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Siemens 6ES7431-1KF20-0AB0 is an Analog Input Module for the Simatic S7 product family.
From a maintenance perspective, this class of module brings discrete field status into the control system. Typical signal sources include switches, relay contacts, permissives, and equipment-status circuits when they match the module's electrical requirements. Its role should remain distinct from that of similarly named assemblies.
Within an S7 installation, the exact hardware order number determines supported interfaces and configuration behavior. System and software compatibility should be checked before replacement. Application details remain governed by the exact product revision.
Country of origin is listed as Germany.
When this product is used for lifecycle support, technicians should confirm the installed revision, connection arrangement, and system assignment rather than assuming interchangeability with a similarly named module. The system's documented hardware assignment should guide placement.
Product phaseout annouced by Siemens 10.01.2025
SIEMENS SIMATIC S7-400 analog input SM 431, isolated 8 AI, resolution 14 bit, U/IResistor 8 AI, cycle time 0.416 ms
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