Siemens 6AV6446-4AA40-1BY3 SIMATIC MP 370

SKU: 6AV6446-4AA40-1BY3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6446-4AA40-1BY3 is a Multi Panel (MP 370) belonging to the SIMATIC HMI family, designed for demanding machine-level and process visualization tasks. This panel features a 12-inch TFT display and is part of the SIMATIC MP 370 series, which offers high-performance operator interface capabilities for industrial automation environments. It is manufactured by Siemens and represents a robust, full-featured HMI solution within the SIMATIC product line.

The MP 370 (6AV6446-4AA40-1BY3) 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 runs on Windows CE and is powered by a 32-bit RISC processor, providing sufficient computing performance for complex visualization projects. The panel supports multiple communication interfaces including MPI, PROFIBUS DP, and Ethernet (TCP/IP), and includes a CompactFlash card slot for project storage and data logging. It offers compatibility with Siemens WinCC flexible engineering software for project configuration.

The SIMATIC MP 370 is widely used in machine building, automotive manufacturing, food and beverage processing, and general industrial automation applications. Its combination of touch operation, network connectivity, and Windows CE-based runtime environment makes it suitable for applications requiring real-time process monitoring, recipe management, alarm logging, and trend display. The panel is designed for panel mounting and is well suited to control cabinet integration in both standalone and networked SCADA architectures.

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
Operating System	Windows CE
Communication Interface	MPI, PROFIBUS DP, Ethernet (TCP/IP), RS-422/485
Memory	12 MB user memory (project); CompactFlash card slot
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), IP20 (rear)
Mounting	Panel mounting
Certifications	CE, UL, cULus
Series/Product Family	SIMATIC MP 370

Common Error Codes & System Events

Event ID: 10000: Communication error between HMI panel and PLC. Connection to the configured controller cannot be established or has been lost.
Check MPI/PROFIBUS or Ethernet cable connections and termination resistors. Verify PLC address settings match the HMI project configuration. Restart both the HMI and PLC if necessary.
Event ID: 10001: Tag read error. The HMI panel cannot read a configured tag from the connected controller.
Verify the tag address in WinCC flexible matches the actual PLC data block or memory address. Check that the PLC program is running and the relevant data areas are accessible.
Event ID: 10002: Tag write error. The HMI panel cannot write a value to the configured controller tag.
Check that the target PLC address is not write-protected. Verify the tag configuration in WinCC flexible and confirm the PLC is in RUN mode.
Event ID: 20000: Project download error. Transfer of the project from the engineering PC to the HMI panel failed.
Ensure the correct transfer cable or network connection is used. Verify that the HMI panel is in Transfer mode before initiating the download from WinCC flexible.
Event ID: 40000: System memory low. Available runtime memory on the panel is insufficient for the current project.
Reduce the project size by optimizing screens, reducing the number of tags, or clearing unnecessary data logs. Consider archiving data to the CompactFlash card.
Event ID: 50000: CompactFlash card error. The inserted CompactFlash card cannot be read or is not recognized by the panel.
Remove and reinsert the CompactFlash card. Format the card using the panel's Control Panel if necessary. Replace the card if the error persists.
Event ID: 70000: Alarm buffer overflow. The number of pending or unacknowledged alarms has exceeded the configured buffer limit.
Acknowledge and clear active alarms. Increase the alarm buffer size in the WinCC flexible project configuration if overflow occurs frequently.

Frequently Asked Questions

What communication interfaces does the 6AV6446-4AA40-1BY3 support?

The MP 370 supports MPI, PROFIBUS DP, Ethernet (TCP/IP via RJ45), and RS-422/485 serial interfaces, allowing connection to a wide range of Siemens PLCs and third-party controllers.

Which engineering software is used to configure this HMI panel?

The SIMATIC MP 370 is configured using Siemens WinCC flexible engineering software. Projects are created on a PC and then downloaded to the panel via Ethernet or MPI/PROFIBUS connection.

Is the 6AV6446-4AA40-1BY3 compatible with SIMATIC S7-300 and S7-400 PLCs?

Yes, the MP 370 is fully compatible with SIMATIC S7-300 and S7-400 PLCs via MPI or PROFIBUS DP, and can also communicate with S7-300/400 over Ethernet using the appropriate communication modules.

What is the operating voltage for this panel?

The panel operates on 24 V DC, which is the standard supply voltage for SIMATIC HMI panels and is typically provided by a dedicated 24 V DC power supply unit in the control cabinet.

Can the MP 370 store data logs and recipes on external media?

Yes, the panel includes a CompactFlash card slot that can be used for storing project data, data logs, alarm archives, and recipes, extending the internal storage capacity.

Troubleshooting

Display remains blank after power on

Check that 24 V DC is present at the power supply connector. Measure voltage at the panel terminals and inspect the supply cable for damage. Verify the internal fuse if accessible.

Restore correct 24 V DC supply. If voltage is present but the display remains off, the backlight or internal power board may be faulty and the panel may require repair or backlight replacement.

HMI panel fails to communicate with the PLC

Check the MPI or PROFIBUS cable connections and verify that bus termination resistors are correctly installed at both ends of the bus. Confirm that the PLC address configured in the HMI project matches the actual PLC station address.

Correct any wiring or termination issues. Update the PLC address in the WinCC flexible project if there is a mismatch, re-download the project, and restart both devices.

Touch screen does not respond or responds inaccurately

Check for physical damage or contamination on the touch surface. Access the Control Panel on the panel and run the touch screen calibration utility to determine if calibration has drifted.

Clean the touch surface with a soft, dry cloth. Recalibrate the touch screen via the Control Panel calibration tool. If the touch screen remains unresponsive after calibration, the touch overlay may need replacement.

Project cannot be transferred to the panel

Verify that the panel is set to Transfer mode (accessible via the Start Center or Control Panel). Check that the Ethernet or MPI connection between the engineering PC and the panel is active and correctly configured in WinCC flexible transfer settings.

Switch the panel to Transfer mode before initiating the download. Ensure IP addresses or MPI addresses are correctly configured on both the PC and the panel. Retry the transfer after correcting any network or address settings.

Panel repeatedly restarts or crashes during runtime

Check for project errors such as invalid tag addresses or script errors that may cause runtime exceptions. Monitor the panel temperature and ensure adequate ventilation around the unit.

Review and correct any project configuration errors in WinCC flexible and re-download the project. Ensure the panel is not exposed to temperatures exceeding 50 °C and that ventilation slots are not obstructed. If the issue persists, consider a factory reset and fresh project download.

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