Posted 29 Mar 2021 Dear all, I have an Allen Bradley Control panel with SLC L542C 5/04 CPU, it is used to control an RO water desalination unit, unfortunately the CPU has a fetal Fault and need to be replaced, the only available one is 1747-L542A 5/04 CPU, the problem is when downloading the PLC Program to the new CPU, using RSLogix 500, it failed due to smaller memory of A series CPU 24K while the C series CPU was 32K, is there any way to reduce the program size to be used with 1747-L542A 5/04 CPU? what is a proper way to get the new CPU run with the control program? Thank you all in advance. Share this post Link to post Share on other sites
Posted 29 Mar 2021 (edited) You could try to examine every data table for usage and attempt to reduce their size. Best of luck. Edited 30 Mar 2021 by pcmccartney1 Share this post Link to post Share on other sites
Posted 29 Mar 2021 IF you've got a spare $500.00 USD and the shipping time. Radwell International claims to have hundreds of the 32K version. https://www.radwell.com/en-US/Buy/ALLEN%20BRADLEY/ALLEN%20BRADLEY/1747-L542 Share this post Link to post Share on other sites