Backup battery
SIMATIC S7 Backup battery (LI) 3.6 V/min. 0.85 Ah for S7-300 CPUs and S5-90U
Memory card
The Siemens SIMATIC S7 series RAM memory card for S7-400. The memory size is 256kbyte. Type of memory Flash-EPROM Memory size 256 Kbyte Weight 51 g
AddFEM Sequence of Event ADDFEM (front end module) PROFIBUS device with high-speed I/O functions, redundant, FEF (front end function) Supply Voltage:24 V DC (±15%) Power Consumption:≤ 5 W (typical) PROFIBUS Interface:2 ports (RS-485)