Siemens 6AV3971-1NA03-0DA0 SIMATIC OP3

Name: Siemens 6AV3971-1NA03-0DA0 SIMATIC OP3
Brand: Siemens
SKU: 6AV3971-1NA03-0DA0
Price: 168.00 EUR
Availability: InStock

€ 168,00

Condition

Clear

SKU: 6AV3971-1NA03-0DA0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV3971-1NA03-0DA0 is an operator panel belonging to the SIMATIC OP3 series, manufactured by Siemens as part of its SIMATIC HMI product line. This compact text-based operator panel is designed for straightforward machine-level operator control and monitoring tasks. It provides a simple, robust interface for displaying process values and entering operator commands in industrial environments.

The OP3 features a 2-line LCD text display capable of showing alphanumeric characters, enabling operators to read status messages and process variables. It communicates via the MPI (Multi-Point Interface) protocol, allowing direct integration with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs. The unit is configured using ProTool software and supports a membrane keypad with function keys for operator input. It operates on a 24 V DC supply and is built to withstand the demands of industrial environments with an appropriate IP rating for front-panel mounting.

The SIMATIC OP3 is widely used in manufacturing, process automation, and machine building applications where a cost-effective, compact operator interface is required. It is particularly suited for small to medium-scale machinery where full graphical HMI capability is not necessary, such as conveyor systems, packaging machines, and simple process control panels. Its compatibility with the SIMATIC S7 PLC family makes it a natural fit for Siemens-based automation architectures.

Technical Specifications

Display Type	LCD text display
Display Lines	2 lines
Characters per Line	16 characters
Input/Operating Voltage	24 V DC
Communication Interface	MPI (Multi-Point Interface)
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Configuration Software	ProTool
Input Method	Membrane keypad with function keys
Mounting	Panel mounting (front-panel flush mount)
IP Rating (Front)	IP65
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 1: No connection to PLC – the operator panel cannot establish communication with the configured PLC.
Check MPI cable connections and termination resistors. Verify MPI address settings on both the OP3 and the PLC. Ensure the PLC is powered and in RUN or STOP mode.
Event ID: 2: Configuration error – the project loaded onto the OP3 is incompatible or corrupt.
Re-download the project from ProTool to the OP3. Verify that the correct PLC type and MPI address are configured in the project.
Event ID: 3: Tag read error – the panel is unable to read a configured PLC data tag.
Verify that the PLC address referenced in the tag configuration exists and is accessible. Check the PLC program for the correct data block or variable address.
Event ID: 4: Tag write error – the panel is unable to write a value to a configured PLC tag.
Check that the target PLC address is writable and not write-protected. Verify the data type and address range in the ProTool project configuration.
Event ID: 5: Operating system error – internal firmware or operating system fault detected on the OP3.
Perform a power cycle. If the error persists, reload the firmware and project using ProTool. Consider replacing the unit if the fault continues.
Event ID: 6: Transfer mode active – the panel is waiting for a project download from the configuration PC.
This is a normal operational state during commissioning. Connect the PC running ProTool and initiate the project transfer, or restart the panel to exit transfer mode if unintended.
Event ID: 7: Memory error – an error has been detected in the panel's internal memory during self-test.
Power cycle the device. If the error persists, reload the project. If the fault remains, the internal memory may be faulty and the unit should be repaired or replaced.

Frequently Asked Questions

Which PLCs are compatible with the SIMATIC OP3 (6AV3971-1NA03-0DA0)?

The OP3 is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via the MPI interface. It can also communicate with SIMATIC S5 PLCs using appropriate adapters and configuration.

What software is used to configure and program the OP3?

The OP3 is configured using Siemens ProTool software. Projects are created on a PC and downloaded to the panel via the MPI interface or a dedicated programming cable.

What is the supply voltage for the 6AV3971-1NA03-0DA0?

The OP3 operates on a 24 V DC supply voltage. Ensure the power supply is stable and within the specified tolerance range to avoid communication or display issues.

What is the IP protection rating of the OP3 front panel?

The front panel of the OP3 achieves IP65 protection when correctly installed in a panel cutout with the supplied sealing gasket, making it suitable for environments with dust and water spray.

Can the OP3 display graphical content or images?

No, the OP3 is a text-based operator panel and can only display alphanumeric characters on its 2-line LCD. For graphical HMI functionality, a higher-tier SIMATIC panel such as the TP177 or OP177 would be required.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the power connector. Verify that the supply is within the specified voltage range and that the connector is firmly seated.

Restore correct 24 V DC supply. If the supply is confirmed correct and the display remains blank, inspect the internal fuse and consider replacing the power supply or the unit itself.

OP3 cannot establish communication with the PLC

Verify the MPI cable is correctly connected and terminated. Check that the MPI address configured on the OP3 matches the project configuration and that no address conflicts exist on the MPI network.

Correct the MPI address settings via the panel's system menu. Replace the MPI cable if damaged. Ensure termination resistors are enabled only at the two physical ends of the MPI bus.

Project download from ProTool fails

Confirm the OP3 is in transfer mode. Check the MPI programming cable connection between the PC and the panel. Verify that the correct COM port and transfer settings are selected in ProTool.

Restart the OP3 and manually activate transfer mode. Try a different MPI cable or USB-to-MPI adapter. Reinstall the ProTool driver if the PC does not recognize the device.

Operator keys are unresponsive or intermittent

Inspect the membrane keypad for physical damage, contamination, or wear. Check the internal ribbon cable connection between the keypad membrane and the main PCB.

Clean the keypad surface with a dry cloth. If the ribbon cable is loose or damaged, reseat or replace it. If the membrane itself is worn, the keypad assembly should be replaced.

Panel repeatedly resets or reboots during operation

Monitor the 24 V DC supply for voltage dips or instability, especially under load. Check for excessive electrical noise or interference on the power supply line.

Install a regulated, noise-filtered 24 V DC power supply. Add appropriate surge protection or filtering to the supply line. If the hardware is faulty, the unit may require repair or replacement.

Condition	Repair, Used, Refurbished, New in box (sealed)