1771-OMD/B Allen-Bradley Digital Output Module

1771-OMD/B Allen-Bradley Digital Output Module | New & Original Stock

Availability: 20 left in stock

Allen-Bradley 1771-OMD/B 1771 PLC-5 I/O System Digital AC Output Module The Allen-Bradley 1771-OMD/B serves as the primary 1771-OMD Digital AC...

SKU: 1771-OMD B

Manufacturer: Allen Bradley
Product No.: 1771-OMD B
Product Type: Digital I/O Cards
Product Origin: USA
Payment:T/T, Western Union
Weight: 770g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Allen-Bradley 1771-OMD/B 1771 PLC-5 I/O System Digital AC Output Module

The Allen-Bradley 1771-OMD/B serves as the primary 1771-OMD Digital AC Output Module utilized to execute isolated AC switching functions across 1771 PLC-5 I/O System platforms.

Hardware Specifications

Parameter	Specification
Model	1771-OMD/B
Brand	Allen-Bradley
Origin	United States
Module Type	Digital AC Output Module
Output Channels	16 isolated outputs
Operating Voltage	184-250 VAC (Voltage Category: 220 VAC)
Max Continuous Current Per Output	2 A
Max Current Per Module	8 A
Backplane Current	700 mA at 5 VDC
Power Dissipation	7 W
Isolation Voltage	1500 VAC for 1 minute
Typical AC Signal Delay (Off)	45 +/- 15 ms
Typical DC Signal Delay (Off)	50 ms
Wiring Arm	1771-WH
Coating	Conformal Coat
Operating Temp	0 to 60 deg C
Storage Temp	-40 to 85 deg C
Humidity	5 to 95% non-condensing
Dimensions	178 x 50 x 180 mm
Weight	0.77 kg (1.69 lbs)

Profinet / EtherNet/IP Deterministic Networks and I/O Density Scaling

The 1771-OMD/B routes 16 independent output channels within a single slot footprint, optimizing I/O density scaling inside legacy 1771 chassis topologies. When interfacing with supervisory hardware across Profinet or EtherNet/IP deterministic networks, the backplane bus communication velocity remains stable due to the 700 mA current profile of the module. Conformal coating updates included in the Series B architecture preserve structural trace integrity, ensuring continuous firmware flash compatibility and predictable logic processing when high inductive loads are switched concurrently.

Frequently Asked Questions

Q: What is the maximum cumulative current limitation for the entire 1771-OMD/B module?

A: While individual channels can support a maximum continuous load of 2 A, the cumulative electrical current across all 16 channels must not exceed 8 A per module.

Q: Does the 1771-OMD/B module include internal short-circuit fuse protection for each channel?

A: No. The module does not contain internal per-channel fusing. External fusing is required for each channel path to safeguard the output triacs from overcurrent failures.

Q: Can the 1771-OMD/B be removed from the chassis while the backplane is energized?

A: No. Online removal or insertion under power is not supported by the 1771 chassis backplane architecture and can induce electrical damage or trigger processor faults.

Field Installation Guidelines

Wiring Arm Connection: Secure all field terminations to the 1771-WH wiring arm prior to latching the arm onto the module chassis pivot point.
Conductor Separation: Route AC output load lines through separate physical wire pathways from low-voltage DC analog signaling or communication cables to avoid inductive interference.
Inductive Load Suppression: Install external RC surge suppressors across connected AC inductive loads (such as solenoids or motor starter coils) to minimize voltage spikes during turn-off cycles.
Chassis Slot Grounding: Ensure the universal 1771 I/O chassis grounding strip is connected to an absolute low-impedance earth ground to verify 1500 VAC channel isolation performance.

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