ABB V18345-2020521501 Electro-Pneumatic Positioner | TZIDC with Profibus PA Specs

ABB V18345-2020521501 TZIDC positioner specifications. Profibus PA fieldbus, IP65, double-acting fail-freeze, with analog feedback. For process automation valve control.

ABB V18345-2020521501 Electro-Pneumatic Positioner

The ABB V18345-2020521501 is a TZIDC series electro-pneumatic positioner with Profibus PA fieldbus communication​ capability. This model features double-acting operation with fail-freeze (hold last position) functionality, includes analog position feedback, and is designed for integration into Profibus PA process automation networks. It provides digital communication for advanced diagnostics and configuration in modern DCS/PLC systems.

Key Features

• Profibus PA Communication:​ Digital fieldbus communication for integration with DCS/PLC systems.

• Double-Acting Operation:​ Designed for double-acting actuators with fail-freeze safety function.

• Analog Position Feedback:​ Standard 4-20mA position feedback signal for backup monitoring.

• Auto-Tuning:​ Microprocessor-based with automatic stroke adjustment.

• Robust Construction:​ IP65-rated aluminum housing suitable for industrial environments.

Technical Specifications

Model Number Decoding (V18345-2020521501)

• V18345:​ Series identifier for TZIDC positioners

• 2:​ Case/mounting type (2 = aluminum housing, IP65 - same as type 1)

• 0:​ Input/communication (0 = Profibus PA fieldbus​ - key difference)

• 2:​ Explosion protection (2 = without explosion protection - standard version)

• 0:​ Output/safe position (0 = double-acting, fail-freeze)

• 5:​ Connections (5 = cable thread M20x1.5, air pipe 1/4-18 NPT)

• 2:​ Option modules (2 = plug-in analog position feedback module)

• 1:​ Design (1 = standard)

• 5:​ Additional options (5 = specific configuration option)

• 0:​ Reserved

• 1:​ Reserved

Key Note on Position 2 (Input/Communication):​ The second digit "0" in this model number indicates Profibus PA fieldbus communication, which is the primary differentiator from previous 4-20mA HART models (which used digit "0" for 4-20mA+HART). This is a critical distinction in the TZIDC numbering system.

Key Differences from Previous Models

Compared to the previously discussed V18345 variants:

• V18345-2020521501:​ Profibus PA fieldbus​ + double-acting fail-freeze + analog feedback (this model)

• V18345-1010521001:​ 4-20mA HART + double-acting fail-freeze + analog feedback

• V18345-1027121001:​ ATEX + 4-20mA HART + double-acting fail-freeze + analog feedback

The 2020521501​ configuration is specifically designed for Profibus PA fieldbus networks, offering digital communication for modern process automation systems.

Typical Applications

• Process control valves in chemical and petrochemical plants with Profibus PA networks

• DCS/PLC systems requiring digital fieldbus communication

• Power generation facilities with fieldbus infrastructure

• Water and wastewater treatment systems with Profibus PA

• Applications requiring advanced diagnostics and remote configuration via fieldbus

Important Selection & Installation Notes

1. Fieldbus Network Requirement:​ This positioner requires a Profibus PA fieldbus network. It cannot be used with traditional 4-20mA analog control systems. Verify your control system compatibility.

2. Profibus PA Infrastructure:​ Requires Profibus PA segment coupler/repeater, proper termination, and configuration in the DCS/PLC system.

3. Address Configuration:​ Each positioner on the Profibus PA network requires a unique station address (set via DIP switches or software).

4. Actuator Compatibility:​ Designed for double-acting actuators only. Verify your actuator type before selection.

5. Fail-Freeze Function:​ On signal/power loss, the valve holds its last position. Ensure this meets your process safety requirements.

6. Position Feedback:​ The analog feedback provides a 4-20mA backup signal, but primary control is via Profibus PA digital communication.

7. Configuration:​ Requires configuration using Profibus PA configuration tools or ABB fieldbus configuration software.

8. Wiring:​ Use Profibus PA certified cable and follow fieldbus installation guidelines for proper network performance.

Note: Specifications are based on the TZIDC series data and model number decoding conventions. The exact configuration for this specific model number includes Profibus PA communication, double-acting operation, fail-freeze function, and analog position feedback. For complete technical data, dimensional drawings, and Profibus PA installation guidelines, consult the official ABB TZIDC Positioner Technical Manual​ or contact ABB technical support.