Siemens 6AV6446-3AA40-0BY4 MP 370

€ 2.995,00

SKU: 6AV6446-3AA40-0BY4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6446-3AA40-0BY4 is a Multi Panel (MP 370) belonging to the SIMATIC HMI Multi Panel series by Siemens. It is a high-performance operator panel designed for demanding machine-level and process visualization tasks, featuring a 12-inch TFT display. This unit operates under the WinCC flexible runtime environment and is intended for use as a standalone HMI or in networked automation architectures.

The MP 370 (6AV6446-3AA40-0BY4) is equipped with a 12.1-inch TFT color display with a resolution of 800 x 600 pixels (SVGA) and supports touch screen operation. It features a 32-bit RISC processor, providing sufficient computing power for complex visualization tasks. Communication interfaces include PROFIBUS DP, MPI, and Ethernet (TCP/IP), enabling integration with a wide range of Siemens SIMATIC S7 PLCs and third-party controllers. The panel runs on Windows CE and supports WinCC flexible for project engineering, with onboard flash memory and expansion via CompactFlash card.

The MP 370 is widely deployed in machine building, automotive manufacturing, food and beverage processing, and chemical plant environments. Its robust construction and broad communication capability make it suitable for applications requiring reliable real-time process visualization, recipe management, alarm logging, and trend display. The panel's compatibility with SIMATIC S7-300 and S7-400 PLCs makes it a common choice for mid- to large-scale automation systems.

Technical Specifications

Display Size	12.1 inch
Display Resolution	800 x 600 pixels (SVGA)
Display Colors	256 colors
Touch Technology	Resistive touch screen
Input/Operating Voltage	24 V DC
Power Consumption	Max. 30 W
Processor	32-bit RISC
Operating System	Windows CE
Communication Interface	PROFIBUS DP, MPI, Ethernet (TCP/IP)
Memory	12 MB onboard flash; expandable via CompactFlash
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
IP/Protection Rating	IP65 (front panel)
Mounting	Panel mounting
Certifications	CE, UL, cUL
Series/Product Family	SIMATIC HMI Multi Panel MP 370

Common Error Codes & System Events

Event ID: 1000: System startup completed successfully. The HMI panel has booted and the runtime environment is active.
No action required. Verify project loads correctly after startup.
Event ID: 10000: Connection to PLC lost. The configured communication link to the controller cannot be established or has been interrupted.
Check PROFIBUS/MPI/Ethernet cabling and connector integrity. Verify PLC is powered and communication parameters (address, baud rate) match the project configuration.
Event ID: 10001: Communication timeout. The HMI did not receive a response from the PLC within the configured timeout period.
Check network load and cable quality. Increase the communication timeout value in WinCC flexible project settings if necessary.
Event ID: 40000: Project download error. Transfer of the WinCC flexible project to the panel failed.
Verify USB or Ethernet transfer cable connection. Ensure the panel is in transfer mode and that the WinCC flexible version is compatible with the panel firmware.
Event ID: 20000: Tag read/write error. A configured tag could not be read from or written to the PLC.
Verify the PLC address and data block configuration. Check that the tag address in the WinCC flexible project matches the actual PLC memory layout.
Event ID: 50000: Insufficient memory. The panel's available runtime memory is critically low.
Reduce the number of active screens or objects. Archive or delete old alarm and data logs. Consider expanding storage via CompactFlash card.
Event ID: 70000: Firmware update failed. An error occurred during the panel firmware update process.
Restart the update process using ProSave. Ensure the correct firmware version for the MP 370 is used and that power supply is stable during the update.
Event ID: 30000: Alarm buffer overflow. The alarm log has exceeded its configured capacity.
Archive and clear the alarm buffer. Increase the alarm buffer size in the WinCC flexible project configuration if recurring overflow occurs.

Frequently Asked Questions

What PLC systems are compatible with the Siemens MP 370 (6AV6446-3AA40-0BY4)?

The MP 370 is primarily designed for use with Siemens SIMATIC S7-300 and S7-400 PLCs via MPI or PROFIBUS DP. It also supports Ethernet-based communication with S7 controllers and can connect to third-party controllers using supported drivers in WinCC flexible.

What software is required to program or configure this HMI panel?

The MP 370 is configured using Siemens WinCC flexible engineering software. The project is then transferred to the panel via USB, Ethernet, or MPI/PROFIBUS connection using the ProSave utility or directly from WinCC flexible.

Can the MP 370 be operated as a touch-only panel?

Yes, the 6AV6446-3AA40-0BY4 variant features a resistive touch screen and can be operated entirely via touch input. Some MP 370 variants also include a membrane keyboard, but this SKU is the touch-only version.

What is the maximum CompactFlash card size supported by the MP 370?

The MP 370 supports CompactFlash cards for extended storage of project data, recipes, and logs. Cards up to 1 GB are commonly supported; refer to the Siemens compatibility list for approved card types and sizes.

What is the front panel protection rating of the MP 370?

The front panel of the MP 370 carries an IP65 protection rating, making it resistant to dust ingress and low-pressure water jets, suitable for installation in industrial control cabinet doors.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the power connector. Check for correct polarity. Inspect the internal backlight fuse if accessible.

Ensure the 24 V DC supply is within tolerance (20.4–28.8 V DC). If supply is correct and display remains blank, the backlight inverter or display unit may require replacement.

HMI panel does not communicate with the PLC

Verify the communication cable type and wiring for MPI, PROFIBUS DP, or Ethernet. Check the bus address and baud rate settings on both the panel and the PLC. Use a bus diagnostic tool to check for bus conflicts.

Correct any address conflicts or baud rate mismatches in the WinCC flexible project and PLC configuration. Replace damaged cables or connectors. Ensure terminating resistors are correctly placed on PROFIBUS segments.

Touch screen does not respond or responds inaccurately

Check for physical damage or contamination on the touch surface. Attempt to recalibrate the touch screen via the panel's Control Panel settings in Windows CE.

Clean the touch surface with a soft, dry cloth. Recalibrate the touch screen using the calibration utility in the Windows CE Control Panel. If the issue persists, the touch screen overlay may need replacement.

Project fails to load or runtime crashes on startup

Check the CompactFlash card for errors or corruption. Verify that the WinCC flexible runtime version installed on the panel is compatible with the downloaded project version.

Reformat the CompactFlash card and re-download the project using WinCC flexible and ProSave. Update the panel firmware to the version required by the project if a version mismatch is identified.

Panel repeatedly reboots or freezes during operation

Monitor the 24 V DC supply for voltage drops or ripple under load. Check the operating environment temperature against the panel's rated range (0–50 °C). Review alarm logs for recurring system events.

Stabilize the power supply and ensure adequate ventilation around the panel. If overheating is suspected, improve cabinet cooling. If the issue persists after environmental factors are ruled out, the main board or power supply module may require replacement.

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