Product Core Brief

• Model: 3BDH000741R1 (CTI 21-P Ex)
• Brand: ABB
• Series: S800 I/O
• Integration Role: Provides isolated voltage measurement for ABB S800 I/O systems in process control applications.
• Product Type: Voltage Measurement Module
• Key Specs: High-precision voltage measurement | Wide measurement range | Industrial environmental stability
• Note: Condition: New Original (New Surplus)

Key Technical Specifications

• Product Type: Voltage Measurement Module
• Brand: ABB
• Model Number: 3BDH000741R1
• Series: S800 I/O
• Measurement Function: Voltage measurement
• Measurement Accuracy: High precision
• Measurement Range: Wide range (specify exact range per OEM datasheet)
• Operating Temperature: -20°C to +60°C
• Communication Interface: RS485
• Protection Rating: IP67
• Power Supply: 24V DC
• Max Current: 1A

Product Introduction

The ABB 3BDH000741R1 CTI 21-P Ex is a voltage measurement module designed for ABB S800 I/O systems. It delivers accurate voltage signal measurement in industrial process control environments, serving as a reliable analog input component for distributed control systems.

Engineers select this module for its measurement accuracy and stability in harsh industrial conditions. The unit supports wide-range voltage signal measurement and integrates directly into existing ABB S800 I/O racks without additional configuration overhead.

Firmware/Software Integration Notes

• Configuration Tool: ABB 800xA system engineering tool (exact version depends on your controller firmware).
• Compatibility: Verify module firmware compatibility with your AC800M controller firmware before deployment. Check the ABB S800 I/O compatibility matrix for your specific controller version.
• Upgrade/Downgrade Risk: No field firmware upgrade capability for this module type. Ensure the module firmware matches your system baseline before installation.
• GSD/Device Files: Module configuration data is handled through the 800xA engineering environment. No separate GSD file required for standard S800 I/O integration.
• Note: Always verify exact firmware requirements against your plant’s current ABB system version before procurement.

Integrator’s FAQ

Can I hot-swap this module in a live S800 rack? The S800 I/O system supports module replacement under certain conditions, but voltage measurement modules carry process signal risk. Before swapping, isolate the input signal and verify the backplane is properly grounded. Never pull or insert modules under load without confirming your system’s hot-swap configuration in the 800xA engineering tool. A misstep can trip the entire I/O segment.

Is this module still available, or is there a direct successor? The 3BDH000741R1 CTI 21-P Ex remains available through surplus and distribution channels. ABB has not published an official direct successor for this specific module variant. If your system is being upgraded to a newer I/O platform, consult ABB’s migration documentation for the equivalent module in the target series.

Will I lose configuration data when replacing this module? No. Configuration for S800 I/O modules resides in the controller, not on the module itself. When you replace the unit, the controller pushes the existing configuration to the new module automatically. However, always verify the module type matches the configured type in your engineering project before insertion to avoid a mismatch fault.

What warranty do you offer on New Surplus parts? We provide a full 12-month warranty on all New Original / New Surplus units. This is fundamentally different from refurbished parts, which often carry 30-90 day warranties and come with aged capacitors, unknown service history, and unpredictable field failure rates. New Surplus means the part was never installed — it carries the same reliability as factory-fresh stock at a significantly lower cost.

Why is your pricing lower than OEM direct but higher than used parts? Our pricing reflects New Original / New Surplus inventory sourced directly from factory overstock and authorized European distributors. You pay less than OEM list because these are surplus units, not current production. You pay more than used/refurbished because the part has zero operating hours, no capacitor aging, and no hidden wear. For critical process control, the cost of an unexpected shutdown from a failed refurbished module dwarfs any upfront savings.