1756-OF8K Module Specifications

Outputs

This module provides eight voltage or current outputs with the following characteristics:

• Output Range: ±10V or 0-20 mA
• Resolution: 15 bits across 21 mA (650 nA/bit) and 15 bits across 10.4V (320 µV/bit)
• Current Draw: 150 mA @ 5.1V and 210 mA @ 24V
• Total Backplane Power: 5.8 W

Voltage and Current Ratings

• Backplane: 5.1V DC, 150 mA max; 24V DC, 210 mA max
• Output Voltage: -10V to +10V
• Output Current: 4-20 mA
• Power Consumption: 5.8 W backplane power
• Power Dissipation: 5.8 W to 3.15 W depending on load resistance
• Thermal Dissipation: 16.78 BTU/hr

Protection and Performance

• Open Circuit Detection: For current output only (output must be set to >0.1 mA)
• Overvoltage Protection: 24V DC
• Short Circuit Protection: Electronically current limited to 21 mA or less
• Drive Capability: Voltage > 2000 Ω, Current 0-750 Ω
• Settling Time: Less than 2 ms to 95% of final value with resistive loads

Accuracy and Calibration

• Calibrated Accuracy @ 25°C (77°F): Better than 0.05% of range from 4-21 mA, -10.4-10.4V
• Calibration Interval: 12 months typical
• Offset Drift: 50 µV/°C typical (Voltage mode), 0.1 µA/°C typical (Current mode)
• Gain Drift with Temperature: 25 ppm/°C max (Voltage), 50 ppm/°C max (Current)
• Module Error: 0.15% of range (Voltage), 0.3% of range (Current)

Module Specifications

• Module Scan Time: Minimum 12 ms floating point, 8 ms integer
• Data Format: Integer mode (left justified, 2's complement) and IEEE 32-bit floating point
• Module Conversion Method: R-Ladder DAC, ensuring monotonicity with no missing codes
• Isolation Voltage: 250V (continuous), reinforced insulation type, output channels to backplane; no isolation between individual output channels
• Module Keying: Electronic, software configurable
• Removable Terminal Block: 1756-TBNH or 1756-TBSH
• RTB Keying: User-defined mechanical
• Slot Width: 1
• Terminal Block Torque Specs: 1.36 N•m (12 lb•in)

Environmental Specifications

• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Nonoperating Temperature: -40°C to +85°C (-40°F to +185°F)
• Relative Humidity: 5-95% noncondensing
• Vibration: 2 g @ 10-500 Hz
• Shock: 30 g operating, 50 g nonoperating
• Emissions: IEC 61000-6-4
• ESD Immunity: IEC 61000-4-2 (6 kV contact discharges, 8 kV air discharges)
• EFT/B Immunity: IEC 61000-4-4 (±4 kV at 5 kHz on signal ports)
• Surge Transient Immunity: IEC 61000-4-5 (±1 kV line-line, ±2 kV line-earth on signal ports)
• Conducted RF Immunity: IEC 61000-4-6 (10V rms with 1 kHz sine-wave 80% AM from 150 kHz to 80 MHz)

Enclosure and Mechanical Specifications

• Wiring Category: 1 - on signal ports
• Enclosure Type: None (open-style)
• Temperature Codes: North American: T4A, ATEX: T4, IECEx: T4