What this part is and what it does
The Siemens 6ES7458-1XX00-6YB4 is a SIMATIC S7-400 Special Offer Pack containing the FM 458-1 DP function module. This is a high-speed, freely programmable processing module for closed-loop control and fast logic tasks within the S7-400 rack. The DP designation indicates it includes a PROFIBUS DP interface for direct communication with distributed I/O.
Lifecycle and sourcing reality
This part carries a lifecycle stage of mature. For a Siemens S7-400 component, that typically means it is no longer the primary focus for new designs but remains available through the service and spares channel. The S7-400 platform itself has been in a long phase-out transition, so this FM 458-1 DP pack is best treated as a critical spare for existing lines rather than a candidate for new builds. Sourcing is through the RFQ channel — we quote to order against your BOM line.
Where it fits in the system
The FM 458-1 DP occupies a slot in the S7-400 rack, typically alongside a CPU 41x-xxx. The module handles closed-loop control tasks that would otherwise burden the CPU — think fast PID loops, cam controllers, or high-speed logic sequences on a packaging or machine-tool line. The PROFIBUS DP interface connects to remote I/O stations, drives, or valve manifolds, keeping the control loop deterministic.