Siemens 6AV3971-1PA03-1AA0 SIMATIC OP3

Name: Siemens 6AV3971-1PA03-1AA0 SIMATIC OP3
Brand: Siemens
SKU: 6AV3971-1PA03-1AA0
Price: 133.00 EUR
Availability: InStock

€ 133,00

Condition

Clear

SKU: 6AV3971-1PA03-1AA0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV3971-1PA03-1AA0 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 process visualization and parameter entry in industrial environments.

The OP3 features a 2-line LCD text display capable of showing alphanumeric characters, along with a membrane keypad for operator input. It communicates via the MPI (Multi-Point Interface) protocol, allowing direct integration with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using ProTool software and supports alarm display, recipe management, and simple process value visualization. Its compact housing and low power consumption make it suitable for panel-mounting in space-constrained control cabinets.

The SIMATIC OP3 is widely used in manufacturing, packaging, and process automation applications where a cost-effective, text-based HMI solution is required. It is particularly suited for small to medium-sized machines where full graphical displays are not necessary, such as conveyor systems, pumping stations, and simple process control panels. Its compatibility with the SIMATIC S7 controller family makes it a natural fit for Siemens-based automation architectures.

Technical Specifications

Display Type	LCD, 2-line text display
Display Characters	2 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4 W
Communication Interface	MPI (Multi-Point Interface)
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90%, non-condensing
IP Protection Rating (Front)	IP65
IP Protection Rating (Rear)	IP20
Mounting	Panel mounting
Configuration Software	ProTool
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 40000: Communication error between OP3 and connected PLC. The MPI connection has been interrupted or cannot be established.
Check MPI cable connections and termination resistors. Verify MPI address settings on both the OP3 and the PLC. Ensure the baud rate matches on all devices on the MPI network.
Event ID: 40010: PLC in STOP mode. The operator panel has detected that the connected controller is not in RUN state.
Switch the PLC to RUN mode. Check the PLC for program errors or hardware faults that may have caused it to enter STOP mode.
Event ID: 70010: Project data transfer error. A fault occurred during download of the configuration project to the OP3.
Restart the download process using ProTool. Check the PC-to-OP3 cable connection and verify that the correct COM port and transfer settings are configured in ProTool.
Event ID: 10000: System startup event. The OP3 has completed its internal self-test and is initializing communication.
No action required if the panel proceeds to normal operation. If the panel remains at this state, check the project configuration and MPI connection.
Event ID: 40003: MPI address conflict detected on the network. Two or more devices share the same MPI node address.
Assign unique MPI addresses to all devices on the MPI network. Reconfigure the OP3 address via the panel's start-up menu if necessary.
Event ID: 60000: No project loaded on the operator panel. The OP3 has no valid configuration project in its memory.
Download a valid ProTool project to the OP3 using the appropriate transfer cable and ProTool configuration software.
Event ID: 40020: Tag read/write error. The OP3 cannot read from or write to a configured PLC data address.
Verify that the PLC data block addresses and variable types configured in ProTool match the actual PLC program. Check for address range conflicts.

Frequently Asked Questions

Which PLCs are compatible with the SIMATIC OP3 (6AV3971-1PA03-1AA0)?

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 controllers using appropriate adapters and configuration.

What software is used to configure the OP3 panel?

The OP3 is configured using Siemens ProTool software. WinCC flexible is not supported for this panel generation; ProTool is the required engineering tool.

What is the supply voltage for the 6AV3971-1PA03-1AA0?

The OP3 operates on a 24 V DC supply voltage. Ensure the power supply is within the specified tolerance range to avoid operational issues.

What is the front panel protection rating of the OP3?

The front panel of the OP3 carries an IP65 protection rating, making it resistant to dust ingress and low-pressure water jets, suitable for industrial panel-mounting applications.

Can the OP3 display graphical content or images?

No, the OP3 is a text-based operator panel and supports only alphanumeric character display across its 2-line LCD. It does not support graphical or bitmap content.

Troubleshooting

Display remains blank after power is applied

Check the 24 V DC supply voltage at the power connector on the rear of the panel. Verify polarity and measure actual voltage with a multimeter.

Ensure the supply voltage is within the 24 V DC specification. Replace the power supply if voltage is absent or out of tolerance. If voltage is correct, the internal power supply board of the OP3 may be faulty and require repair or unit replacement.

OP3 displays a communication error and cannot connect to the PLC

Inspect the MPI cable for physical damage and verify that it is correctly seated at both the OP3 and PLC connectors. Check that MPI bus termination is active at both ends of the network.

Replace the MPI cable if damaged. Ensure only the two end devices on the MPI segment have termination resistors enabled. Confirm that the MPI address and baud rate configured on the OP3 match the PLC network settings.

Configuration project cannot be downloaded to the OP3

Verify the PC-to-OP3 transfer cable is correctly connected and that the OP3 is in transfer mode. Check the COM port settings in ProTool match the physical port in use.

Place the OP3 in transfer mode via its startup menu. Select the correct COM port and transfer speed in ProTool. If transfer still fails, try a different serial cable or USB-to-serial adapter, and ensure ProTool is installed correctly on the PC.

Operator keypad buttons are unresponsive or intermittent

Inspect the membrane keypad for physical damage, contamination, or deformation. Check the internal ribbon cable connection between the keypad and the main PCB if the unit is open for repair.

Clean the keypad surface with a dry cloth. If individual keys are permanently unresponsive, the membrane keypad assembly requires replacement. Re-seat the ribbon cable connector on the main board if the connection is loose.

OP3 repeatedly restarts or resets during operation

Monitor the 24 V DC supply voltage under load for voltage dips or instability. Check for excessive electrical noise on the supply line from nearby inverters or contactors.

Install a dedicated, regulated 24 V DC power supply for the OP3 if sharing with high-load devices. Add appropriate filtering or surge suppression on the supply line. If the unit continues to reset with a stable supply, the internal electronics may require inspection and repair.

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