Siemens 6AV6446-4AA40-1AY3 SIMATIC MP 370

SKU: 6AV6446-4AA40-1AY3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6446-4AA40-1AY3 is a Multi Panel (MP 370) belonging to the SIMATIC HMI family, designed for demanding machine-level visualization and operator control tasks. This panel features a 15-inch TFT display and is part of the MP 370 series, which represents a high-performance tier within Siemens' panel-based HMI portfolio. It is intended for use as a standalone operator interface in industrial automation environments.

The MP 370 (6AV6446-4AA40-1AY3) is equipped with a touch-sensitive screen and supports a wide range of communication interfaces including PROFIBUS DP and MPI, enabling direct integration with Siemens S7-300 and S7-400 PLCs. The panel runs on Windows CE and is configured using Siemens WinCC flexible engineering software. It provides substantial onboard memory for project data and supports USB ports for data transfer and peripheral connectivity. The unit operates on 24 V DC supply voltage and is built to meet industrial environmental requirements.

The MP 370 is widely deployed in machine building, automotive manufacturing, process industries, and factory automation where a large, high-resolution display is required at the machine level. Its compatibility with the SIMATIC S7 controller family and support for PROFIBUS makes it well suited for integration into existing Siemens automation architectures. The robust construction and wide operating temperature range make it appropriate for installation in industrial control cabinets and panels.

Technical Specifications

Display Size	15 inch
Display Type	TFT color LCD
Display Colors	256 colors
Touch Technology	Resistive touch screen
Input/Operating Voltage	24 V DC
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
IP Rating (Rear)	IP20
Communication Interface	PROFIBUS DP, MPI, RS-232, USB
Operating System	Windows CE
Engineering Software	WinCC flexible
Mounting	Panel mounting
Series/Product Family	SIMATIC MP 370

Common Error Codes & System Events

Event ID: 1000: Connection to PLC lost or communication timeout on MPI/PROFIBUS interface.
Check cable connections and termination resistors on the PROFIBUS/MPI network. Verify PLC is powered and address settings match the project configuration.
Event ID: 1003: Tag read/write error — the HMI cannot access a configured PLC tag.
Verify the tag address in WinCC flexible matches the actual PLC data block or memory area. Check PLC program for address changes.
Event ID: 10000: Project download failed or project file is corrupt.
Re-transfer the project from the engineering PC using WinCC flexible. Ensure the correct panel type and firmware version are selected during transfer.
Event ID: 20000: System memory low — available RAM for runtime is insufficient.
Reduce project size by optimizing graphics and scripts. Delete unused project data from the panel memory.
Event ID: 40000: Firmware version mismatch between the panel and the loaded project.
Update the panel firmware to the version required by the WinCC flexible project, or recompile the project with the firmware version installed on the panel.
Event ID: 50000: Internal hardware fault detected during self-test at startup.
Perform a panel reset. If the fault persists, the panel may require repair or replacement of internal components.
Event ID: 70000: Backup battery low or discharged — real-time clock data may be lost.
Replace the internal backup battery with the correct type as specified in the MP 370 operating instructions.

Frequently Asked Questions

What PLC systems are compatible with the SIMATIC MP 370?

The MP 370 is compatible with Siemens S7-300, S7-400, and S7-200 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with third-party controllers via RS-232 using standard protocols.

What engineering software is required to configure the 6AV6446-4AA40-1AY3?

The panel is configured using Siemens WinCC flexible. The project must be compiled for the MP 370 panel type and transferred via Ethernet, USB, or serial connection.

What is the supply voltage for this panel?

The MP 370 operates on a 24 V DC supply voltage. Ensure the power supply can deliver sufficient current for stable operation.

Can the MP 370 be used with WinCC (full version) or only WinCC flexible?

The MP 370 is designed for use with WinCC flexible as its engineering tool. It is not compatible with the full WinCC SCADA software, which is intended for PC-based systems.

What is the front panel protection rating of the 6AV6446-4AA40-1AY3?

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

Troubleshooting

Display remains blank after power on

Check that 24 V DC is present at the power supply terminals. Verify the internal fuse and inspect the backlight. Measure voltage at the panel connector.

If supply voltage is correct but display remains blank, the backlight inverter or the display itself may have failed. A qualified repair technician should inspect and replace the backlight or display assembly.

Touch screen does not respond or responds inaccurately

Check for physical damage or contamination on the touch surface. Attempt a touch screen recalibration from the panel's Start Center or Control Panel menu.

Perform a touch screen calibration via the Windows CE Control Panel. If calibration does not resolve the issue, the resistive touch overlay may be worn or damaged and requires replacement.

Panel fails to establish communication with the PLC

Verify PROFIBUS or MPI cable connections, bus termination, and that the panel address configured in WinCC flexible matches the physical DIP switch or software address setting.

Correct any address mismatches in the WinCC flexible project. Replace damaged cables and ensure proper bus termination at both ends of the PROFIBUS segment.

Project cannot be downloaded to the panel

Check the transfer connection (USB, serial, or Ethernet). Ensure the panel is in Transfer mode via the Start Center and that the correct communication channel is selected in WinCC flexible.

Switch the panel to Transfer mode manually from the Start Center. Confirm the PC firewall is not blocking the transfer and that the correct COM port or network address is configured in the project settings.

Panel restarts repeatedly or freezes during operation

Check for power supply instability — measure 24 V DC under load. Inspect for overheating by verifying ambient temperature and ventilation around the panel.

Stabilize the power supply and ensure adequate ventilation. If the issue persists, reload the project firmware and project file. Persistent instability may indicate a failing internal power supply board requiring repair.

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