ControlLogix 1756-OF6CI Module Overview

The ControlLogix 1756-OF6CI is a high-performance 6-point isolated analog output module, designed for precision current output in industrial automation systems. This module provides accurate and reliable signal conversion and transmission within ControlLogix systems.

Electrical Specifications

• Range: 0mA - 21mA
• Number of Significant Bits: 13 bits
• Resolution: 2.7μA
• Available Range: 0mA - 20mA
• Low Signal and User Counts: 0mA / -32768 counts
• High Signal and User Counts: 21.074mA / 32767 counts
• Recommended Instrument Ranges: DMM with resolution better than 1.0μA

Output Specifications

• Number of Outputs: 6 individually isolated channels
• Output Current Range: 0 to 21mA
• Current Resolution: 13 bits across 21mA (2.7μA)
• Data Format: Left justified, 2s complement – Integer mode; IEEE 32 bit – Floating point mode
• Output Overvoltage Protection: 24V ac/dc maximum
• Output Short Circuit Protection: Electronically current limited to 21mA or less
• Output Settling Time: <2ms to 95% of final value with resistive loads
• Calibrated Accuracy: Better than 0.1% of range from 4mA to 21mA
• Calibration Interval: 12 months
• Output Offset Drift with Temperature: 1 μA/°C
• Gain Drift with Temperature: Typical: 60 ppm/°C, Worst case: 100 ppm/°C
• Module Error over Full Temperature Range: 0.6% of range
• Minimum Module Scan Time for All Channels: 25ms minimum (Floating point mode), 10ms minimum (Integer mode)

Mechanical Specifications

• Module Location: 1756 ControlLogix Chassis
• Backplane Current:
  • 0-550 loads: 250mA @ 5.1V dc & 225mA @ 24V dc (load terminated on OUTs and RTNs)
  • 551-1000 loads: 250mA @ 5.1V dc & 300mA @ 24V dc (load terminated on OUTs and ALTs)
• Backplane Power:
  • 0-550 loads: 6.7W
  • 551-1000 loads: 8.5W
• Power Dissipation within Module:
  • 0-550 loads: 5.5W
  • 551-1000 loads: 6.1W
• Thermal Dissipation:
  • 0-550 loads: 18.76 BTU/hr.
  • 551-1000 loads: 20.80 BTU/hr.
• Inductive Load: <1 mH
• RTB Screw Torque: 7-9 inch-pounds (0.8-1Nm)
• RTB Keying: User defined
• RTB and Housing: 20 Position RTB (1756-TBNH or TBSH)
• Conductors:
  • Wire Size: #22 to #14 AWG (0.324 to 2.08 sq. mm) stranded
  • Insulation: 3/64 inch (1.2mm) maximum
  • Category: 2(3), (4)

Environmental Specifications

• Isolation Voltage:
  • Channel to channel: Optoisolated, transformer isolated
  • User to system: 100% tested at 1700V dc for 1s, based on 250V ac
• Vibration Resistance: IEC60068-2-6 (Test Fc, Operating): 2g @ 10-500Hz
• Operating Shock: IEC60068-2-27 (Test Ea, Unpackaged shock): 30g
• Non-Operating Shock: IEC60068-2-27 (Test Ea, Unpackaged shock): 50g
• Emissions: CISPR 11: Group 1, Class A
• ESD Immunity: IEC 61000-4-2: 6kV contact discharges, 8kV air discharges