Product Overview

The Allen-Bradley 1756-OB16IEFS is a fast digital output module for ControlLogix systems. This module has 16 scheduled high-speed outputs. Each output has individual isolation and electronic fuses (e-fuse). This is the only module that works with the MAOC (Motion Axis Output Cam) instruction in remote chassis. It receives output data while performing this function. The module uses CIP Sync for scheduling and timestamps.

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Part Number Breakdown (Tree Structure)

• 1756 → Series Family
  • ControlLogix platform
  • Allen-Bradley / Rockwell Automation
• OB → Product Type
  • Digital Output Module
  • DC voltage type
• 16 → Channel Count
  • 16 output channels
• IEFS → Special Features
  • Isolated outputs
  • E-Fuse (electronic protection)
  • Fast scheduled outputs
  • Position-based output control

Key Specifications

• Brand: Allen-Bradley / Rockwell Automation
• Part Number: Allen-Bradley 1756-OB16IEFS
• Series: ControlLogix
• Module Type: DC Output Module
• Number of Outputs: 16 channels
• Circuit Type: DC (sink/source)
• Voltage Category: 12/24V DC
• Enclosure: None (open-style)

Voltage and Current Ratings

• Input Voltage Range: 10 to 30 Volts DC
• Operating Voltage Range: 10 to 30 Volts DC
• Current per Point at 30°C: 2 Amps (4 channels max)
• Current per Point at 60°C: 1 Amp
• Current per Module at 30°C: 8 Amps
• Current per Module at 60°C: 4 Amps
• Module Total Current at 60°C: 16 Amps (1A per channel)
• Minimum Load Current: 1 mA per point
• Inrush Pilot Duty: 4 Amps
• Surge Current: 4 Amps for 10 ms (repeat every 2 seconds)
• Maximum On-State Voltage Drop: 0.4 V DC at 2A, 0.2 V DC at 1A
• Maximum Off-State Leakage: < 0.1 mA per point

Power and Backplane

• Backplane Current (5 Volts): 350 milliamps
• Backplane Current (24 Volts): 3 milliamps
• Power Dissipation (Max at 60°C): 3.6 Watts
• Total Backplane Power: 1.7 Watts
• Continuous Isolation Voltage: 250V

Isolation and Protection

• Isolation Voltage: 50 Volts continuous (basic)
• Continuous Isolation (Field to Backplane): 250V
• Individual Output Isolation: Yes, each channel isolated
• Electronic Fuse (e-Fuse): Per channel protection
• Fuses reset automatically after overload clears.

Scheduling and Timing

• Minimum Schedule Interval: 5 microseconds
• Unscheduled Output Delay (Off to On): 14 µs nominal, 23 µs max
• Unscheduled Output Delay (On to Off): 14 µs nominal, 23 µs max
• Module provides time-scheduled output control for outputs 0 to 15.
• Scheduling uses CIP Sync Time for precision.
• Outputs 0 to 15 can have independent schedules.

Pulse Width Modulation (PWM) Capabilities

• PWM Cycle Time Minimum: 1 ms
• PWM Cycle Time Maximum: 1 hour
• PWM On Time Minimum: 200 µs
• PWM On Time Maximum: 1 hour
• PWM On-Time Accuracy: ± 20 µs

Compatible Removable Terminal Blocks (RTB)

• 1756-TBCH
• 1756-TBS6H
• Module requires RTB for field wiring connections.

Configurable Fault and Program Modes

Fault Mode Settings (per output):

• Hold Last State
• On
• Off (default)

Fault Mode Duration:

• 1 second
• 2 seconds
• 5 seconds
• 10 seconds
• Forever (default)

Final State After Fault Mode Duration:

• On
• Off

Program Mode Settings (per output):

• Hold Last State
• On
• Off (default)

MAOC Instruction Compatibility

• This is the only module that works with MAOC instruction in remote chassis.
• It receives output data while performing MAOC function.
• Use for position-based output control applications.
• Ideal for electronic camming and registration control.

CIP Sync Features

• Module is a CIP Sync slave-only device.
• Uses CIP Sync for scheduling and timestamps.
• Requires a CIP Sync time master on the network.
• Provides precise coordinated output timing.

Installation Guide

• Turn off all power before installation.
• Install removable terminal block (1756-TBCH or 1756-TBS6H) first.
• Insert the Allen-Bradley 1756-OB16IEFS into any ControlLogix chassis slot.
• Press firmly until the module seats in backplane.
• Secure the module with retaining screws.
• Connect field devices to RTB terminals.
• Apply 10-30V DC power to outputs.
• Apply backplane power and check module status.
• Configure output schedules using Studio 5000 software.
• Test each output before connecting to field devices.

Maintenance Tips

• Check LED indicators for each output channel.
• Monitor e-fuse status after overload events.
• Verify operating temperature stays below 60°C.
• Reduce load current at higher ambient temperatures.
• Inspect RTB connections for tightness annually.
• Replace module if outputs fail repeatedly.

Troubleshooting Tips

• If output does not turn on, check e-fuse status.
• Check output load current (do not exceed 2A at 30°C).
• Verify supply voltage is between 10-30V DC.
• Check CIP Sync time master is present on network.
• Verify MAOC instruction configuration for scheduled outputs.
• Use Studio 5000 to view module fault codes.

Typical Applications

• Electronic camming and gearing systems
• Rotary knife and cut-to-length applications
• Registration control for printing presses
• Position-based output control with MAOC instruction
• High-speed packaging machinery
• Flying shear and material handling
• Precision timing and scheduling applications

Package Contents

• One Allen-Bradley 1756-OB16IEFS output module
• Removable terminal block not included (order separately)
• One product label

Warranty and Shipping

• 12 months factory warranty from shipment date.
• Warranty covers manufacturing defects only.
• Overload or short circuit voids warranty.
• Shipping options: FedEx, UPS, DHL.
• Tracking number provided after shipment.

Frequently Asked Questions (FAQ)

Q1: What makes the 1756-OB16IEFS different from other output modules?

The Allen-Bradley 1756-OB16IEFS is the only module that works with MAOC instruction in remote chassis. It has 16 individually isolated outputs with electronic fusing. It also supports scheduling with 5 microsecond minimum intervals.

Q2: What is the maximum current per output?

Maximum current is 2 Amps at 30°C (4 channels max). At 60°C, maximum is 1 Amp per output. Module total is 8 Amps at 30°C and 4 Amps at 60°C. Derating is required at higher temperatures.

Q3: What RTB works with this module?

Use 1756-TBCH or 1756-TBS6H removable terminal block. The module requires an RTB for field wiring. Order the RTB separately if you do not have one.

Q4: Does this module support CIP Sync?

Yes, this module is a CIP Sync slave-only device. It uses CIP Sync for scheduling and timestamps. A CIP Sync time master must exist on the network for scheduled operations.

Q5: What happens when an output overloads?

The electronic fuse (e-fuse) protects the output channel. The output shuts off when overload occurs. The fuse resets automatically after the overload clears. No physical fuse replacement is needed.

Buying Guide

When you buy a Allen-Bradley 1756-OB16IEFS output module, follow these tips. First, verify your application needs MAOC instruction. This module is unique for position-based control. Second, count your output channels. This module gives 16 outputs. Third, check your current requirements. Maximum is 2A per point at 30°C. Fourth, consider your ambient temperature. Derating applies above 30°C. Fifth, order the correct RTB. Choose 1756-TBCH or 1756-TBS6H. Sixth, verify your network has CIP Sync time master. Seventh, plan your schedule timing. Minimum interval is 5 microseconds. Eighth, configure fault and program mode behaviors. Ninth, review warranty terms. We offer 12 months coverage. Tenth, choose your shipping method. We use FedEx, UPS, and DHL. Finally, test scheduled outputs with a scope before connecting to field equipment.

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