Siemens 6AV6446-3AA40-3BY4 SIMATIC MP 370

Name: Siemens 6AV6446-3AA40-3BY4 SIMATIC MP 370
Brand: Siemens
SKU: 6AV6446-3AA40-3BY4
Price: 2495.00 EUR
Availability: InStock

€ 2.495,00

Condition

Clear

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

Description
Additional information

The Siemens 6AV6446-3AA40-3BY4 is a Multi Panel (MP 370) belonging to the SIMATIC HMI family, designed for demanding machine-level and process visualization tasks. This unit features a 15-inch TFT display and is part of the SIMATIC MP 370 series, which represents a high-performance class of operator panels within Siemens' HMI portfolio. It is intended for use as a standalone operator interface or integrated into larger SIMATIC-based automation architectures.

The MP 370 panel is equipped with a high-resolution color TFT display with a resolution of 1024 x 768 pixels, supporting up to 65,536 colors for clear process visualization. It supports both touch and key operation variants; the 6AV6446-3AA40-3BY4 is the touch-screen version. Communication is facilitated via MPI, PROFIBUS DP, and Ethernet (TCP/IP) interfaces, enabling integration with SIMATIC S7 PLCs and other controllers. The panel runs WinCC flexible runtime software and provides ample memory for project data, trend displays, alarm logging, and recipe management.

The SIMATIC MP 370 is widely deployed in manufacturing, automotive, food and beverage, chemical, and water treatment industries. Its large display area and multi-protocol communication capability make it suitable for complex machine control panels, SCADA front-ends, and process monitoring stations where operators require detailed graphical overviews and real-time data interaction.

Technical Specifications

Display Size	15 inch
Display Resolution	1024 x 768 pixels (XGA)
Display Colors	65,536 colors
Display Type	TFT color LCD
Touch Technology	Resistive touchscreen
Operating Voltage	24 V DC
Power Consumption	Max. 60 W
Communication Interface	MPI, PROFIBUS DP, Ethernet (TCP/IP), RS-422/485
Operating System	Windows CE
Runtime Software	WinCC flexible Runtime
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
IP Rating (Front)	IP65
Mounting	Panel mounting
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 1000000: System startup completed successfully. The HMI device has booted and the runtime environment is initialized.
No action required. Verify that the project loads correctly and communication to the PLC is established.
Event ID: 1000002: Project transfer initiated. A project download from the engineering station has started.
Ensure the panel is in transfer mode and the correct communication interface is selected in WinCC flexible.
Event ID: 1000003: Connection to PLC lost. The HMI panel cannot establish or maintain communication with the configured controller.
Check MPI/PROFIBUS/Ethernet cabling and termination resistors. Verify PLC address settings match the HMI project configuration.
Event ID: 1000004: Tag read/write error. A configured variable could not be read from or written to the PLC.
Verify the PLC data block and address referenced in the HMI project exist and are accessible. Check PLC program for correct DB structure.
Event ID: 1000005: Alarm buffer overflow. The number of pending alarms has exceeded the configured alarm buffer capacity.
Acknowledge and clear existing alarms. Increase the alarm buffer size in the WinCC flexible project settings if overflow recurs frequently.
Event ID: 1000006: Recipe data error. A recipe record could not be read from or written to the configured storage location.
Check available storage memory on the panel. Verify recipe configuration in WinCC flexible and ensure the target storage medium is accessible.
Event ID: 1000007: Backup battery low. The internal backup battery voltage has dropped below the minimum threshold.
Replace the internal CMOS/RTC backup battery with the correct replacement type. Back up panel project data before replacement.
Event ID: 1000008: System memory low. Available runtime memory on the HMI device is critically low.
Reduce the complexity of the active project, limit the number of open trend displays or alarm logs, and restart the panel runtime.

Frequently Asked Questions

Which PLCs are compatible with the SIMATIC MP 370?

The MP 370 is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP, as well as S7 controllers via Ethernet TCP/IP. It also supports communication with SIMATIC S5 and third-party controllers via the RS-422/485 serial interface.

What software is used to create and download projects to the MP 370?

Projects for the MP 370 are created using Siemens WinCC flexible engineering software and transferred to the panel via Ethernet, MPI, or USB. The panel runs WinCC flexible Runtime on Windows CE.

What is the supply voltage for the 6AV6446-3AA40-3BY4?

The panel requires a 24 V DC power supply, typically within a tolerance range of 19.2 V DC to 28.8 V DC.

Is the MP 370 touch screen or key-operated?

The 6AV6446-3AA40-3BY4 variant is a touch-screen model with a resistive touchscreen. Separate key-operated variants of the MP 370 also exist within the product family.

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

The front panel of the MP 370 achieves IP65 protection, making it suitable for installation in environments where dust and water jets may be present.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the power connector. Check that the voltage is within the 19.2–28.8 V DC tolerance range. Inspect the internal fuse if accessible.

Correct the supply voltage if out of range. If voltage is correct and display remains blank, the backlight inverter or internal power supply board may require replacement.

HMI panel cannot communicate with the S7 PLC via MPI

Verify MPI cable connections and check that termination resistors are correctly placed at both ends of the MPI bus. Confirm that the MPI address configured in the HMI project matches the panel's actual MPI address.

Correct MPI address settings in WinCC flexible and re-download the project. Replace the MPI cable if continuity testing reveals a fault. Ensure only one active bus termination is present at each end.

Touchscreen does not respond or registers incorrect touch positions

Check whether the touchscreen calibration has drifted. Access the Windows CE control panel to run the touchscreen calibration utility. Inspect the screen surface for damage or contamination.

Recalibrate the touchscreen via the Windows CE system settings. Clean the screen surface with a soft, lint-free cloth. If calibration does not resolve the issue, the touchscreen overlay may need replacement.

Project fails to transfer from engineering PC to the panel

Confirm the panel is in transfer mode (accessible via the Start Center on boot). Verify the communication interface settings match between WinCC flexible and the panel. Check Ethernet or MPI cable integrity.

Set the correct transfer channel in WinCC flexible (Ethernet IP address or MPI address). Restart the panel into transfer mode via the Start Center. Replace the communication cable if a hardware fault is suspected.

Panel reboots unexpectedly or freezes during operation

Check the 24 V DC supply for voltage dips or ripple using an oscilloscope or multimeter. Review the system event log in WinCC flexible for recorded fault events prior to the reboot.

Stabilize the power supply by adding filtering capacitors or replacing the power supply unit. If the issue persists, reduce project complexity or check for corrupted project data and re-download a clean project version.

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