Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1734-OE2C |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | Analog Current Output Module |
| Product Family | POINT I/O 1734 |
| Output Channels | 2 (single-ended, non-isolated) |
| Output Signal Range | 4-20 mA (default), 0-20 mA (configurable) |
| Supply Voltage | 24V DC |
| Resolution | 13 bits over 0-21 mA (2.5 µA/count typical) |
| Conversion Rate | 16 µs |
| Absolute Accuracy | 0.1% Full Scale @ 25°C |
| Step Response (63% FS) | 24 µs |
| Resistive Load | 0-750 Ohms |
| Isolation Voltage | 50V continuous (2200V DC tested for 60s) |
| POINTBus Current | 75 mA @ 5V DC |
| Power Dissipation | 1.23 W @ 750 Ohm load; 1.83 W @ 0 load |
| Operating Temperature | -20°C to +55°C |
| Mounting | DIN Rail (requires 1734-TB series base) |
| Enclosure Rating | None (open-style) |
| Dimensions (L×W×H) | 56 × 12 × 75.5 mm |
| Weight | Approx. 0.06 kg |
Main Features and Advantages
Configurable Output Range and Engineering Scaling: The Allen-Bradley 1734-OE2C provides each channel with independent configuration for 4-20 mA or 0-20 mA operation, with 4-20 mA as the factory default . Beyond range selection, the module supports programmable engineering low and high values, allowing raw integer data from the PLC to be scaled directly to meaningful engineering units before conversion to analog current. Default scaling points are 1638 counts at 4 mA and 8191 counts at 20 mA, with configurable low and high limits that enable the module to clamp output at application-defined boundaries . This flexibility eliminates the need for external signal conditioners or scaling in the PLC program.
Comprehensive Diagnostic and Fault Handling: The 1734-OE2C incorporates open-wire detection on each output channel, setting a general status bit when a broken wire or loss of field power occurs. The channel indicator blinks red under open-wire conditions, providing immediate visual diagnostics . More critically, the module supports four configurable fault modes per channel: hold last state, clamp to low limit, clamp to high limit, or go to a user-defined fault value . This capability allows engineers to define safe actuator positions during fault conditions, a critical requirement in process control where an uncontrolled output could damage equipment or create safety hazards.
Compact Distributed I/O Architecture: The Allen-Bradley 1734-OE2C measures just 12 mm wide, enabling high-density installation in space-constrained control cabinets. As part of the POINT I/O system, the module supports hot-swapping under power and can be mounted in horizontal or vertical orientations . The modular design allows mixing of analog and discrete I/O modules on the same POINTBus backplane, providing flexibility to scale the I/O configuration as application requirements evolve .
Precision Signal Conversion: With 13-bit resolution, the 1734-OE2C converts digital codes to analog current with a resolution of approximately 2.5 µA per count over the 0-21 mA range . The 0.1% full-scale accuracy at 25°C and 30 ppm/°C temperature drift ensure that the output signal remains accurate across the operating temperature range. The 16 µs conversion rate and 24 µs step response (to 63% of full scale) provide the speed necessary for closed-loop control applications where output updates must track rapidly changing setpoints .
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