The Allen Bradley Logix5000 family (ControlLogix, CompactLogix, FlexLogix, SoftLogix) has some very good manuals. If you are just starting out or need a refresher here are the key manuals and the order I would read them. If you have RSLogix 50000 installed then you will find some of these in the Help > Online Books menu. Revision 16 also has some great videos in the Learning Center.
The Basics
For starters there is the Quick Start manual.
Logix5000 Controllers Quick Start
If you don't deal with the PLCs or RSLogix 5000 too much and just need a quick reminder about the hardware or programming then the System Reference is perfect.
Logix5000 Controllers System Reference
The Essentials
If you are getting into programming and designing a system then you'll want to start off with the Common Procedure Manual. It has a lot of helpful examples dealing with all aspects of the system.
Logix5000 Controllers Common Procedures Programming Manual
Next comes the nitty gritty of each instruction. It's a good idea to at least peruse all the instructions so you have an idea of what is available.
Logix5000 Controllers General Instructions Reference Manual
Logix5000 Process Control and Drives Instructions Reference Manual
Logix5000 Controllers Motion Instructions
GuardLogix Safety Application Instruction Set Reference Manual
An often overlooked manual but filled with great information for getting the most out your designs is the Design Considerations Reference Manual. Certainly a must read if you are knee deep in the development and programming of Allen Bradley PLCs.
Logix5000 Controllers Design Considerations Reference Manual
Hardware Specifics
Specifics for the hardware can be found in the User Manuals and Installation Instructions for the PLC.
ControlLogix
ControlLogix System User Manual
ControlLogix Installation Instructions
ControlLogix Controller and Memory Board Installation Instructions
CompactLogix
CompactLogix System User Manual
CompactLogix 1769-L20, 1769-L30 Installation Instructions
CompactLogix 1769-L32E, 1769-L35E Installation Instructions
CompactLogix 1769-L32C, 1769-L35CR Installation Instructions
FlexLogix
FlexLogix System User Manual
FlexLogix Controllers Installation Instructions
SoftLogix
SoftLogix System User Manual
SoftLogix Controllers Installation Instructions
GuardLogix
GuardLogix Controllers User Manual
GuardLogix Controllers Installation Instructions
Networking
If you are deciding on which network to use then see the Design Considerations manual and the section "Determine the Appropriate Network". Otherwise, for existing networks the following are helpful.
Ethernet/IP
Ethernet Design Considerations for Control System Networks
EtherNet/IP Modules in Logix5000 Control Systems User Manual
Guard I/O EtherNet/IP Safety Modules User Manual
ControlNet
ControlNet Modules in Logix5000 Control Systems
DeviceNet
DeviceNet Modules in Logix5000 Control Systems User Manual
Guard I/O DeviceNet Safety Modules
The links are from the AB site so they are the latest and greatest manuals. Let me know if any of them are broken or if I forgot one you think is essential.
