It also presumably adds the need to flash the processor to firmware release v23 as well. The reason seems to be to allow side by support installation support of 21 and 23, something that wouldn’t be possible if the update was released as 21.04. With the version 21.00 versus 21.03 (and 20.01 versus 20.03) minor revision incompatibility still fresh in our minds (see this post and this post for more details,) and with the need to rev v21.03 to address additional concerns, Rockwell has decided to release the updated version of 21 as version 23.
So what’s the reason? It appears to be the need to add additional “robustness” to V21, however that answer seems a little lacking in the details. That’s right, Studio 5000 version 22 will not be released to the public. Instead, it will remain an internal build. For only the second time in the product’s history over a decade, Rockwell will not be releasing a major version of Logix programming software.
