Siemens 6ES7 138-4FR00-0AA0 is a SIMATIC ET 200S power module that supplies the 24V DC backplane power for the ET 200S distributed I/O system. Siemens’ certification material describes this variant as a 24V DC power module with a power/monitor switch (P/M) and a 5A capability for the connected electronics. In automation panels and control cabinets, this module provides reliable, centralized 24V power to ET 200S modules and attached field devices, enabling stable operation of the distributed I/O network.
