What it is and what it fits
The Siemens 6ES7408-1TX00-6XA0 is a spare-part monitoring printed circuit board for the fan subassembly used in the SIMATIC S7-400 rack system. It is specifically designed as a replacement or spare for the fan units in the 6ES7 408-1TA00-0XA0 and 6ES7 408-1TB00-0XA0 power supply / fan modules.
Lifecycle and sourcing reality
This part carries a lifecycle stage of mature, meaning it is no longer in active new-product introduction but remains available through the supply channel for ongoing maintenance and repair of existing S7-400 installations. For a contract-manufacturing buyer, this part is on the customer's AVL as a genuine Siemens spare; no substitution should be made without a written deviation. Sourcing is quoted to order against an RFQ.
Deployment context
This PCB mounts inside the S7-400 rack as part of the fan subassembly, monitoring fan operation and reporting status back to the CPU. It is not a standalone field device — it is a rack-level component that should be handled with standard ESD precautions during replacement. The fan subassembly it serves is a forced-air cooling unit for the rack's backplane and power supply section.