The MicroLogix 1200's base I/O can be expanded using 1762 I/O modules. In this article we'll describe the details of how this is accomplished.
The right front of the MicroLogix 1200 has a small cover over top of a 1762 I/0 expansion port, and the first step in adding 1762 I/O to a MicroLogix 1200 is to power down the unit, and remove the cover.
Next, you'll find that your 1762 expansion I/O modules come with a ribbon cable and connector on the left side. Also on the front right of the expansion module you'll find another small cover over the top of an additional expansion I/O port.
To install your 1762 expansion module, simply plug the ribbon cable connector into the MicroLogix 1200's expansion I/O connector and replace the cover. Then, to connect additional 1762 expansion I/O modules, remove the expansion cover from the first module and plug the second module into it, replacing the cover when done.
Because of the wide variety of expansion modules, each requires a different amount of power from the MicroLogix 1200. Due to this fact, the actual number of supported expansion modules on a MicroLogix 1200 is anywhere between 3 and 6 modules.
To aid in the process of calculating exactly how many modules can be added, Rockwell has developed an easy to use spreadsheet to help qualify MicroLogix 1200 expansion I/O systems. This spreadsheet can be downloaded from Rockwell's website using the below link:
Well, that's it for today's article about MicroLogix 1200 expansion I/O. For more information on the installation of MicroLogix 1200 expansion I/O, see the manufacturer's installation instructions HERE.
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