139 Publication 1763-UM001E-EN-P - June 2015
Chapter
6
Using Real-Time Clock and Memory Modules
The MicroLogix 1100 controller has a built-in real-time clock (RTC). You can
order a memory module as an accessory.
One type of memory module is available for use with the MicroLogix 1100
controller.
Real-Time Clock Operation
Operation at Power-up and Entering a Run or
Test Mode
At power-up and when the controller enters a run or test mode, the values
(date, time and status) of the RTC are written to the RTC Function File in the
controller.
The following table indicates the accuracy of the RTC for various
temperatures.
For more information on “Real-Time Clock Function
File” and “Memory Module Information File”, refer to
the MicroLogix 1100 Programmable Controllers
Instruction Set Reference Manual, publication
1763-RM001.
Catalog Number Function Memory Size
1763-MM1 Memory Module 128 KB
RTC Accuracy
Ambient Temperature
Accuracy
(1)
(1)
These numbers are maximum worst case values over a 31-day month.
0 °C (32 °F) -13...-121 seconds/month
25 °C (77 °F) 54...-5 seconds/month
40 °C (104 °F) 29...-78 seconds/month
55 °C (131 °F) -43...-150 seconds/month
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