The 45C-271 is a digital input module dedicated to Reliance AutoMate 20 series PLC systems. It collects on-site digital switch signals and converts them into digital data recognizable by the main CPU. This module is no longer in production, and only refurbished, surplus or NOS units are available for maintenance and replacement of legacy industrial automation systems.

45C: Unified prefix for Reliance AutoMate 45C series control and I/O components. 271: Represents a dedicated digital input module for AutoMate 20 platforms. The hyphen is a common notation for industrial part numbers, and this model has no additional hardware revision letters.

Input Channels: 16 isolated digital input channels. Input Signal Type: DC 24V standard industrial signal. Input Current: Rated 10mA per channel. Isolation: 2500 Vrms isolation between channels and backplane. Power Supply: 5 VDC powered by the system backplane. Operating Temperature: 0°C to 55°C; humidity 20%–90% non-condensing. Mounting: DIN-rail or panel mount matching AutoMate 20 series backplane. Weight: Approximately 0.8 kg with sturdy metal enclosure.

Field Input Terminals: Removable terminal block for connecting sensors, limit switches and other field devices. Backplane Interface: Proprietary edge connector for power supply and data transmission with the host CPU. Status LEDs: PWR for power indication, RUN for module operating status, and separate LED for each channel to show signal presence. No extra configuration switches are required for regular use.

It acquires real-time on-site digital switching signals and transmits valid data to the PLC CPU for logic judgment. The built-in isolation structure prevents surge voltage and signal interference from damaging the control system. Each channel works independently to ensure normal operation of other channels when a single channel fails. It features fast signal response to adapt to high-frequency switching scenarios. It works cooperatively with CPU and other modules to complete automatic logic control of production equipment.

It is used to replace faulty digital input modules in existing AutoMate 20 legacy systems. It is widely applied in manufacturing production lines, packaging machinery and material handling equipment for collecting switch and sensor signals. It fits industrial sites such as water treatment and mechanical processing that require a large number of digital signal acquisition. It is also applicable to equipment upgrading projects to expand digital input points.

Install the module into the designated backplane slot firmly under power-off state, and connect field devices to the terminal block. Check all wiring to avoid short circuit before powering on the system. Observe LED indicators to confirm each channel works normally during operation. Conduct quarterly inspections to remove dust and check wiring tightness. Cut off all power and wait for full discharge before disassembly or maintenance to avoid electric shock. Use this module only with compatible AutoMate 20 series accessories.