Siemens 6ES7322-1HH01-0AA0 SIMATIC S7-300 SM 322 Digital Output Module 16x Relay

Ready-to-Rack Summary

• Part Number: 6ES7322-1HH01-0AA0 (16-Channel Relay Output, 5 A)
• Condition: Factory New Sealed in Original Siemens Packaging
• Warranty: 24 months (with full contact resistance & cycle test report)
• Availability: 24-hour worldwide dispatch from EU/US stock
• Channels: 16 potential-free relay contacts, 4 groups of 4

The Most Trusted Relay Card for S7-300 in 2025

Still the number-one choice when you need robust, potential-free switching of AC and DC loads up to 230 V / 5 A directly from the PLC rack. Plants love it because:

• True dry contacts – no voltage drop or polarity issues
• 5 A continuous per channel (real-world 8 A peak)
• LED per channel + group diagnostics in STEP 7
• Over 3.5 million units in service, fully supported in TIA Portal 18

Failure Symptoms Triggering Immediate Orders

Technicians buy this exact card when:

• “Relay output fault 16#E200” or single channel stuck ON/OFF
• Burnt smell or audible clicking from relay coil failure
• Diagnostic buffer shows “short-circuit to L+” after inductive kickback
• Manual override no longer works on channels 9–12 → 96% of faults resolved by hot-swap in <20 minutes

Real-World Deployments 2024–2025

• Oil & Gas: Shell refineries – 230 VAC valve actuators & motor starters
• Building Automation: Siemens Desigo systems – lighting & HVAC damper control
• Marine: Meyer Werft cruise ships – safety-critical door & pump relays

Technical Data Table

Compatibility

• Direct replacement for 6ES7322-1HH00-0AA0 and all earlier revisions
• Future path: ET 200SP RO 16x230VAC/5A (limited availability)