The Allen-Bradley 1756-OF8IH is an 8-channel isolated analog output module for the ControlLogix platform, featuring HART communication capability on every channel. This module provides precise 4–20 mA current outputs for controlling valves, positioners, and other field devices in process automation applications.
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1756-OF8IHOrder(MOQ) :
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EXWProduct Origin :
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WuhanLead Time :
3~5 daysWeight :
5kg| Specification | Description |
|---|---|
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Model | 1756-OF8IH |
| Product Family | ControlLogix HART Analog I/O |
| Product Type | Isolated Analog Output Module with HART |
| Output Channels | 8 isolated differential outputs |
| Output Signal | 4–20 mA (also supports 0–20 mA) |
| Resolution | 15 bits across 24 mA (732 nA per bit) |
| HART Communication | 1 HART modem per channel |
| Calibrated Accuracy | 0.15% @ 4–20 mA, 25°C |
| Drive Capability | 50–750 Ω with short circuit survival |
| Isolation Voltage | 250V continuous (reinforced, outputs to backplane; basic, output to output) |
| Output Short Circuit Protection | Current electronically limited to ≤21 mA with no damage |
| Overvoltage Protection | ±24V DC |
| Data Format | IEEE 32-bit floating point |
| Backplane Current | 220 mA @ 5.1V DC; 360 mA @ 24V DC |
| Power Dissipation | 6.5 W maximum |
| Operating Temperature | 0°C to +60°C |
| Certifications | CE, CUL, KC, RCM, UL |
| Country of Origin | Mexico |
| Lifecycle Status | Active |
| Model | Description | Typical Application |
|---|---|---|
| 1756-OF8IH (this model) | 8-channel isolated analog output with HART | Process control with HART field devices |
| 1756-OF8H | 8-channel non-isolated analog output with HART | Standard HART applications |
| 1756-IF8IH | 8-channel isolated analog input with HART | Input counterpart for HART control loops |
| 1756-IF8H | 8-channel non-isolated analog input with HART | Standard HART input applications |
| 1794-OF8IH | FLEX I/O version, 8-channel isolated output with HART | Distributed I/O applications |
| 5094-OF8IH | FLEX 5000 version, 8-channel output with HART | Modern distributed I/O platform |
| 1756-TBCH | Removable Terminal Block (screw type) | Required terminal block for wiring |
| 1756-TBS6H | Removable Terminal Block (spring type) | Alternative terminal block option |
Q1: What is the primary function of the 1756-OF8IH?
The 1756-OF8IH is an 8-channel isolated analog output module with HART communication capability. It provides precise 4–20 mA current outputs to control field devices such as valves, positioners, and actuators, while enabling digital HART communication for device configuration and diagnostics.
Q2: What are the output signal ranges supported by this module?
The module supports 0–20 mA and 4–20 mA output ranges. The output range is configurable via the module's configuration tags (RangeType: 1 = 0–20 mA; 2 = 4–20 mA).
Q3: What is the resolution and accuracy of the 1756-OF8IH?
The module offers 15-bit resolution across 24 mA (732 nA per bit). The calibrated accuracy is 0.15% at 4–20 mA, 25°C.
Q4: What is the load capability of this module?
The module can drive loads from 50 to 750 Ω with short circuit survival. The output short circuit protection electronically limits current to ≤21 mA with no damage.
Q5: Does the 1756-OF8IH support HART communication on all channels?
Yes. Each of the 8 channels has its own dedicated HART modem, enabling simultaneous HART communication on all channels. This allows configuration, calibration, and diagnostics of smart field devices without additional multiplexers.
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The Allen-Bradley 1756-OF8IH is an 8-channel isolated analog output module for the ControlLogix platform, featuring HART communication capability on every channel. This module provides precise 4–20 mA current outputs for controlling valves, positioners, and other field devices in process automation applications.
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