Siemens SIMATIC S7-400, CPU 412-2 PN Central processing unit, 6ES7412-2EK06-0AB0 | eBay
Automating with SIMATIC S7-400 inside TIA Portal: Configuring, Programming and Testing with STEP 7 Professional: Berger, Hans: 9783895783838: Amazon.com: Books
Rugged process controller - SIMATIC S7-400 - Siemens Automation and Engineering
Compatible with Siemens PLC Programming Cable S7-200/300/400 Data Download Line 6ES7972-0CB20-0XA0,USB/MPI PC Adapter USB Cable for Siemen S7-200/300/ 400 PLC MPI/DP/PPI Programming Cable
SIEMENS Simatic S7 400 System Features | BD Engineering Solution
Siemens Control Unit 6ES7 414-2XG03-0AB0 CPU 414-2 Simatic S7-400 Version 04 4025515128731 | eBay