Siemens 6AV6321-1BA34-0MY0 SIMATIC OP 321

Name: Siemens 6AV6321-1BA34-0MY0 SIMATIC OP 321
Brand: Siemens
SKU: 6AV6321-1BA34-0MY0
Price: 1995.00 EUR
Availability: InStock

€ 1.995,00

Condition

Clear

SKU: 6AV6321-1BA34-0MY0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6321-1BA34-0MY0 is an operator panel (OP) belonging to the SIMATIC HMI family, designed for human-machine interface applications in industrial automation environments. This unit provides a compact, key-operated interface for process visualization and machine control, enabling operators to monitor and interact with automated systems. It is part of Siemens' established SIMATIC HMI portfolio, which is widely deployed across manufacturing and process industries.

The OP 321 panel features a monochrome display with a matrix of function keys and system keys, allowing structured navigation and data entry without a touchscreen. It supports MPI and PROFIBUS DP communication interfaces for direct integration with Siemens SIMATIC S7 PLCs, and is configured using Siemens ProTool or WinCC flexible engineering software. The unit operates on a 24 V DC supply and is built to withstand typical industrial environments, with a front panel protection rating suitable for panel mounting applications.

This operator panel is commonly used in machine building, automotive production lines, packaging machinery, and general factory automation where a robust, key-based HMI interface is preferred over touchscreen solutions. Its compatibility with the S7-300 and S7-400 PLC families makes it a practical choice for system integrators working within the Siemens SIMATIC ecosystem. The compact form factor allows installation in control cabinets and machine panels with limited front-panel space.

Technical Specifications

Display Type	Monochrome LCD
Input Voltage	24 V DC
Communication Interface	MPI, PROFIBUS DP
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Protection Rating (Front)	IP 65
Protection Rating (Rear)	IP 20
Mounting	Panel mounting
Configuration Software	ProTool, WinCC flexible
PLC Compatibility	SIMATIC S7-300, S7-400
Series	SIMATIC HMI OP
Certifications	CE, UL

Common Error Codes and System Events

Event ID: 1000: Connection to PLC lost or communication timeout on MPI/PROFIBUS DP interface.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify PLC is powered and running. Check configured station address matches PLC settings.
Event ID: 1003: No connection to configured PLC partner; project configuration mismatch.
Verify the PLC address and network settings in the ProTool or WinCC flexible project. Re-download the project to the OP and confirm PLC program is active.
Event ID: 10000: System startup error; operating system or firmware could not be loaded correctly.
Perform a memory reset on the panel. Re-transfer the project and OS update using ProTool or WinCC flexible. Check power supply stability.
Event ID: 10001: Project transfer error; data transfer from engineering PC to panel was interrupted or failed.
Check the transfer cable and PC interface settings. Restart the panel in transfer mode and retry the project download.
Event ID: 40000: Internal device error detected during self-test at startup.
Cycle power to the panel. If the error persists, perform a factory reset. Contact Siemens technical support or arrange for unit repair if fault recurs.
Event ID: 10006: Insufficient memory to load the configured project.
Reduce the project size by removing unused screens or tags. Ensure the project is compiled for the correct OP 321 target device in the engineering software.

Frequently Asked Questions

Which communication interfaces does the 6AV6321-1BA34-0MY0 support?

The OP 321 supports MPI and PROFIBUS DP interfaces, allowing direct connection to Siemens SIMATIC S7-300 and S7-400 PLCs without additional communication modules.

Which engineering software is used to configure this operator panel?

The panel is configured using Siemens ProTool or WinCC flexible. The project is then transferred to the panel via the MPI interface or a dedicated transfer cable.

What is the supply voltage for the 6AV6321-1BA34-0MY0?

The unit operates on a 24 V DC supply voltage, which is standard for SIMATIC HMI operator panels in this series.

Is the OP 321 compatible with S7-1200 or S7-1500 PLCs?

The OP 321 is primarily designed for use with S7-300 and S7-400 PLCs via MPI or PROFIBUS DP. Compatibility with S7-1200 or S7-1500 is limited, as those platforms are optimized for newer HMI devices using PROFINET.

What is the front panel protection rating of this unit?

The front panel of the OP 321 carries an IP 65 protection rating, making it suitable for panel mounting in environments where dust and water spray may be present.

Troubleshooting

Panel display remains blank after power is applied

Measure the 24 V DC supply voltage at the power connector. Check for blown internal fuse. Verify the power supply can deliver sufficient current for the panel.

Ensure the 24 V DC supply is stable and within tolerance. Replace the internal fuse if blown. If the display remains blank with correct supply voltage, the internal power supply or display unit may require replacement.

No communication with the S7 PLC over MPI or PROFIBUS DP

Check the physical cable connections and verify that bus termination resistors are correctly placed at both ends of the network. Confirm the station address configured in the panel project matches the PLC address.

Replace or reseat the MPI/PROFIBUS DP cable. Correct the station address in the WinCC flexible or ProTool project and re-download. Ensure only one active bus termination exists at each network end.

Project transfer from PC to panel fails or times out

Verify the transfer cable type and PC interface settings. Confirm the panel is set to transfer mode before initiating the download from the engineering software.

Set the panel to transfer mode via the start center menu. Use the correct MPI transfer cable and ensure the PC COM port or USB-MPI adapter is correctly configured. Retry the transfer at a lower baud rate if errors persist.

Function keys do not respond or produce incorrect inputs

Test each key individually in the panel's diagnostic or key test mode if available. Inspect the keypad membrane for physical damage or contamination beneath the keys.

Clean the keypad area. If individual keys are unresponsive, the keypad membrane assembly may need replacement. Arrange for panel refurbishment if multiple keys are affected.

Panel repeatedly restarts or shows startup errors after project download

Check that the project was compiled for the correct target device (OP 321) in the engineering software. Verify available panel memory is sufficient for the project size.

Recompile the project ensuring the correct device type is selected. Reduce project size if memory is insufficient. Perform a memory reset on the panel before re-transferring the project.

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