1734-1E8C

Overview of Allen Bradley 1734-IE8C

The Allen Bradley 1734-IE8C is a high-density analog current input module designed for the POINT I/O distributed control platform. This compact module provides eight single-ended, non-isolated current input channels capable of accepting 4-20 mA or 0-20 mA analog signals. With 16-bit resolution across the full 0-21 mA range, the 1734-IE8C delivers precise signal conversion at 0.32 µA per count, making it suitable for applications requiring accurate process monitoring and control. The module employs delta-sigma conversion technology to process all eight channels simultaneously, ensuring consistent data acquisition across multiple inputs. Factory-calibrated for immediate deployment, the 1734-IE8C offers 0.1% full-scale absolute accuracy at 25°C and maintains stability with only 30 ppm/°C temperature drift. The module stores converted data as signed integers within the PLC memory, creating 24 bytes of channel data and status information for channels 0-7, enabling straightforward integration with Allen Bradley control systems.

Key Features of Allen Bradley 1734-IE8C

• Eight Current Input Channels: Single-ended configuration supports 4-20 mA or 0-20 mA signals
• 16-Bit Resolution: Provides 0.32 µA/count precision across 0-21 mA range
• Delta-Sigma Conversion: Simultaneous processing of all channels for consistent data acquisition
• Channel-Level Diagnostics: Individual channel monitoring and fault detection capabilities
• Configurable Input Filters: Adjustable notch frequencies from 50 Hz to 480 Hz for noise rejection
• Low Power Consumption: Maximum 0.6 W at 28.8V DC with 2.0 BTU/hr thermal dissipation

Technical Specs of 1734-IE8C

Input Channels	8 single-ended, non-isolated current inputs
Signal Range	4-20 mA, 0-20 mA
Resolution	16 bits (0.32 µA/count)
Accuracy	0.1% full scale at 25°C
Update Rate	200-480 ms (dependent on notch filter setting)
Input Impedance	60 Ohms
Field Power Supply	10-28.8V DC, 30 mA, Class 2
POINTBus Current	75 mA maximum
Isolation Voltage	50V continuous, tested at 1500V AC for 60 seconds
Dimensions	56 x 12 x 75.5 mm (2.21 x 0.47 x 2.97 in)
Weight	36 g (1.235 oz)
Terminal Base	1734-TB, 1734-TBS compatible
Data Format	Signed Integer

Applications / Use Case

The Allen Bradley 1734-IE8C serves as a critical interface between analog field devices and distributed control systems in industrial automation environments. Common applications include process monitoring systems where pressure transmitters, flow meters, and level sensors transmit 4-20 mA signals to the control system for real-time process supervision. The module excels in remote I/O configurations where space constraints demand compact solutions, as its slim 12 mm profile allows for high-density installation in control cabinets. Manufacturing facilities use the 1734-IE8C for data acquisition from multiple analog sensors distributed across production lines, taking advantage of its simultaneous channel conversion to maintain synchronous data collection. The individually configurable channels support mixed sensor types within a single module, reducing hardware costs and simplifying system architecture. Its channel-level diagnostics enable predictive maintenance programs by detecting sensor faults, wire breaks, and out-of-range conditions before they impact production. The module integrates seamlessly with Allen Bradley Logix controllers through POINT I/O communication adapters, supporting flexible network topologies in both centralized and distributed control architectures. Temperature coefficient stability makes it suitable for installations in variable ambient conditions typical of industrial environments.

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