SIMATIC S7-400 ¨C Siemens PLC-The Power Controller for system solutions in the manufacturing and process industries Within the Controller family, the SIMATIC S7-400 is designed for system solutions in the manufacturing and process automation.The product range comprises 9 Standard CPUs, 2 failsafe and 2 high available CPUs.All the siemens parts we sold, 100% brand new! Coming with original packing!