Allen-Bradley 1756-CNB/E, User Manual

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Publication 1756-UM523F-EN-P - December 2006
22 ControlLogix Redundancy System Overview
Redundant Chassis Configuration
Parameter Criteria Page
Chassis Size Same size chassis for each pair of redundant chassis. 29
Chassis Layout
•
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
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System Redundancy
Modules 1757-SRM module:
•
1 in each redundant chassis
•
Needs 2 slots
•
Needs 1757-SRC x cable [1 m (3 ft), 3 m (9 ft), 10 m (30 ft), 50 m (150 ft), and 100 m (300 ft)]
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Controllers 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.
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ControlNet Modules 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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