HereĀ are some of the useful and recommended books you can find on AmazonĀ :

STEP 7 in 7 Steps
A Complete Guide to Implementing S7-300/S7-400 Programmable Logic Controllers
HereĀ are some of the useful and recommended books you can find on AmazonĀ :

STEP 7 in 7 Steps
A Complete Guide to Implementing S7-300/S7-400 Programmable Logic Controllers