Is Your Control System Stuck with Obsolete Analog Inputs?
Legacy analog modules often force costly downtime and limit your ability to scale. The Allen-Bradley 1734-IE2C is a POINT I/O analog input module that delivers two single-ended, non-isolated current channels with 16-bit resolution. It reads 0–20 mA or 4–20 mA signals and converts them to signed integer data for your controller. This module is the direct replacement for aging 1734 series I/O, helping you modernize without a full system overhaul.
Technical Specifications That Drive Performance
The 1734-IE2C packs key specs that matter on the plant floor:
- Channels: Two (2) single-ended, non-isolated current inputs
- Resolution: 16 bits over 0…21 mA (0.32 µA/cnt)
- Input Signal: 0–20 mA; 4–20 mA (configurable)
- Absolute Accuracy: 0.1% Full Scale @ 25 °C
- Conversion Type: Delta Sigma
- Current Draw: 75 mA @ 5V DC
- Power Dissipation: 0.6 W @ 28.8V DC
- Dimensions: 56 x 12 x 75.5 mm (2.2 x 0.47 x 2.97 in.)
- Operating Voltage: 10 to 28.8 Volts DC
- Isolation: 50 Volts continuous
What These Specs Mean for You
16-bit resolution lets you detect tiny signal changes, improving process accuracy. The 0.1% full-scale accuracy reduces measurement errors. With a current draw of only 75 mA at 5V DC, you save power and reduce heat. The compact 56 x 12 x 75.5 mm size fits tight panels, and the open-style enclosure works inside protected cabinets.
Comparison: 1734-IE2C vs. Similar Analog Modules
| Feature | 1734-IE2C | Typical 4-channel module | Typical 8-channel module |
|---|---|---|---|
| Channels | 2 | 4 | 8 |
| Resolution | 16 bits | 16 bits | 16 bits |
| Input signal | 0-20/4-20 mA | 0-20/4-20 mA | 0-20/4-20 mA |
| Current draw @5V DC | 75 mA | 120 mA | 200 mA |
| Dimensions (mm) | 56 x 12 x 75.5 | 56 x 24 x 75.5 | 56 x 48 x 75.5 |
Note: Comparison values for non-1734-IE2C modules are typical and for reference only.
Where the 1734-IE2C Fits: Real-World Applications
- Process Control: Monitor pressure, flow, or level transmitters in food and beverage plants. The 4–20 mA signal provides reliable data over long cable runs.
- Machine Monitoring: In automotive assembly, track hydraulic pressure to prevent tool wear. The 80 ms step response at 50 Hz notch captures fast changes.
- Remote I/O: Use with DeviceNet or ControlNet adapters to distribute I/O across large facilities, reducing wiring costs.
Upgrade Path: Replacing Legacy Modules
If you run older 1734 analog modules, the 1734-IE2C offers a straightforward upgrade. It uses the same terminal bases (1734-TB, 1734-TBS, 1734-TOP, 1734-TOPS) and keyswitch position 3. You can swap modules without rewiring, minimizing downtime. The module works with any POINT I/O communication adapter and integrates with ControlLogix and CompactLogix controllers. For best results, verify your adapter firmware supports the module’s data format (signed integer).
Installation and Setup Essentials
Mount the module on a 35 mm DIN rail, horizontally or vertically. Use the correct terminal base and set the keyswitch to position 3. Wire input signals with 22–14 AWG shielded copper wire rated at 167 °F or higher. Power the module with an external 10–28.8 V DC supply. After wiring, configure each channel for 0–20 mA or 4–20 mA in your Logix program. No calibration is needed—the module is factory calibrated.
Maintenance and Reliability Tips
Inspect connections periodically for tightness and corrosion. Keep the enclosure free of dust and moisture. The open-style design requires a clean, protected environment. With no moving parts, the 1734-IE2C offers long service life. For ROI, consider that fewer replacements and less downtime quickly offset the initial cost. Always follow the manufacturer’s safety manual for any maintenance.
Compatibility and Integration
The 1734-IE2C communicates over ControlNet, DeviceNet, and EtherNet/IP when paired with the appropriate adapter. It works with any Allen-Bradley controller platform, especially CompactLogix and ControlLogix. This flexibility lets you integrate the module into existing networks without major changes.
Selection Guide: What to Verify Before Buying
- Confirm you need 2 current input channels (not voltage).
- Check that your terminal base is 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS.
- Ensure your power supply provides 10–28.8 V DC.
- Verify your controller supports POINT I/O and the chosen protocol.
SpareTechPLC stocks the 1734-IE2C and can help you confirm compatibility. Contact us for current availability and lead times.
Frequently Asked Questions
Q: Can I use the 1734-IE2C with a 0–10 V signal?
A: No, this module only accepts current inputs (0–20 mA or 4–20 mA).
Q: What is the maximum overload the module can handle?
A: It is fault protected up to 28.8 V DC.
Q: Do I need to calibrate the module after installation?
A: No, it is factory calibrated. No field calibration is required.
Q: Which terminal bases work with this module?
A: Use 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS.
Q: What is the input update rate at 60 Hz notch?
A: The module updates all channels every 100 ms at 60 Hz notch (default).
