1756-OV32E | Allen-Bradley Controllogix 32 Point D/O Module

Product Summary

The Allen-Bradley 1756-OV32E is a 32-Point Electronically Fused DC Sinking Output Module for the ControlLogix platform. It provides 32 sinking outputs organized in two groups of 16, with electronic fusing per group for short-circuit protection. The module operates from 10–30V DC and is ideal for driving solenoids, contactors, indicator lamps, and other DC loads in high-density I/O applications.

Core Specifications

• Model Number: 1756-OV32E
• Type: 32-Point Electronically Fused DC Sinking Output Module
• Number of Outputs: 32 (2 groups of 16)
• Voltage Category: 12/24V DC sink
• Operating Voltage Range: 10–30V DC
• Output Delay Time: 75 µs min / 300 µs max (Off to On); 230 µs min / 1 ms max (On to Off)
• Backplane Current: 390 mA at 5.1V; 2 mA at 24V
• Total Backplane Power: 2.04 W
• Power Dissipation (Max): 5.88 W at 60°C
• Weight: 0.345 kg
• Manufacturer: Allen-Bradley by Rockwell Automation

Electrical & Functional Characteristics

• Current per Point (Max): 0.5 A at 50°C; 0.35 A at 60°C (linear derating)
• Current per Group (Max): 8 A at 50°C; 5 A at 60°C
• Current per Module (Max): 16 A at 50°C; 10 A at 60°C
• On-State Voltage Drop: 350 mV DC max at 0.5 A
• Off-State Leakage: 1 mA per point max
• Surge Current: 2 A for 10 ms per point, repeatable every 2 s
• Short Trip: 5 A for 20 ms at 24V DC
• Minimum Load Current: 2 mA per output
• Electronic Fusing: Per group (16 points); fuse-blown status reported to controller
• Scheduled Outputs: Synchronization within 16.7 ms max, referenced to Coordinated System Time (CST)
• Status Indicators: Output state LEDs; module and I/O status LEDs

System Integration & Compatibility

• Primary Platform: ControlLogix 1756 chassis
• Software: RSLogix 5000 / Studio 5000 Logix Designer
• Communication Formats: Output Data, Rack Optimization, Listen Only, CST Timestamped Fuse Data
• Configuration: Software-configurable; no physical DIP switches required
• Hot Swap: Supports removal and insertion under power (RIUP)
• Keying: Electronic keying prevents incorrect module insertion
• Removable Terminal Block: 1756-TBCH (cage-clamp) or 1756-TBS6H (spring-clamp), sold separately
• Related Parts: 1756-OV16E (16-point version), 1756-OB32 (32-point sourcing), 1756-OV32E-CC (conformal coated)

Environmental & Operational Limits

• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Storage Temperature: -40°C to +85°C (-40°F to 185°F)
• Humidity: 5% to 95% RH, non-condensing
• Vibration: 2G, 10 to 500 Hz
• Shock: 30G operating; 50G non-operating
• Isolation Voltage: 250V continuous (basic insulation), outputs-to-backplane and group-to-group
• Enclosure: Open-style (none)
• Temperature Code: T4
• Approvals: CE, UL, CUL

Industrial Applications

Widely deployed in material handling, packaging machinery, automotive assembly, food & beverage processing, water/wastewater treatment, and general manufacturing where high-density 24V DC sinking outputs for solenoids, relays, and indicator lamps are required.

Frequently Asked Questions

What is the difference between 1756-OV32E and 1756-OB32?

The 1756-OV32E is a sinking output module with electronic fusing (current flows into the module from the load). The 1756-OB32 is a sourcing output module (current flows out of the module to the load). Choose based on your load wiring configuration.

What does "electronically fused" mean?

Each group of 16 outputs has electronic overcurrent protection that trips on short circuit or overload. Fuse-blown status is reported to the controller via the backplane, and the e-fuse can be reset through software or by cycling output power.

What terminal block do I need?

The 1756-TBCH (36-pin cage-clamp) or 1756-TBS6H (36-pin spring-clamp) removable terminal block is required and sold separately.

Can I use this module for inductive loads?

Yes — the module is designed for DC inductive loads such as solenoids and contactor coils. Ensure proper flyback diode protection for high-inductance loads to prevent voltage spikes that may damage the output circuitry.

What are the related part numbers?

• 1756-OV16E — 16-point electronically fused sinking output
• 1756-OV32E — 32-point electronically fused sinking output (this part)
• 1756-OV32E-CC — Conformal coated version for harsh environments
• 1756-OB32 — 32-point sourcing output (non-fused)
• 1756-TBCH — 36-pin cage-clamp terminal block
• 1756-TBS6H — 36-pin spring-clamp terminal block