ALLEN BRADLEY 1756-OF8IH ControlLogix Analog Output Module

Manufacturer

Allen-Bradley

Model/Part Number

1756-OF8IH

Description

ControlLogix Analog Output Module, 8 Isolated Current Outputs with HART support

Outputs

8 current channels

Output Range

0…20 mA, 4…20 mA

Resolution

15 bits across 24 mA (732 nA per bit)

Voltage & Current Ratings

- Backplane: 220 mA @ 5.1V DC, 360 mA @ 24V DC   - Output Voltage Range: 5…30V DC  - Output Current: 0…20 mA, 4…20 mA

Current Draw @ 24V

400 mA (estimated)

Power Dissipation (Max)

6.5 W nominal  - <6.4 W with 50 Ω load  - <6.5 W with 250 Ω load  - <6.7 W with 750 Ω load

Open Circuit Detection

Yes, for current output ≥ 0.1 mA

Overvoltage Protection (Max)

±24V DC

Output Short Circuit Protection

Electronically limited to ≤ 21 mA

Drive Capability

50…750 Ω with short circuit survival

Load Reactance (Max)

10 µH

Settling Time

< 23 ms (HART disabled), < 100 ms (HART enabled) to 95% with resistive loads

Calibrated Accuracy @ 25°C

0.15% of span @ 4…20 mA

Calibration Interval

12 months typical

Offset Drift

±3 ppm of full scale range/°C (72 nA/°C typical)

Gain Drift with Temperature

±4 ppm of full scale range/°C

Module Error

0.3% @ 4…20 mA

Module Scan Time (Estimate)

~1 s (with all channels HART enabled)

Data Format

IEEE 32-bit floating point

Output Conversion Method

R-Ladder DAC

Isolation Voltage

250V continuous  - Reinforced: outputs to backplane  - Basic: output-to-output & output-to-ground

Module Keying

Electronic, software configurable

Removable Terminal Block

1756-TBCH, 1756-TBS6H

RTB Keying

User-defined mechanical

Slot Width

1

Wire Size

0.33…2.1 mm² (22…14 AWG), solid/stranded shielded copper wire, 105 °C rating

Insulation Max

1.2 mm (3/64 in.)

Terminal Block Torque

0.5 N•m (4.4 lb•in)

Wiring Category

Category 2 (signal ports)

Wire Type

Copper

Enclosure Type Rating

None (open-style)

Temperature Code

- North American: T4A  - ATEX: T4  - IECEx: T4