Overview
The Allen-Bradley 1794-IB16 Series A is a compact 16-point digital sink input module engineered for the FLEX I/O distributed I/O family. Designed to accept sinking current inputs from PNP-type sensors and discrete devices, this module supports the 10–31.2VDC input voltage range and includes SIL2 functional safety certification. The 1794-TB32 Series A terminal base provides secure screw-terminal connectivity for field wiring, making installation and maintenance straightforward in industrial control systems.
Key Features
- 16 Sinking Current Inputs: Accepts inputs from PNP sensors; each input rated for 8 mA nominal, 12 mA maximum.
- 10–31.2VDC Operating Range: Robust voltage tolerance accommodates power supply variations without module replacement.
- SIL2 Functional Safety Rating: Certified for safety-critical applications per IEC 61508 and industry standards.
- 4.6 kΩ Input Impedance: Optimal signal integrity with low-impedance sensing circuits.
- 50V Isolation (Basic Insulation): Ensures signal isolation and noise immunity in multi-source control environments.
- IP20 Enclosure Rating: Protected against finger contact and solid objects; suitable for panel and DIN-rail mounting.
Technical Specifications
| Specification | Value |
|---|---|
| Input Count | 16 points |
| Input Type | Digital Sink (current-sinking) |
| Nominal Input Voltage | 24VDC |
| Input Voltage Range | 10–31.2VDC |
| Nominal On-State Current | 8 mA |
| Maximum On-State Current | 12 mA |
| Minimum On-State Voltage | 10VDC |
| Maximum Off-State Voltage | 5VDC |
| Maximum Off-State Current | 1.5 mA |
| Input Impedance | 4.6 kΩ |
| Continuous Isolation Voltage | 50V (Basic Insulation) |
| Mounting Style | DIN-Rail / Panel |
| Terminal Base | 1794-TB32 Series A (screw terminal) |
| Enclosure Rating | IP20 |
| Operating Temperature | 32–131°F (0–55°C) |
| Weight | 0.20 lbs |
| Certifications | UL, CSA, CE, CUL, GOST, KC, RCM (ATEX available) |
Typical Applications
- Discrete material handling and conveyor control systems.
- Assembly line sensor monitoring and alarm detection.
- Safety-critical applications requiring SIL2 rated I/O (machine guarding, e-stop logic).
- Distributed control in water treatment, food processing, and packaging machinery.
- Tank level sensing, pressure switch monitoring, and digital status feedback.
- Integration with Allen-Bradley CompactLogix, MicroLogix, or ControlLogix via Flex I/O adapter modules.
Compatibility & Replacements
The 1794-IB16 operates within Rockwell Automation’s Flex I/O ecosystem and is compatible with all standard Flex I/O communication adapters (EtherNet/IP, ControlNet, DeviceNet). Up to eight (8) input modules can be installed in a single Flex I/O rack. The module integrates with RSLogix 500, RSLogix 5000, and Studio 5000 programming environments via configured communication bridges.
Common Alternatives & Related Parts:
- 1794-IB8: 8-point input variant for lower-density applications.
- 1794-IB32: 32-point input module for expanded channel count.
- 1794-OB16: Complementary 16-point output module (relay or open-collector options).
- 1794-TB3 / 1794-TB3S: Compact terminal bases (screw or spring-clamp variants).
- 1794-TB32: Extended terminal base with greater spacing; Series A variant specified for this module.
- Equivalent (legacy): Allen-Bradley 96145678 (reverse-compatible pinout).
For OEM retrofits or field replacements, verify communication adapter compatibility with your control platform before ordering.
