ControlLogix Current Loop Output Module
15
Publication 1756-5.36 - September 1999
1756-OF6CI Specifications
Number of Outputs
6 individually isolated channels
Module Location
1756 ControlLogix Chassis
Backplane Power Requirements
(No external power requirements)
250mA @ 5.1V dc & 225mA @ 24V dc (0-550
Ω
loads terminated
on OUTs and RTNs) (6.7W)
250mA @ 5.1V dc & 300mA @ 24V dc (551-1000
Ω
loads
terminated on OUTs and ALTs) (8.5W)
Power Dissipation within Module
Thermal Dissipation
5.5W (0-550
Ω
loads)
6.1W (551-1000
Ω
loads)
18.76 BTU/hr (0-550
Ω
loads)
20.80 BTU/hr (551-1000
Ω
loads)
Output Current Range
0 to 21mA
Current Resolution
13 bits across 21mA (2.7µA)
Data Format
Integer mode (Left justified, 2s complement)
Floating point IEEE 32 bit
Open Circuit Detection
None
Output Overvoltage Protection
24V ac/dc maximum
Output Short Circuit Protection
Electronically current limited to 21mA or less
Drive Capability
0-1000
Ω
Separate field terminations for ranges 0-550
Ω
or 551-1000
Ω
Output Settling Time
<2ms to 95% of final value with resistive loads
Calibrated Accuracy at 25°C
Calibration Interval
Better than 0.1% of range from 4mA to 21mA
Six months typical
Output Offset Drift with Temperature
1 µA/degree C typical
Gain Drift with Temperature
60 ppm/degree C typical (100 ppm maximum)
Module Error over Full Temp. Range
0.6% of range
Module Scan Time for all Channels
25ms maximum floating point
10ms maximum integer
Isolation Voltage
Channel to channel
User to system
Optoisolated, tranformer isolated
100% tested at 1700V dc for 1s, based on 250V ac
100% tested at 1700V dc for 1s, based on 250V ac
Module Conversion Method
R-Ladder DAC, monotonicity with no missing codes
Inductive Load
<1 mH
RTB Screw Torque (NEMA)
7-9 inch-pounds (0.8-1Nm)
Module Keying (Backplane)
Electronic
RTB Keying
User defined
Field Wiring Arm and Housing
20 Position RTB (1756-TBNH or TBSH)
1
Environmental Conditions
Operating Temperature
Storage Temperature
Relative Humidity
0 to 60°C (32 to 140°F)
-40 to 85°C (-40 to 185°F)
5 to 95% noncondensing
Conductors
Wire Size
Category
22-14 gauge (2mm
2
) stranded maximum
1
3/64 inch (1.2mm) insulation maximum
2
2, 3
Screwdriver Width for RTB
5/16 inch (8mm) maximum
Allen-Bradley Drives