Allen-Bradley micrologix 1500

Publication 1764-UM001B-EN-P - April 2002
Table of Contents ix
Appendix D
Upgrading Your Operating System
Preparing for Upgrade. . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
Performing the Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
Missing/Corrupt OS LED Pattern . . . . . . . . . . . . . . . . . . . . D-2
Appendix E
Understanding Communication
Protocols
RS-232 Communication Interface . . . . . . . . . . . . . . . . . . . . E-1
DF1 Full-Duplex Protocol . . . . . . . . . . . . . . . . . . . . . . . . . E-1
DF1 Half-Duplex Protocol . . . . . . . . . . . . . . . . . . . . . . . . . E-2
DF1 Half-Duplex Operation . . . . . . . . . . . . . . . . . . . . . E-2
Considerations When Communicating as a DF1 Slave
on a Multi-drop Link . . . . . . . . . . . . . . . . . . . . . . . . . . E-3
Using Modems with MicroLogix 1500
Programmable Controllers . . . . . . . . . . . . . . . . . . . . . . . . . E-3
Dial-Up Phone Modems . . . . . . . . . . . . . . . . . . . . . . . . E-4
Leased-Line Modems . . . . . . . . . . . . . . . . . . . . . . . . . . E-4
Radio Modems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5
Line Drivers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5
DH-485 Communication Protocol. . . . . . . . . . . . . . . . . . . . E-5
DH-485 Network Description . . . . . . . . . . . . . . . . . . . . E-5
DH-485 Token Rotation . . . . . . . . . . . . . . . . . . . . . . . . E-6
DH-485 Configuration Parameters. . . . . . . . . . . . . . . . . E-6
Devices that Use the DH-485 Network . . . . . . . . . . . . . E-7
Important DH-485 Network Planning Considerations. . . E-8
Modbus RTU Slave Communication Protocol
(MicroLogix 1764-LSP and 1764-LRP Series B and
later processors only) . . . . . . . . . . . . . . . . . . . . . . . . . . . E-13
ASCII Protocol (MicroLogix 1500 1764-LSP
and 1764-LRP Series B and later Processors only) . . . . . . . E-13
Appendix F
System Loading and Heat
Dissipation
System Loading Limitations . . . . . . . . . . . . . . . . . . . . . . . . F-1
System Expansion Calculations . . . . . . . . . . . . . . . . . . . . . F-1
Selecting System Devices . . . . . . . . . . . . . . . . . . . . . . . F-2
Verifying the System Loading . . . . . . . . . . . . . . . . . . . . F-4
Calculating Heat Dissipation . . . . . . . . . . . . . . . . . . . . . . . F-9
Glossary
Index