Order now the 1794-IF2XOF2I, a versatile combination analog module for the Allen-Bradley FLEX I/O platform. Providing two isolated inputs and two isolated outputs, this module is the perfect solution for compact control loops where both sensing and actuation are required in a single, space-saving footprint.
What Is the 1794-IF2XOF2I?
The 1794-IF2XOF2I is a high-precision combination analog module featuring channel-to-system and channel-to-channel isolation. It provides 2 channels of analog input and 2 channels of analog output, supporting both voltage and current signals. The isolation is a critical feature for process industries, as it prevents ground loops and protects the control system from voltage transients common in large-scale plants. This module belongs to the FLEX I/O family, meaning it mounts on a terminal base (like the 1794-TB3 or 1794-TB3S) and supports «hot-swapping» via RIUP. It is ideal for small PID loops where a dedicated input and output module would be overkill and waste valuable DIN rail space.
Key Technical Specifications
- Channels: 2 Isolated Inputs / 2 Isolated Outputs
- Input/Output Ranges: 0…20 mA, 4…20 mA, +/-10V DC, 0…10V DC
- Resolution: 15-bit + sign
- Isolation: 120V (continuous) between all channels and system
- Data Format: 16-bit 2’s complement
- External Power: 24V DC nominal
- Conversion Type: Sigma-Delta
- Terminal Base: 1794-TB3, 1794-TB3S
Precision Architecture and Loop Control
The 1794-IF2XOF2I uses high-resolution converters to ensure accuracy within 0.1% of the full scale. The internal architecture includes advanced filtering to reject 50/60 Hz line noise. This makes it particularly effective for controlling variable speed drives or proportional valves based on pressure or flow sensor feedback. By isolating each channel, Allen-Bradley ensures that a fault on a field sensor cable will not affect the output signal going to a critical valve positioner.
Installation Advice
When installing the 1794-IF2XOF2I, pay close attention to the keyswitch position on the terminal base; it must be set to position 4. To maintain the 15-bit precision, use shielded cables for all analog loops. Connect the shields to the ground terminals on the 1794-TB3G base to provide a low-impedance path for EMI. If using the module for current loops, ensure the 24V DC field power is clean and well-regulated to avoid ripple affecting the analog-to-digital conversion.
Frequently Asked Questions
Q: Can I use one channel for 4-20mA and another for 0-10V?
A: Yes, each channel on the 1794-IF2XOF2I is individually configurable via the controller software for different signal types.
Q: Does this module require an external power supply?
A: Yes, it requires external 24V DC power to operate the analog circuitry and maintain the isolated loops.
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