Siemens 6AV6446-1AA40-1AB3 SIMATIC MP 370

SKU: 6AV6446-1AA40-1AB3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6446-1AA40-1AB3 is a Multi Panel (MP 370) belonging to the SIMATIC HMI product family, designed for demanding machine-level and process visualization tasks. This panel is part of Siemens' high-performance operator panel range, offering a 12-inch TFT display with touch and key operation capability. It is intended for use as a human-machine interface in industrial automation environments controlled by Siemens SIMATIC PLCs and compatible controllers.

The MP 370 features a 12.1-inch TFT color display with a resolution of 800 x 600 pixels (SVGA) and supports 256 colors. It is equipped with MPI, PROFIBUS DP, and Ethernet (TCP/IP) communication interfaces, enabling flexible integration into various network architectures. The panel runs on WinCC flexible runtime software and provides substantial onboard memory for project data, with support for external storage via CompactFlash cards. Operating voltage is 24 V DC, and the unit is built to IEC 61131 standards for industrial environments.

The SIMATIC MP 370 is widely deployed in machine tool automation, packaging machinery, automotive manufacturing lines, and process plant control rooms. Its combination of touch screen and function key operation makes it suitable for applications requiring both intuitive graphical navigation and dedicated control inputs. The panel's robust construction and wide operating temperature range make it reliable in demanding factory floor conditions.

Technical Specifications

Display Size	12.1 inch
Display Resolution	800 x 600 pixels (SVGA)
Display Type	TFT color LCD
Display Colors	256 colors
Touch Technology	Resistive touch screen with function keys
Input/Operating Voltage	24 V DC
Power Consumption	Approx. 30 W
Communication Interface	MPI, PROFIBUS DP, Ethernet (TCP/IP), RS-422/485
Memory	12 MB project memory; 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 panel)
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. The configured connection to the controller cannot be established or has been lost.
Check MPI/PROFIBUS or Ethernet cable connections and termination resistors. Verify the PLC address and communication parameters in WinCC flexible match the hardware configuration.
Event ID: 10001: Connection to PLC interrupted during runtime. The HMI has lost communication with the configured controller.
Inspect physical cabling and connectors. Confirm the PLC is in RUN mode and that the network address settings are consistent between the HMI project and the PLC.
Event ID: 20000: Tag read error. The HMI is unable to read a configured tag or variable from the PLC.
Verify the tag address in the WinCC flexible project matches the actual data block or memory area in the PLC. Check that the PLC program contains the referenced variable.
Event ID: 20001: Tag write error. A write operation to a PLC variable has failed.
Confirm the target PLC memory area is not write-protected. Check the tag address configuration and ensure the PLC is in a state that accepts write commands.
Event ID: 40000: Project download error. Transfer of the WinCC flexible project to the panel has failed or been interrupted.
Ensure the transfer cable is correctly connected and the panel is in Transfer mode. Check that the PC and panel communication settings (baud rate, interface) match.
Event ID: 50000: Internal system error or runtime fault. The HMI runtime software has encountered an unexpected error.
Perform a warm restart of the panel. If the fault persists, reload the WinCC flexible project. Check for firmware compatibility between the project and the panel firmware version.
Event ID: 60000: Memory overflow or insufficient memory for project execution. Available project memory is exhausted.
Reduce the project size by optimizing graphics and scripts. Use a CompactFlash card for extended storage. Ensure no unnecessary background applications are running.

Frequently Asked Questions

What communication interfaces are available on the 6AV6446-1AA40-1AB3?

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

Which software is used to configure and program this HMI panel?

The panel is configured using Siemens WinCC flexible engineering software. Projects are created on a PC and downloaded to the panel via MPI, Ethernet, or USB/serial transfer cable.

Is the 6AV6446-1AA40-1AB3 compatible with S7-300 and S7-400 PLCs?

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

What is the front panel protection rating of this unit?

The front panel of the MP 370 meets IP65 protection, making it resistant to dust ingress and low-pressure water jets, suitable for typical industrial panel installation environments.

Can the CompactFlash card slot be used for project storage and data logging?

Yes, the CompactFlash card slot supports external storage for project data, recipe data, and data logging, effectively extending the onboard memory capacity of the panel.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the panel's power connector. Check that the supply is within the specified tolerance. Inspect the internal fuse if accessible.

Correct any supply voltage issues. If voltage is present and the display remains blank, the backlight or internal power supply board may have failed and the unit should be sent for repair or the backlight replaced.

HMI cannot establish communication with the PLC

Verify the physical cable connections on the MPI or PROFIBUS port. Check the bus termination at both ends of the network. Confirm the PLC address and baud rate settings in the WinCC flexible project match the actual PLC configuration.

Replace or reseat the communication cable. Correct any address or baud rate mismatches in the project settings. Ensure termination resistors are correctly placed at the network endpoints.

Touch screen does not respond or responds inaccurately

Check whether the touch screen responds at all or only in certain areas. Attempt a touch screen recalibration from the panel's Start Center or Control Panel menu.

Recalibrate the touch screen using the built-in calibration utility. If calibration does not resolve the issue, the touch glass or touch controller board may be damaged and require replacement.

Project fails to transfer from PC to panel

Confirm the panel is set to Transfer mode via the Start Center. Verify the communication interface settings (MPI address, baud rate, or Ethernet IP address) match between the PC and the panel.

Set the correct transfer parameters in WinCC flexible and on the panel. If using Ethernet, ensure both devices are on the same subnet. Retry the transfer; if it continues to fail, check the transfer cable or network switch.

Panel displays 'No project' or boots to Start Center unexpectedly

This typically indicates the project stored in flash memory has been lost or corrupted, often due to a power interruption during a previous download.

Re-download the WinCC flexible project to the panel from the engineering PC. Ensure stable power is maintained during the transfer process to prevent recurrence.

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