Allen-Bradley 1756-OF8 ControlLogix Analog Output Module

The Allen-Bradley 1756-OF8 is an analog output module from the ControlLogix product family, featuring eight output channels configurable for both +/-10VDC voltage and 0-20 mA current output signals. It offers high resolution and can be used as a local or distributed I/O module.

General Specifications

• Outputs: 8 voltage or current outputs
• Output Range: ±10V or 0…20 mA
• Resolution: 15 bits (21 mA – 650 nA/bit or 10.4V – 320 µV/bit)
• Current Draw: 150 mA at 5.1V, 210 mA at 24V
• Total Backplane Power: 5.8 W
• Power Consumption: 5.8 W (max)
• Power Dissipation: 5.8 W to 3.15 W (0 to 750 ohm loads)
• Thermal Dissipation: 16.78 BTU/hr
• Open Circuit Detection: Current output only (set to >0.1 mA)
• Overvoltage Protection: 24V DC
• Short Circuit Protection: Electronically current limited to 21 mA or less
• Drive Capability: Voltage: >2000Ω, Current: 0…750Ω
• Settling Time: <2 ms to 95% of final value with resistive loads
• Calibration Interval: 12 months typical
• Module Keying: Electronic, software configurable
• Removable Terminal Block: 1756-TBNH or 1756-TBSH

Wiring Specifications

• Wire Size:
  • 1756-TBNH:
    • Single: 0.33…2.1 mm² (22…14 AWG), solid/stranded copper, rated at 105 °C (221 °F)
    • Double: 0.33…1.3 mm² (22…16 AWG)
  • 1756-TBSH: Single: 0.33…2.1 mm² (22…14 AWG), shielded copper
• Terminal Block Torque Specs: 1.36 N•m (12 lb•in)
• Slot Width: 1

Environmental Specifications

• Operating Temperature: 0 °C to +60 °C (+32 °F to +140 °F)
• Non-operating Temperature: -40 °C to +85 °C (-40 °F to +185 °F)
• Relative Humidity: 5…95% non-condensing
• Vibration: 2 g @ 10…500 Hz
• Operating Shock: 30 g
• Non-operating Shock: 50 g

Certifications

• UL: UL Listed Industrial Control Equipment
• CSA: Certified for Class I, Division 2 Group A, B, C, D Hazardous Locations
• FM: Approved for use in Class I Division 2 Groups A, B, C, D
• CE: Compliant with EU EMC and LVD directives
• ATEX & IECEx: Compliant for use in explosive atmospheres

Additional Information

• Isolation Voltage: 250V (continuous), routine tested at 1350V AC for 2 s
• Module Error: Voltage: 0.15% of range, Current: 0.3% of range
• Module Scan Time: 12 ms (floating point), 8 ms (integer)
• Data Format: Integer mode (left justified, 2’s complement), IEEE 32-bit floating point

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