Allen-Bradley 1756-CNB User Manual page 22

22 ControlLogix Redundancy System Overview
Parameter
Chassis Size
Chassis Layout
System Redundancy
Modules
Controllers
ControlNet Modules
Publication 1756-UM523F-EN-P - December 2006
Redundant Chassis Configuration
Criteria
Same size chassis for each pair of redundant chassis.
• Only these modules in each redundant chassis:
• Controllers
• ControlNet modules
• EtherNet/IP modules
• System redundancy module (needs 2 slots)
• Each chassis within a redundant pair looks the same.
• Identical modules (same catalog number, series, revision, and memory size)
• Same slot assignments
1757-SRM module:
• 1 in each redundant chassis
• Needs 2 slots
• Needs 1757-SRCx cable [1 m (3 ft), 3 m (9 ft), 10 m (30 ft), 50 m (150 ft), and 100 m (300 ft)]
ControlLogix5555, ControlLogix5561, ControlLogix5562, or ControlLogix5563 controllers
• Which type of controller do you want to use?
• If ControlLogix5555, then 1 or 2 controllers in each redundant chassis.
• If ControlLogix5561, ControlLogix5562, or ControlLogix5563, then only 1 controller in
each redundant chassis.
• Same type of controller throughout the chassis.
• Enough memory for 2 copies of all data.
• 7 connections for redundancy.
1756-CNB/D/E or 1756-CNBR/D/E module or modules:
• CPU usage ≤ 75%.
• CNB modules have the same keeper information.
• ≤ 5 CNB modules. See also parameter .
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