Spectrum Controls 8000-RDI-332 Digital Input Module

The Spectrum Controls 8000-RDI-332 digital input module is a 32-channel input block for Spectrum Controls 8000 I/O racks, designed to monitor discrete field signals from 12–24 V AC/DC inputs. Each channel accepts 12–24 V field signals, enabling direct connection to common sensors and switches. The module is powered from a 120 VAC supply (up to 500 mA) and uses a 5 VDC supply for its internal logic. Dimensions are 1.5 in W × 6.5 in L × 1.0 in H (3.8 cm × 16.5 cm × 2.5 cm), and it weighs 2 lb 9.6 oz (1.2 kg). The 8000-RDI-332 is listed as discontinued by the manufacturer, but used and refurbished units remain available from distributors. This 32-channel digital input module is commonly used to expand input capacity for legacy control configurations or to retrofit older SY/MAX I/O installations to Spectrum Controls systems, enabling straightforward binary input monitoring for a wide range of industrial sensors and switch signals.