Allen-Bradley 1756-OH8I Digital Output Module

Series#: AllenBradley

Product Details

1756-OH8I Allen-Bradley ControlLogix 8-Channel Isolated Output Module – designed for high-integrity industrial control.
Provides 8 isolated digital output points, each with individual channel-to-channel isolation up to 250V AC/DC.
Supports 24V DC sourcing outputs with 2A per point (8A per module) for demanding actuator and relay loads.
Hot-swappable under power (RIUP) in ControlLogix chassis, minimizing system downtime.
Built-in diagnostic LEDs for output status, fault, and module health – simplifies troubleshooting.
Compatible with 1756-EN2T, 1756-L7x, and all ControlLogix 5580 controllers – seamless integration.
100% Original product. We provide efficient, traceable, and secure global shipping solutions.

Specification

The 1756-OH8I from Allen-Bradley is a high-performance 8-channel isolated digital output module within the ControlLogix platform. Engineered for environments requiring galvanic separation between outputs, this module delivers robust sourcing outputs at 24V DC, with each channel individually isolated to prevent ground loops and cross-talk. Ideal for driving solenoids, contactors, and indicator lights in harsh industrial settings, the 1756-OH8I supports hot-swap replacement under power (RIUP) and provides real-time diagnostics via front-panel LEDs. Its compact form factor fits any ControlLogix chassis, and it operates reliably across -20°C to +60°C. Below is the detailed technical specification table based on standard Allen-Bradley documentation.

Specification	Value
Module Type	Digital DC Output Module, Isolated
Output Channels	8 (sourcing, isolated per channel)
Output Voltage Range	10-30V DC (rated 24V DC nominal)
Output Current per Point	2 A maximum at 30°C, derated to 1.5 A at 60°C
Output Current per Module	8 A maximum (total)
Channel-to-Channel Isolation	250V AC/DC continuous (basic insulation)
Output Type	Solid-state (MOSFET), short-circuit protected
Fuse Protection	External fusing recommended (per channel)
Load Type	Resistive, inductive (with suppression diode)
Off-State Leakage Current	< 0.5 mA at 24V DC
On-State Voltage Drop	< 1.5 V at 2 A
Response Time (Off to On)	< 1 ms (resistive load)
Response Time (On to Off)	< 1 ms (resistive load)
Power Supply Requirement (Backplane)	5V DC at 150 mA (typical), 24V DC at 30 mA (field power)
Field Power Supply	10-30V DC, 1 A minimum per module
Indicators	8 green/red LEDs for output status, 1 green/red module status LED
Hot-Swap (RIUP)	Yes, under power (ControlLogix chassis)
Operating Temperature	-20°C to +60°C (non-condensing)
Storage Temperature	-40°C to +85°C
Relative Humidity	5% to 95% (non-condensing)
Vibration Resistance	5 g Standard Models 10-500 Hz (operating)
Shock Resistance	30 g (operating)
Dimensions (H x W x D)	144 mm x 35 mm x 105 mm (approx.)
Weight	0.25 kg (0.55 lb)
Enclosure Type	Open-style (IP20 rated when installed in chassis)
Certifications	UL, CE, cUL, ATEX (Zone 2), IECEx (Zone 2)
Wiring	Removable terminal block (1756-TBCH or 1756-TBS6H)
Compatibility	ControlLogix 1756 chassis (all versions)
Warranty	Standard 2-year factory warranty