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Allen Bradley 1771 series 16-point DC input module for receiving discrete field contact and sensor status signals.
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The Allen Bradley 1771-IBD Series B is a 16-point digital DC input module for 1771 I/O chassis used in PLC-5 and related legacy control systems.
It is designed to capture discrete field states from devices such as switches, auxiliary contacts, and sensor outputs, then map those signals into PLC logic for control decisions.
The module is commonly retained in long-life industrial systems where dependable discrete input acquisition is required without full platform replacement.
Used in established process and manufacturing lines where 1771 racks still collect machine and process status inputs for central PLC control.
Confirm slot assignment, wiring interface, field-voltage class, and chassis compatibility with existing 1771 system documentation before purchase.
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