Description
Product Name: 1746-IB8 Allen Bradley Output module
Product details:
The Allen-Bradley 1746-IB8 is a Digital DC Input Module belonging to the legacy SLC 500 Programmable Logic Controller (PLC) system series.
- Function: It is designed to interface the PLC with 8 independent external devices (like pushbuttons, limit switches, sensors, etc.) that provide a DC voltage signal.
- Type: It is a Sinking input module, which means that current flows from the field device into the module (a “sink”). The field devices are typically wired to a common positive voltage source.
- Capacity: It features 8 discrete input channels.
2. Product Specifications (Parameters)
| Parameter | Value |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Line | SLC 500 |
| Part Number | 1746-IB8 |
| Module Type | Digital DC Input Module |
| Number of Inputs | 8 |
| Input Voltage Range | 10-30 Volts DC (Nominal 24V DC) |
| Input Type | Sinking (Current flows into the module) |
| Points per Common | 8 |
| Backplane Current (5V DC) | 50 mA (milliamperes) |
| Signal Delay (ON/OFF) | Typically 8 ms (milliseconds) |
| Off-State Leakage Current | 1 mA (maximum) |
3. Product Advantages (Advantages)
- Reliability: As part of the SLC 500 family, the 1746-IB8 is a proven, robust, and reliable industrial component suitable for harsh environments.
- High Input Density: Offers 8 inputs in a single module, providing efficient use of chassis space.
- Compatibility: Seamlessly integrates with all SLC 500 processors (e.g., SLC 5/01, 5/02, 5/03, 5/04, 5/05).
- Standard Industrial Voltage: Operates at the common industrial standard of 24V DC, making it easy to connect to standard field devices.
- Diagnostic Indicators: Includes LED status indicators for each input point, allowing for quick visual troubleshooting of field device status.
4. Important Considerations (Notes/Precautions)
- Sinking vs. Sourcing: Crucially, ensure that the field devices (sensors, switches) you connect are compatible with a Sinking input module. If the field device is a “sinking” output, it requires a “sourcing” input, and vice-versa. The 1746-IB8 is a sinking input.
- Power Requirements: Confirm that the SLC 500 power supply has enough capacity for the module’s backplane current draw ($50\text{ mA}$ at $5\text{V DC}$) in addition to all other modules.
- Series Status: The SLC 500 platform is a legacy product line. While it is highly reliable and still widely used, Allen-Bradley has since introduced the newer CompactLogix and ControlLogix platforms. Users should consider migration plans for future system upgrades.
- Wiring: Use the appropriate I/O connector or terminal block (like the 1746-N2) for secure and reliable field wiring.
5. Product Applications (Applications)
The 1746-IB8 is a general-purpose digital input module used in a wide range of industrial automation and control systems, including:
- Discrete Manufacturing: Monitoring the state of limit switches, proximity sensors, pushbuttons, and selector switches on assembly lines, conveyor systems, and machine tools.
- Process Control: Monitoring the open/closed status of valves, high/low level switches in tanks, and equipment status (e.g., pump running/stopped).
- Building Automation: Reading input from safety interlocks, door status sensors, and emergency stop buttons.
- Packaging Machinery: Detecting product presence, verifying component placement, and tracking machine cycles.
Advantages: Foxboro, OVATION, TRICONEX, Allen-Bradley, ABB, Motorola, Siemens Moore, Ge Fanuc, Woodward, Bently Nevada and other major import brands!
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Colour：new Warranty: 12 months
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