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Designed for the Simatic TI 305 platform, Siemens 305-25N is an Input Module.
Within the process-control arrangement, a digital input module receives discrete on/off states from field contacts and devices, then makes those states available to the controller for monitoring, sequencing, alarms, and interlocks. Ratings and capacity should be verified against the exact model documentation.
Simatic TI 305 provides the platform context for this product, while the PLC modules classification identifies its broader automation role. Exact application should follow the installed system configuration. Final selection should be based on the plant's controlled-equipment records.
For maintenance or replacement work, the exact module designation should be checked against the installed hardware, wiring records, and control-system documentation before the component is placed into service. The product should be matched to the documented control-system position.
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