Product Overview
This input module acquires digital signals from field devices for Reliance Electric control systems. Manufacturing facilities require reliable input interfaces to monitor equipment status and process conditions. The 45C44 provides sixteen optically isolated digital inputs for versatile field connectivity. Its modular design fits seamlessly into standard Reliance I/O racks. Instrument technicians can replace this unit without disturbing adjacent module wiring. The module’s built-in filtering rejects noise from contact bounce and electrical interference.
Technical Specifications
| Parameter | Specification |
|---|---|
| Number of Inputs | 16 digital inputs (optically isolated) |
| Input Voltage Range | 24 VDC ±20% (nominal) |
| Input Threshold (ON) | ≥15 VDC |
| Input Threshold (OFF) | ≤5 VDC |
| Input Current | ≤8 mA per channel at 24 VDC |
| Input Impedance | 3 kΩ (typical) |
| Isolation Voltage | 1500 VAC (inputs to logic) |
| Response Time | ≤3 ms (filtered) |
| Filter Time Constant | 2 ms (software-selectable) |
| Input Protection | Reverse polarity and transient suppression |
| Status Indication | Green LED per channel (input active) |
| Power Supply | 24 VDC ±15% (from backplane) |
| Power Consumption | ≤3.5 W |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | –40°C to +85°C |
| Dimensions (W x H x D) | 50 mm x 120 mm x 130 mm |
| Weight | 0.40 kg |
| Mounting Type | Rack-mount with guide rails |
| Termination | Removable screw terminal blocks |
| Wiring Compatibility | 0.5 mm² to 2.5 mm² (solid/stranded) |
Input Signal Acquisition
The 45C44 monitors each input channel for voltage levels above the 15-volt threshold. An internal comparator converts the analog input into a clean digital logic signal. Optical couplers provide complete electrical isolation between field wiring and system logic. The module’s 3-kΩ input impedance loads field devices minimally. Each channel includes a green LED that illuminates when the input remains active.
Noise Rejection and Signal Filtering
Built-in debounce circuits eliminate false triggers from mechanical switch contact bounce. A software-selectable 2-millisecond filter removes high-frequency electrical noise. The module rejects common-mode noise through its isolated input architecture. Input transient suppression clamps voltage spikes from long cable runs. The unit’s response time of 3 milliseconds suits most industrial monitoring applications.
Diagnostics and Status Reporting
Individual LED indicators show the real-time state of all sixteen input channels. A global module status LED confirms proper power supply and communication. The module reports open-wire conditions for supervision of critical circuits. Diagnostic information passes through the system backplane for remote monitoring. Users can access input status via the controller’s programming software.
Power Consumption and Thermal Design
The module draws a maximum of 3.5 watts from the 24-volt backplane supply. Low power dissipation minimizes internal temperature rise during operation. Natural convection cooling suffices without requiring forced airflow. The unit’s compact form factor permits dense packing within I/O racks. Thermal stability ensures consistent input threshold levels across temperature variations.
Mechanical Construction and Installation
The 50-millimeter wide housing fits standard Reliance Electric rack systems. Guide rails ensure proper alignment with the backplane connector during insertion. Weighing 400 grams, the module inserts and extracts with minimal effort. Removable terminal blocks allow wiring changes without removing the entire module. Front-panel labeling clearly identifies channel numbers and wiring terminals.
Details
| Weight | 0.40 kg |
|---|---|
| Dimensions | 50 × 120 × 130 mm |
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