How to know which PLCs phased out

Hello Nguyen Phi Long;

Have a look at the basic presentation of the Siemens Spare parts service ( you can always find it by clicking on the Services link, at the top right of this page):

https://support.industry.siemens.com/cs/ww/en/sc/2110

https://support.industry.siemens.com/cs/ww/en/sc/2112

Once the product is nearing discontinuation phase, you can always order it directly from Spare parts; the cost goes up once the product is cancelled, so I suggest that you use this only as an emergency solution.

Once a product is cancelled, you should choose a successor product (if available) or start planning to use an alternative: for example, if your plant was working with Simovert Masterfdrives, start looking at Sinamics drives  to replace them.

Possibly this document could be informative:

Convert- Simovert Masterdrives

Hope this helps,

Daniel Chartier