18 ControlLogix Voltage/Current Output Module
Publication
1756-IN016B-EN-P - November 2003
1756-OF4
Specifications
Number of Outputs 4 voltage or current outputs
Module Location 1756 ControlLogix Chassis
Backplane Current 150mA @ 5.1V dc & 120mA @ 24V dc
Backplane Power 5.8W
Power Dissipation within Module 3.2W – 4 channel current
Thermal Dissipation 10.91 BTU/hr.
Output Range +/- 10.4V
0 to 21mA
Resolution 15 bits across 10.4V - 320
µV/bit – Voltage
15 bits across 21mA - 650nA/bit – Current
Data Format Left justified, 2s complement – Integer mode
IEEE 32 bit – Floating point
Open Circuit Detection Current output only (Output must be set to >0.1mA)
Output Overvoltage Protection 24V dc
Output Short Circuit Protection Electronically current limited to 21mA or less
Drive Capability >2000
Ω – Voltage
0-750
Ω – Current
Output Settling Time <2ms to 95% of final value with resistive loads
Calibrated Accuracy Better than 0.05% of range from 4mA to 21mA,
-10.4V to 10.4V
Calibration Interval Twelve months – Typical
Output Offset Drift with
Temperature
50µV/°C
100nA/°C
Gain Drift with Temperature 25 ppm/°C – Voltage
520
µV/°C
50 ppm/°C – Current
1050
µA/°C
Module Error over Full
Temperature Range
0.15% of range – Voltage
0.3% of range – Current
Module Scan Time for all Channels 12ms minimum – Floating point
8ms minimum – Integer
Isolation Voltage
User to system 100% tested at 2550V dc for 1 second
125V continuous
Module Conversion Method R-Ladder DAC, monotonicity with no missing codes
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