1756-OF8 Allen Bradley Rockwell Analog Output Module

Product Parameters

Basic Information:

Manufacturer: Allen-Bradley (Rockwell Automation)

Model: 1756-OF8 (Series A, B, etc.)

Type: Analog Output Module

Compatible Systems: ControlLogix series (PLC-5 compatible with appropriate adapters)

Installation: Occupies one slot in a 1756 ControlLogix chassis, suitable for local or distributed I/O configurations

Module Location: Can be installed in any slot of the ControlLogix chassis

Electrical Parameters:

Output Channels: 8 single-ended analog outputs

Output Signal Ranges:

Voltage: ±10V DC

Current: 0–20 mA (also supports 4–20 mA)

Resolution:

Voltage: 15 bits across 10.4V (320 µV/bit)

Current: 15 bits across 21 mA (650 nA/bit)

Backplane Current:

150 mA @ 5.1V DC

210 mA @ 24V DC

Power Consumption: 5.8 W (maximum)

Power Dissipation: 4.9 W (maximum)

Thermal Dissipation: 16.71 BTU/hour (maximum)

Output Impedance:

Voltage: <1 Ω

Current: >1 MΩ

Drive Capability:

Voltage: 2000 Ω (minimum load)

Current: 0–700 Ω

Calibration Interval: Recommended every 12 months

Module Error:

Voltage: 0.15%

Current: 0.3%

Offset Drift: 50 ppm/°C (voltage), 0.1 ppm/°C (current)

Gain Drift: 25 ppm/°C (voltage), 50 ppm/°C (current)

Overvoltage Protection: 24V DC (current mode)

Short-Circuit Protection: Electronically limited to 21 mA or less (current mode)

Isolation Voltage: 250V AC continuous, tested at 1350V AC for 2 seconds (reinforced insulation between outputs and backplane)

Connection and Wiring:

Removable Terminal Blocks (RTBs):

1756-TBNH: 20-position NEMA screw clamp block

1756-TBSH: 20-pin spring clamp block

Wire Size:

1756-TBNH: 0.33–2.1 mm² (22–14 AWG) solid or stranded copper wire, rated at 105°C (221°F) or greater, 1.2 mm insulation max (single or double wire connection)

1756-TBSH: 0.33–2.1 mm² (22–14 AWG) solid or stranded shielded copper wire, rated at 105°C (221°F) or greater, 1.2 mm insulation max (single wire only)

Torque: 1.36 Nm (12 lb-in) for 1756-TBNH

Environmental Specifications:

Operating Temperature: 0°C to 60°C (32°F to 140°F)

Storage Temperature: -40°C to 85°C (-40°F to 185°F)

Relative Humidity: 5% to 95% (non-condensing)

Vibration: 2G @ 10–500 Hz

Shock: 30G (operating)

Enclosure Type: Open-type

Temperature Codes: T4A (North America), T4 (IEC, ATEX)

Other:

Conversion Method: R-Ladder DAC, monotonicity with no missing codes

Data Formats: Integer (left-justified, 2’s complement), IEEE 32-bit floating point

Scan Time:

Integer format: 8 ms

Floating point format: 12 ms

Certifications: UL, CSA, CE, C-TICK, ATEX, FM, KC, IECEx, ABS

Weight: Approximately 0.3 kg (0.66 lbs)

Functions

Analog Output Control:

Provides 8 single-ended analog output channels configurable for ±10V DC or 0–20 mA (commonly 4–20 mA), enabling precise control of analog devices like valves, actuators, or variable frequency drives (VFDs).

High-Resolution Output:

Offers 15-bit resolution for both voltage (320 µV/bit) and current (650 nA/bit), ensuring high precision for fine-tuned control applications.

Protection Features:

Overvoltage Protection: Protects against 24V DC overvoltage in current mode.

Short-Circuit Protection: Electronically limits current to 21 mA or less to prevent damage.

Open-Circuit Detection: Detects open circuits in current mode, enhancing system reliability.

Flexible Data Handling:

Supports Integer and IEEE 32-bit floating point data formats for compatibility with various control algorithms.

Uses R-Ladder DAC for accurate and monotonic signal conversion.

System Integration:

Integrates seamlessly with ControlLogix controllers via ControlNet, EtherNet/IP, or DeviceNet networks.

Supports local or distributed I/O configurations, making it versatile for centralized or remote control systems.

Diagnostics and Monitoring:

Provides real-time channel sampling and onboard data alarming for immediate detection of faults.

Compatible with Studio 5000 Logix Designer for easy configuration and diagnostics.

Modular Design:

Supports Removal and Insertion Under Power (RIUP) with removable terminal blocks (1756-TBNH, 1756-TBSH), simplifying maintenance and reducing downtime.

Application Scenarios

Industrial Process Control:

Used to control analog devices like valves, pumps, or actuators in industries such as chemical processing, oil and gas, or water treatment.

Ideal for applications requiring precise modulation, such as flow control, pressure regulation, or temperature adjustment.

Manufacturing Automation:

Drives variable frequency drives (VFDs) or servo motors in automated production lines, such as automotive manufacturing, packaging systems, or material handling.

Enables precise control of conveyor speeds, robotic arms, or other motion control systems.

Signal Transmission:

Re-transmits analog signals (e.g., 4–20 mA) to interface with external measuring or recording instruments, such as SCADA systems or data loggers.

Distributed Control Systems:

Deployed in distributed I/O setups via ControlNet or EtherNet/IP networks, allowing centralized control of remote analog devices in large-scale facilities like power plants or refineries.

Legacy System Upgrades:

Supports integration with existing PLC-5 systems (via adapters) or serves as a key component in modernizing to ControlLogix platforms, maintaining compatibility with legacy infrastructure.

Harsh Environment Applications:

Robust design with vibration resistance (2G) and shock resistance (30G) makes it suitable for demanding environments, such as mining or heavy machinery control.

Advantage Products:

All items are Distributor Ready-stock Genuine Brand-new Supplying, please inform us if the other conditions are needed, Used, Open-box, Refurbished, etc.

Many Available just wait for you, feel free to ask to get better deal!!!

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