SIEMENS 6ES7131-4BF00-0AA0 Input Module, ELEKTRON, ET200S, Digital, 8POINT, 24VDC, 15MM Width, 1 Unit PER Package: Amazon.com: Industrial & Scientific
Siemens 6Es7 193-6Bp20-0Da0, Simatic Et 200Sp, Base Unit 6Es7 193-6Bp20-0Da0: Amazon.com: Industrial & Scientific
SIEMENS 6ES7138-4CB00-0AB0 Module, AC Power for GM ET200S APPL'S: Amazon.com: Industrial & Scientific
Automating with SIMATIC: Hardware and Software, Configuration and Programming, Data Communication, Operator Control and Monitoring: Berger, Hans: 9783895784590: Amazon.com: Books