This is a short-write up on the Melsec-Q series PLC CPU, depicting differences, specifications, discontinuation and replacements, and model identification.
Some information on the migration of Melsec-Q series CPUs
table with the Program Capacity (Steps) vs Basic Operation Processing Speed (ns) vs. Communication Connection Options;
These are the Universal Melsec-Q CPU types: (QnU)
Reference and Information Resources
The following is an applicable set of information Resources: