Using an expansion I/O power supply increases the system’s capacity for adding expansion I/O modules, such as the 1769-IF4 and 1769-OF2 analog modules. You can visit the Micrologix web site to get an electronic worksheet to assist you with system expansion validation using 1769 power supplies and Bus communication cables. Enter MicroLogix 1500; go to Tools and Tips, Expansion I/O System Qualifier.
Expansion Power Supplies and Cables Using an expansion I/O power supply increases the system’s capacity for adding expansion I/O modules, such as the 1769-IF4 and 1769-OF2 analog modules. You can visit the MicroLogix web site to get an electronic worksheet to assist you with system expansion validation using 1769 power supplies and Bus communication cables. Enter MicroLogix 1500; go to Tools and Tips, Expansion I/O System Qualifier. You can now connect an additional bank of I/O to your controller with MicroLogix 1500 Operating System Revision Number (FRN) 3 or later.
A maximum of one 1769 Expansion cable can be used in a MicroLogix 1500 system, allowing for two banks of I/O modules (one connected directly to the controller, and the other connected via the cable). Each I/O bank(1) requires its own power supply (Bank 0 uses the controller’s embedded power supply).
Only one power supply (embedded or expansion) may be used on an I/O bank. The expansion power supply cannot be directly connected to a controller that has an embedded power supply, such as the MicroLogix 1500. It must be connected using one of the expansion cables.
Checking the MicroLogix 1500 Firmware
You need to verify if using the MicroLogix 1500 controller with a 1769 Expansion I/O power supply, the following:
• MicroLogix 1500 Processor (Catalog Number 1764-LSP, Series A, Revision C or higher)
• Operating System Version: Firmware Revision Number (FRN) 3 or higher
You can check the FRN by looking at word S:59 (Operating System FRN) in the status file.
If your processor is at an older revision, you must upgrade the operating system to FRN 3 or higher to use an expansion cable and power supply.
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Allen Bradley PLC
Allen Bradley PLC