Product Overview
The Allen-Bradley 1734-IJ is a compact incremental encoder module designed for the POINT I/O family. It provides a single counter channel capable of reading encoder signals at frequencies up to 1 MHz, 500 kHz, or 250 kHz, depending on configuration. With a nominal input voltage of 5 VDC and continuous isolation of 50 Volts, this module delivers reliable performance in industrial environments.
Part of the Rockwell Automation POINT I/O series, the 1734-IJ is engineered to integrate seamlessly with existing control systems. Its small footprint (2.21 x 0.47 x 2.97 inches) and lightweight design (0.08 pounds) make it easy to mount on DIN rails or panels, saving valuable cabinet space.
Technical Specifications
Below are the key specifications for the Allen-Bradley 1734-IJ, sourced directly from the manufacturer's data:
| Specification |
Value |
| Series |
POINT I/O |
| Module Type |
Incremental Encoder Module |
| Counter |
1 |
| Input Frequency |
1 MHz, 500 kHz, or 250 kHz |
| Voltage Rating |
5 VDC |
| Voltage Type |
A return, B return, Z return |
| Isolation Voltage |
50 Volts Continuous |
| Power Dissipation |
1.1 Watts |
| Thermal Dissipation |
3.75 BTU/hour |
| Keyswitch Position |
2 |
Additional electrical characteristics include an input current of 19.1 mA at 5 VDC and 25.7 mA at 6 VDC. The maximum off-state current is 0.250 mA, and the off-state voltage is ≤1.25 VDC. For on-state, the voltage range is ±6 V, with current ≥5 mA and voltage ≥2.6 VDC.
Industry Applications
The Allen-Bradley 1734-IJ is ideal for applications requiring precise speed, position, or direction monitoring. Typical uses include:
- Conveyor systems – tracking product movement and speed.
- Packaging machinery – synchronizing cutting or sealing operations.
- Material handling – monitoring motor shaft rotation for positioning.
With its high input frequency capability, the 1734-IJ handles fast-moving machinery with accuracy. The module's 24-bit binary frequency range (0 to 16,777,215) expressed as a 32-bit long word enables fine resolution for demanding control loops.
Installation & Setup
Mount the 1734-IJ on a DIN rail or panel using 22 to 14 AWG solid or stranded copper wire. The module is compatible with 1734-TB, 1734-TBS, 1734-TB3, or 1734-TB3S wiring bases. No additional external DC power supply is required, simplifying installation.
Five status indicators (one red/green for module status, one red/green for network status, and three yellow for A, B, and Z inputs) provide real-time diagnostics. The yellow indicators flash when inputs toggle, a unique feature that aids in troubleshooting.
Maintenance & Reliability
Designed for continuous operation, the 1734-IJ operates within a temperature range of -4 to 131°F and withstands non-operating temperatures from -40 to 185°F. It handles 30 g operating shock and 5 g vibration at 10 to 500 Hz, ensuring durability in harsh environments.
With a maximum POINTbus current draw of 160 mA and power dissipation of only 1.1 W, the module runs cool, extending its service life. Regular inspection of wiring connections and status indicators helps maintain optimal performance.
Compatibility & Integration
The 1734-IJ is designed for Rockwell Automation POINT I/O systems, integrating with Allen-Bradley PLCs and communication adapters. It produces 6 or 10 bytes of input data (scanner Rx) and consumes 1 byte of I/O data (scanner Tx), making it straightforward to configure in RSLogix 5000 or Studio 5000 environments.
Selection Guide & Purchasing Advice
Before purchasing, verify that your system has a POINT I/O adapter and compatible wiring base. The 1734-IJ is a genuine Allen-Bradley part, ensuring reliability and performance. When sourcing replacement modules, choose a trusted supplier like PLC Source PRO to guarantee authentic components and fast delivery.