وصف
Description
The Allen-Bradley 1746-NI16I is a high-density analog input module designed for the SLC 500 programmable logic controller (PLC) system. This module provides 16 single-ended, backplane-isolated input channels with 16-bit resolution, making it suitable for high-precision monitoring of current-based process signals. It is engineered to support a variety of current ranges, including 0 to 20 mA, 4 to 20 mA, and +/- 20 mA, facilitating integration into diverse industrial control environments.
Features
- 16-channel analog current input module for SLC 500 systems.
- 16-bit resolution for high-accuracy signal conversion.
- Supports multiple input signal types: 0-20 mA, 4-20 mA, +/- 20 mA, and 0-1 mA.
- Integrated open-circuit detection for rapid identification of sensor or wiring faults.
- Individual channel-to-channel isolation for enhanced noise immunity and signal integrity.
- Compact single-slot module design for efficient chassis space utilization.
- 25-pin D-shell connector interface for reliable field wiring.
Applications
- Oilfield water injection automation systems (pressure monitoring).
- Wastewater treatment plants (aeration tank DO and pH monitoring).
- Power station auxiliary control (transformer and bearing temperature monitoring).
- Hydraulic system monitoring for large-scale presses and rolling machines.
Technical Specifications
| Model |
1746-NI16I |
| Input Channels |
16 |
| Resolution |
16-bit |
| Input Signal Types |
0-20 mA, 4-20 mA, +/- 20 mA, 0-1 mA |
| Backplane Current (5V DC) |
125 mA |
| Backplane Current (24V DC) |
75 mA |
| Thermal Dissipation |
2.43 Watts |
| Input Impedance |
249 Ohms |
| Operating Temperature |
-25 to 60 degC (-13 to 140 degF) |
| Relative Humidity |
5% to 95% (non-condensing) |
| Connector Type |
25-pin D-shell |
Installation Guidelines
- Ensure the PLC chassis is powered down before inserting or removing the module to prevent electrical damage.
- The module is designed for standard SLC 500 chassis mounting; ensure it is fully seated and the retaining screws are tightened.
- Use shielded twisted-pair cabling for analog signals to minimize EMI/RFI interference.
- Maintain proper grounding practices for the analog common terminal to ensure signal stability.
- Keep the module clear of high-voltage power lines and high-EMI sources within the control cabinet.
- If removing the terminal block, use the provided labeling to ensure correct re-wiring of input channels.
FAQs
What is the 1746-NI16I?
The Allen-Bradley 1746-NI16I is a 16-channel, high-resolution analog current input module designed for the SLC 500 platform.
How do I configure the 1746-NI16I module?
Configuration is performed in RSLogix 500 (offline or online) via the I/O configuration screen. It is a multi-class module, with Class 3 recommended for optimal performance.
What are the 1746-NI16I power requirements?
The module draws 125 mA at 5V DC and 75 mA at 24V DC from the SLC 500 backplane.
How can I detect a sensor disconnection?
The 1746-NI16I features built-in open-circuit detection, which allows the controller to report a fault condition if a sensor loop is broken.
