1756-OF6VI Allen-Bradley ControlLogix Iso A/O Voltage Module

Description

Allen-Bradley 1756-OF6VI: Precision Voltage Output Module for ControlLogix Systems

Rockwell Automation’s 1756-OF6VI delivers six individually isolated voltage outputs (±10VDC) for critical industrial automation. Designed for ControlLogix chassis integration, it ensures high accuracy and noise immunity in demanding environments like process control and motion systems. Its compact design simplifies integration while offering advanced diagnostics via RSLogix 5000 software

Core Specifications

• Brand: Allen-Bradley
• Model: 1756-OF6VI
• Series: ControlLogix
• Outputs: 6 channels, individually isolated
• Signal Range: ±10.5VDC
• Resolution: 14-bit (1.3mV)
• Accuracy: ±0.5% full scale
• Backplane Current: 250mA @ 5.1V DC, 175mA @ 24V DC
• Data Format: IEEE 32-bit floating point or integer
• Isolation: 250V AC (channel-to-backplane/channel-to-channel)
• Response Time: <2ms settling time

Technical Data

• Electrical: Output impedance <1Ω; Short-circuit/overvoltage (±24VDC) protected
• Environmental: 0°C to 60°C (operating), -40°C to 85°C (storage), 5–95% humidity non-condensing
• Mechanical: Vibration resistant (2g @ 10–500Hz); Shock resistant (30g operational)
• Terminals: Compatible with 1756-TBNH (screw clamp) or 1756-TBSH (spring clamp) removable blocks

Installation Guide

1. Power off the ControlLogix chassis.
2. Insert module into compatible slot; secure with upper/lower latches.
3. Attach 1756-TBNH/TBSH terminal block.
4. Connect wiring per drawing: Outputs 0–5 to terminals 0–11 (20-pin block).
5. Use shielded twisted-pair cables grounded at one end

Diagnostics & Maintenance

• LED Indicators: Module status (red/green), channel status (per point)
• Calibration: Required every 6 months for ±0.1% accuracy; use Rockwell calibration tools
• Software Monitoring: Configure alarms for over-range or fault via RSLogix 5000
• Thermal Management: Ensure ambient ≤60°C; max dissipation 4.85W

Industry Applications & Solutions

• Case 1: CNC Machine Tool
  Problem: Voltage drift causing positioning errors.
  Solution: Replaced non-isolated module with 1756-OF6VI. Eliminated ground loops – accuracy improved to 0.05mm
• Case 2: Chemical Dosing System
  Problem: Output noise corrupting valve signals.
  Solution: Enabled 14-bit filtering; used channel-specific grounding. Reduced valve jitter by 90%

Frequently Asked Questions (FAQ)

• Q: Is channel-to-channel isolation supported?
  A: Yes. All 6 outputs are fully isolated
• Q: What cable type is recommended?
  A: Shielded twisted-pair (e.g., Belden 8761) under 50m
• Q: Can it drive 4–20mA actuators?
  A: No. Use 1756-OF6CI for current output
• Q: How to troubleshoot “No Output” on one channel?
  A: 1) Verify wiring/terminal block seating. 2) Check software configuration. 3) Test with RSLinx force output

Shipping & Packaging

• Pack Includes: 1756-OF6VI module, label sheet
• Carriers: FedEx, UPS, DHL
• Warranty: 12 months from shipment date