The Siemens 6ES series is a SIMATIC PC memory expansion memory module. It has 4 Gbyte capacity. It is capable of reading and writing data into the memory 10^6 times per second.
Memory size 4 GByte Type of memory DDR3 1066 SODIMM RAM Suitable for SIMATIC IPC227E/427D, SIMATIC HMI IPC227E/477D, SIMATIC Field PG M4