1756-OF8 Analog Output Module Allen-Bradley ControlLogix
Introduction:
1756-OF8 is an Allen‑Bradley ControlLogix analog output module with eight configurable channels for 0‑20 mA current or ±10V DC voltage signals and 15‑bit resolution.
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1756-OF8 – 8-Channel Analog Output Module for ControlLogix
The 1756-OF8 from Allen-Bradley delivers eight configurable analog outputs for Rockwell Automation ControlLogix systems. This module handles both voltage and current signals for precise field device control. You can use it as local or distributed I/O in your automation architecture.
- The 1756-OF8 provides eight output channels configurable for +/-10V DC voltage or 0-20 mA current signals.
- Resolution reaches 15 bits across 21 mA (650 nA/bit) and 15 bits across 10.4V (320 µV/bit).
- The module uses R-Ladder DAC conversion with monotonicity and no missing codes for reliable output.
- Data formats include integer mode (left justified, 2’s complement) and IEEE 32-bit floating point.
- Open circuit detection works only for current outputs, while short circuit protection limits current to 21 mA or less.
Technical Specifications
- Brand: Allen-Bradley / Rockwell Automation
- Model: 1756-OF8 (ControlLogix series)
- Module Type: Analog output module, 8 points current/voltage
- Output Current Range: 0-20 mA
- Output Voltage Range: +/-10V DC
- Resolution: 15 bits
- Conversion Method: R-Ladder DAC, monotonic with no missing codes
- Open Circuit Detection: Current outputs only
- Short Circuit Protection: Electronically limited to 21 mA or less
- Overvoltage Protection: 24V DC
- Backplane Current (5V): 140 mA
- Backplane Current (24V): 210 mA
- Power Dissipation (Max): 4.9 Watts at 60°C
- Removable Terminal Blocks: 1756-TBNH or 1756-TBSH (sold separately)
- Isolation Voltage: 50V continuous, 250V reinforced (tested at 1350V AC for 2 seconds)
- Scan Time: 12 ms for floating point, 8 ms for integer format
- Overall Module Error: 0.15% (voltage mode), 0.3% (current mode)
- Offset Drift: 50 ppm/°C (voltage), 0.1 ppm/°C (current)
- Gain Drift: 25 ppm/°C (voltage), 50 ppm/°C (current)
- Operating Temperature: 0°C to 60°C
- Shock Rating: 30G
- Vibration Rating: 2G at 10 to 500 Hz
- Enclosure Type: Open style
- Temperature Codes: T4A (North America), T4 (ATEX), T4 (IEC)
- UPC: 10612598171894
- UNSPSC: 32151705
Installation Guidelines
- Insert the 1756-OF8 into any available slot of your ControlLogix chassis.
- Use appropriate removable terminal blocks: 1756-TBNH or 1756-TBSH (order separately).
- For 1756-TBNH, use 22-14 AWG copper wire rated at 105°C with 1.2 mm max insulation.
- For 1756-TBSH, use shielded 22-14 AWG copper wire with single wire connection only.
- Maintain ambient temperature between 0°C and 60°C for proper operation.
- Route analog output wires separately from AC power lines to reduce electrical noise.
- Ground the shield of each analog output cable at only one end to prevent ground loops.
Package Contents
- One Allen-Bradley 1756-OF8 analog output module
- One product information label
- Removable terminal blocks not included (order 1756-TBNH or 1756-TBSH separately)
Shipping Options
- We ship worldwide using FedEx, UPS, or DHL express services.
- Orders ship within 24 hours on business days after payment confirmation.
- You will receive a tracking number via email immediately after dispatch.
Frequently Asked Questions (FAQ)
- Can the 1756-OF8 output both voltage and current on the same channel? No, each channel is configurable for either voltage or current, not both simultaneously.
- What software configures this module? Use RSLogix 5000 or Studio 5000 Logix Designer software.
- Does the module support HART communication? No, the standard 1756-OF8 does not support HART. Use 1756-OF8H for HART capability.
- How do I connect a 4-20 mA loop powered device? The module sources current, so connect the positive wire to the output channel and return to the common terminal.
- What happens during a processor fault? You can configure each channel to hold last state, go to a user-defined value, or zero.
- Can I use this module in a hazardous location? Yes, the T4 temperature ratings allow use in Class I Division 2 hazardous locations.
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