The 45C272 is a digital output module designed for Reliance AutoMate 20 series PLC systems. It converts digital commands from the main CPU into on-site switching signals to drive actuators such as solenoid valves, contactors and indicator lights. This product has been discontinued, 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. 272: Designates a dedicated digital output module for AutoMate 20 platforms. There is no revision letter, which means it is the original standard hardware version.

Output Channels: 16 isolated digital output channels. Output Type: 24 VDC transistor output. Rated Current: Maximum 0.5 A per channel. Isolation: 2500 Vrms isolation between channels and the backplane. Power Supply: 5 VDC supplied from the system backplane. Operating Temperature: 0°C to 55°C; humidity 20%–90% non-condensing. Mounting: DIN-rail or panel mount compatible with AutoMate 20 series backplane. Weight: Approximately 0.8 kg with a rugged metal enclosure.

Field Output Terminals: Removable terminal block for connecting on-site actuators. Backplane Interface: Proprietary edge connector for power supply and data exchange with the host CPU. Status LEDs: PWR for power status, RUN for module operating status, and independent LED for each channel to indicate output state. No extra configuration switches are required for normal operation.

It receives digital control signals from the PLC CPU and drives on-site switching devices synchronously. The isolation design prevents voltage surges and electromagnetic interference from damaging the main control system. All channels work independently, so a fault on one channel will not affect others. It features fast signal response to meet the requirements of high-frequency switching control. It works with the CPU and other modules to realize automatic logic control of production equipment.

It serves as a replacement for faulty digital output modules in existing AutoMate 20 legacy systems. It is widely used in mechanical processing, packaging machinery and material handling lines to drive contactors, solenoid valves and indicator lights. It applies to industrial sites like water treatment and light industry manufacturing that require large quantities of switching control. It is also suitable for equipment renovation projects to expand digital output points.

Install the module firmly into the backplane slot with power disconnected, then wire the field devices. Check all connections to avoid short circuits before powering on. Observe LED indicators to monitor channel status during operation. Conduct quarterly routine inspections to clean dust and tighten wiring terminals. Cut off all power and wait for complete discharge before disassembly or maintenance to prevent electric shock. Use this module only with compatible AutoMate 20 series accessories.