New Allen Bradley 1756-OF8IH Isolated Analog Output Module

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FAQs

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.