chassis outside the redundant system.
• For best results, use a separate networks for HMI and I/O communication.
I/O modules • All I/O is remote from the redundant controller chassis.
• Beginning with Enhanced Redundancy System revision 19.50, EtherNet/IP networks in redundant systems can be used for remote I/O or
produced/consumed data.
Redundant power supplies The 1756-PA75R and 1756-PB75R redundant power supplies provide reliable chassis power.
Redundant ControlNet media Redundant media provide more reliable ControlNet communication.
To Next Page
Loading...
Need help?
General
