Siemens Simatic S7-400

Back-up battery (option) 1 x lithium AA, 3.6 V/2.3 Ah
Protective separation in accord‐
ance with IEC 61131-2
Yes
Power supply modules
3.6 Power supply module PS 407 4A (6ES7407-0DA01-0AA0)
S7-400 Automation System Module Data
56 Reference Manual, Ausgabe 11/2016, A5E00850736-08