Simple Steps to Connect a SIMATIC S7-200 to a SIMATIC S7-300/400 via Ethernet » Patti Engineering
Siemens 6ES7288-1ST60-0AA0, SIMATIC S7-200 SMART, CPU ST60, CPU, DC/DC/DC, onboard I/O: 36 DI 24 V DC; 24 DO 24 V DC; Power supply: DC 20.4-28.8V DC, Program/data memory 50 KB : Amazon.in: