Siemens 6AV6344-2AC24-0MF6 OP177B

€ 1.995,00

SKU: 6AV6344-2AC24-0MF6 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6344-2AC24-0MF6 is an OP177B operator panel belonging to the SIMATIC HMI family, designed for machine-level human-machine interface applications. This unit provides a monochrome display with keypad-based operation and is part of the Comfort/Basic panel generation used extensively in industrial automation environments. The OP177B series bridges the gap between simple text displays and full graphical touchscreen panels, offering a practical solution for process visualization and control.

The 6AV6344-2AC24-0MF6 features a 5.7-inch STN monochrome display with a resolution of 320 x 240 pixels and function key operation via membrane keypad. It supports MPI and PROFIBUS DP communication interfaces for direct integration with Siemens S7-200, S7-300, and S7-400 PLCs, as well as serial interfaces for third-party controller connectivity. The panel includes onboard flash memory for project storage and runs the WinCC flexible runtime environment, allowing configuration via Siemens WinCC flexible engineering software.

The OP177B is widely deployed in machine building, packaging, material handling, and process automation industries where a robust, keypad-operated HMI is preferred over touchscreen solutions. Its sealed front panel construction and wide operating temperature range make it suitable for installation in control cabinet doors in demanding industrial environments. The unit is particularly common in retrofit and upgrade projects for existing S7-300 and S7-400 PLC-based systems.

Technical Specifications

Display Size	5.7 inch
Display Type	STN monochrome LCD
Display Resolution	320 x 240 pixels
Display Colors	Monochrome (blue/white)
Input/Operating Voltage	24 V DC
Power Consumption	Max. 9 W
Communication Interface	MPI, PROFIBUS DP, RS-422/485 (serial)
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
Series/Product Family	SIMATIC HMI OP177B
Certifications	CE, UL, cULus
Engineering Software	WinCC flexible 2008 or later

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC. The panel cannot establish or maintain a connection to the configured controller.
Check MPI/PROFIBUS cable connections and termination resistors. Verify the PLC address and baud rate settings match the HMI project configuration. Ensure the PLC is in RUN mode.
Event ID: 10001: Connection to PLC interrupted during runtime. The HMI lost communication with the controller after an initial successful connection.
Inspect cable integrity and connector seating. Check for electromagnetic interference sources near the communication cable. Verify PLC is operational and not in STOP or fault state.
Event ID: 20000: Project download error. The transfer of the HMI project from the engineering PC to the panel failed.
Verify the transfer cable is correctly connected and the correct COM port is selected. Ensure the panel is in Transfer mode. Check WinCC flexible version compatibility with the panel firmware.
Event ID: 40000: System memory low. Available memory on the panel for runtime operation is insufficient.
Reduce the number of active alarms or data logs stored on the panel. Optimize the project to reduce memory usage. Consider archiving or deleting old log data.
Event ID: 50000: Internal device error or hardware fault detected during panel self-test or operation.
Perform a panel restart. If the error persists, note the full event ID and sub-code, then contact Siemens technical support or arrange for hardware inspection and repair.
Event ID: 60000: Configuration error detected. The loaded project contains settings incompatible with the panel hardware version or firmware.
Re-download the project using a compatible version of WinCC flexible. Verify the target panel type selected in the engineering software matches the physical hardware model 6AV6344-2AC24-0MF6.
Event ID: 70000: Firmware update error. An error occurred during a panel firmware update procedure.
Restart the panel and reattempt the firmware update using the correct firmware package for the OP177B. Ensure stable power supply during the update process and do not interrupt the transfer.

Frequently Asked Questions

Which PLCs are compatible with the Siemens OP177B 6AV6344-2AC24-0MF6?

The OP177B is compatible with Siemens S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It also supports serial communication for connectivity with third-party controllers from manufacturers such as Allen-Bradley, Mitsubishi, and Omron.

What engineering software is required to configure this HMI panel?

The OP177B is configured using Siemens WinCC flexible 2008 or a compatible later version. Projects are created on a PC and downloaded to the panel via a PC/PPI cable or MPI adapter.

What is the display type and resolution of the 6AV6344-2AC24-0MF6?

This panel features a 5.7-inch STN monochrome LCD with a resolution of 320 x 240 pixels. It is operated via a membrane keypad with function keys rather than a touchscreen.

What is the front panel protection rating of the OP177B?

The front panel of the OP177B carries an IP65 protection rating, making it resistant to dust ingress and low-pressure water jets, suitable for installation in industrial control cabinet doors.

Can the OP177B panel firmware be updated in the field?

Yes, the OP177B firmware can be updated in the field using the ProSave tool or via WinCC flexible. The panel must be placed in Transfer mode and connected to the engineering PC using the appropriate interface cable.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel power connector. Check that polarity is correct and voltage is within the 20.4–28.8 V DC tolerance range. Inspect the internal fuse if accessible.

Correct any wiring errors or supply voltage issues. If supply voltage is confirmed correct and the display remains blank, the internal power supply or backlight inverter may have failed and the unit should be sent for repair or replacement.

Panel displays 'No connection to PLC' or communication error at startup

Verify the MPI or PROFIBUS DP cable is correctly connected to both the panel and the PLC. Check that the bus termination resistors are enabled at both ends of the network. Confirm the PLC address configured in the HMI project matches the actual PLC station address.

Correct cable connections and termination settings. Update the HMI project with the correct PLC address and baud rate, then re-download the project to the panel. Replace the communication cable if physical damage is found.

HMI project cannot be downloaded to the panel from the engineering PC

Confirm the panel is set to Transfer mode (accessible via the panel's Start Center or loader menu). Check the PC interface settings in WinCC flexible match the physical connection type (serial, MPI, or Ethernet if applicable).

Switch the panel to Transfer mode before initiating the download. Ensure the correct communication adapter and driver are installed on the engineering PC. Try a different cable or USB-to-serial adapter if the connection is not established.

Touchkeys or function keys are unresponsive

Check whether the panel is in a locked or protected state due to a password-protected screen. Inspect the membrane keypad for physical damage such as delamination or contamination under the keys.

Deactivate any active screen protection or operator authorization lock via the project configuration. If physical keypad damage is confirmed, the membrane keypad assembly requires replacement by a qualified repair technician.

Panel reboots repeatedly or freezes during operation

Check the 24 V DC supply for voltage dips or ripple, particularly during machine load changes. Review the alarm and event log for recurring system event codes that may indicate a software or memory fault.

Stabilize the power supply by adding a buffer capacitor or UPS module. If the issue is software-related, perform a factory reset and re-download the project. Persistent hardware faults require the unit to be inspected and repaired.

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