Brand:Allen Bradley PLC Item No.:1771-OMD/B Product Origin:USA Product Dimensions:165 x 51 x 89 mm Product Weight:0.748 kg Payment:T/T, Western Union, Credit Card Goods_stock:15 Shipping Port:Xiamen, China Lead Time:1-3 Days Condition:Brand New And Original Warranty:1 Year Certificate:COO
The Allen-Bradley 1771-OMD/B is a 16-point digital AC output module designed for PLC-5 and 1771 I/O rack systems. It provides reliable AC switching capability for controlling field devices such as actuators, relays, and signaling equipment in industrial automation environments.
Technical Specifications
Parameter
Specification
Product Model
1771-OMD/B
Product Type
Digital AC Output Module
System Compatibility
Allen-Bradley PLC-5 / 1771 I/O chassis
Output Channels
16 points
Output Voltage Range
184–250V AC
Output Technology
Triac solid-state switching
Load Type
AC relays, contactors, lamps, solenoids
Backplane Current
700 mA
Output Current
2 A per point (max), 8 A per module
Surge Current
Up to 25 A (short duration)
Mounting Type
1771 I/O rack system
Wiring Interface
1771 field wiring arm
Operating Environment
Industrial automation systems
Weight
0.748 kg
Dimensions
165 × 51 × 89 mm
Operating Temperature
0°C to 60°C
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Applications
• PLC-5 and 1771 I/O AC output control systems
Used to switch AC-powered field devices such as relays, contactors, indicator lamps, and solenoid valves in legacy industrial automation systems.
• Industrial machine sequencing and control
Applied in manufacturing equipment where multiple AC output signals are required for coordinated machine operations.
• Power generation and utility automation systems
Used for controlling auxiliary AC loads, alarms, and interlock circuits in plant and substation environments.
• Process control applications
Supports reliable switching of AC actuators and signaling devices in chemical, oil & gas, and continuous process industries.
• Remote I/O rack integration
Functions as part of 1771 distributed I/O chassis systems for large-scale control architectures.
• Legacy system maintenance and retrofit
Widely used for replacement or expansion of installed PLC-5 based automation systems.
Advantages
• 16-point high-density AC output design
Provides efficient control of multiple AC field devices within a single module.
• Wide industrial AC voltage range
Supports 184–250V AC switching for standard industrial loads.
• Robust triac-based switching
Ensures reliable solid-state switching performance for repetitive control operations.
• Fast response for discrete control
Delivers quick ON/OFF switching suitable for real-time automation tasks.
• Strong system compatibility
Fully integrates with Allen-Bradley 1771 PLC-5 I/O chassis architectures.
• Industrial-grade durability
Designed for long-term operation in electrically noisy and harsh environments.
Technical FAQs
Q1: What is the main function of the 1771-OMD/B module?
It provides 16 channels of AC digital outputs for controlling industrial field devices.
Q2: What voltage range does it support?
It operates within 184–250V AC.
Q3: How many output channels does it have?
It has 16 discrete AC output points.
Q4: What type of switching technology is used?
It uses triac-based solid-state switching.
Q5: What devices can it control?
It can control relays, contactors, lamps, and solenoid valves.
Q6: Is it suitable for inductive loads?
Yes, but external protection (snubber circuits) is recommended for heavy inductive loads.
Q7: Is it compatible with modern PLC systems?
It is mainly used in legacy PLC-5 and 1771 I/O systems.
Q8: What happens if one channel fails?
Only the affected output channel is lost; others continue operating normally.
Q9: Does it require a wiring arm?
Yes, it uses a dedicated 1771 series field wiring arm.
Q10: Is it still in production?
It is considered legacy hardware used primarily for maintenance and replacement.
