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Siemens designates 6ES7123-1FB00-0AB0 as an Analog Input Module associated with the Simatic S7 control platform.
In day-to-day system operation, 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. This helps preserve the function assigned to the installed control node.
SIMATIC S7 integrates programmable control, modular I/O, and industrial communication functions. This product belongs to the PLC modules layer of the installed S7 automation solution. This is relevant where the installation calls for this specific component class.
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 plant's maintenance records should support final product selection.
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