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2556 is identified by Siemens as a CTI Thermocouple Input Module within the Simatic TI Other family.
For replacement planning, digital input hardware creates the path from field-level status signals to control logic, allowing the system to evaluate operating conditions and respond through configured sequences or protective actions. The original equipment schedule should guide compatibility review.
For system maintenance, this product is associated with the Simatic TI Other family and the PLC modules category. Configuration and compatibility should be confirmed for the exact system in which it will be used. Selection should account for the intended surrounding hardware configuration.
In the signal path, this approach helps preserve the intended system function while keeping selection aligned with the documented ratings, capacity, and compatibility requirements. Configuration records should be reconciled with the exact installed assembly.
Control Technology Inc. version of the Siemens TI 505-2556. Please see the 505-2556.
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