Allen-Bradley 1734-IE2C Analog Input Module Overview
The Allen-Bradley 1734-IE2C is a compact analog input module from the POINT I/O family. It provides two single-ended, non-isolated current input channels. Each channel supports 0-20 mA and 4-20 mA signals, making it versatile for various industrial sensors and transmitters. This module is designed for use with any POINT I/O communication adapter, allowing seamless integration into existing automation systems.
Engineers favor the 1734-IE2C for its high-resolution 16-bit conversion, which delivers precise readings across the 0 to 21 mA range. The module uses Delta-Sigma conversion technology, ensuring stable and accurate data. With an absolute accuracy of 0.1% Full Scale at 25°C, it meets the demands of most process control applications.
Key Technical Specifications
- Input channels: Two (2) single-ended, non-isolated
- Signal range: 0-20 mA or 4-20 mA, software-selectable
- Resolution: 16 bits, 0.32 μA/count
- Step response: 80 ms (50 Hz notch), 70 ms (60 Hz), 16 ms (250 Hz), 8 ms (500 Hz)
- Update rate: 120 ms (50 Hz), 100 ms (60 Hz), 24 ms (250 Hz), 12 ms (500 Hz)
- Power dissipation: 0.6 W @ 28.8V DC
- Dimensions: 56 x 12 x 75.5 mm
Wiring and Mounting Best Practices
Proper wiring is critical for optimal performance. Use 22 to 14 AWG shielded copper wire rated for at least 167°F. The module requires a compatible terminal base such as the 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS. Set the keyswitch to position 3 before mounting. You can install the module horizontally or vertically on a standard 35 mm DIN rail.
For communication, the 1734-IE2C works with ControlNet, DeviceNet, and EtherNet/IP adapters. This flexibility lets you integrate the module into various network architectures. The module also supports any Allen-Bradley controller platform, especially CompactLogix and ControlLogix systems.
Performance and Calibration
The module comes factory-calibrated, so no manual calibration is needed. It provides signed integer data format, which simplifies data handling in your control program. The input step response and update rate vary with the notch filter setting. Choose the appropriate notch frequency to balance noise rejection and speed.
With a maximum overload protection of 28.8V DC, the 1734-IE2C safeguards against voltage spikes. Its open-style enclosure requires installation in a clean, protected environment. The module draws 75 mA at 5V DC and dissipates only 0.6 W, keeping energy consumption low.
In summary, the Allen-Bradley 1734-IE2C offers reliable, precise current measurement in a compact form. Its compatibility with multiple networks and controllers makes it a practical choice for many automation projects. For engineers seeking a robust analog input solution, this module delivers consistent performance with minimal maintenance.