Siemens 6AV6344-2AC24-0MG7 OP 177B

€ 1.995,00

SKU: 6AV6344-2AC24-0MG7 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6344-2AC24-0MG7 is an Operator Panel (OP 177B) belonging to the SIMATIC HMI series, designed for machine-level human-machine interface applications. This unit provides a monochrome or color display with touch and key-based operation, serving as a compact yet capable panel for process visualization and control. It is part of Siemens' established SIMATIC HMI product line, offering reliable performance in industrial environments.

The OP 177B features a 5.7-inch STN display and supports both MPI/PROFIBUS DP and Ethernet (PROFINET) communication interfaces, enabling flexible integration into existing Siemens automation architectures. The panel is configured using WinCC flexible engineering software and supports scripting, alarm management, recipe handling, and trend displays. It operates on 24 V DC supply and is rated to IP65 on the front face, providing protection against dust and water ingress in panel-mounted installations.

The OP 177B is widely deployed in manufacturing, packaging, food and beverage, and general machine automation applications where a compact operator interface is required. Its compatibility with SIMATIC S7-200, S7-300, and S7-400 PLCs makes it a versatile choice for retrofitting or new installations. The combination of key-based and optional touch operation suits environments where gloved operation or robust input methods are preferred.

Technical Specifications

Display Size	5.7 inch
Display Type	STN LCD
Display Colors	256 colors
Display Resolution	320 x 240 pixels (QVGA)
Touch Technology	Resistive touchscreen (touch variant)
Input/Operating Voltage	24 V DC
Power Consumption	Max. 9 W
Communication Interface	MPI/PROFIBUS DP, Ethernet (PROFINET), USB
Configuration Software	WinCC flexible 2008 or later
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
Mounting	Panel mounting
Certifications	CE, UL, cULus

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.
Check MPI/PROFIBUS DP or Ethernet cable connections and termination resistors. Verify PLC address settings and communication parameters in WinCC flexible project match the hardware configuration.
Event ID: 10001: Connection to the configured PLC has been interrupted during runtime.
Inspect physical communication cables for damage. Confirm PLC is powered and running. Check for address conflicts on the network and verify baud rate settings.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel successfully.
Ensure the correct communication interface is selected in WinCC flexible transfer settings. Verify the panel is in transfer mode and that the PC and panel are connected via USB or Ethernet.
Event ID: 40000: System memory low. The panel's available runtime memory is insufficient for the loaded project.
Reduce the number of active alarms, trends, or recipe data sets in the project. Optimize the WinCC flexible project to reduce memory usage and re-download to the panel.
Event ID: 50000: Internal device error detected. A hardware fault has been identified within the panel.
Perform a panel restart. If the error persists, back up the project, perform a factory reset, and reload the project. Contact Siemens technical support if the fault continues.
Event ID: 70000: Configuration error. The loaded project contains settings incompatible with the current panel firmware version.
Update the panel firmware to the version compatible with the WinCC flexible project version. Re-download the project after firmware update.
Event ID: 30000: Tag read/write error. A configured variable (tag) could not be read from or written to the PLC.
Verify the PLC data block addresses referenced in the HMI project exist and are accessible. Check PLC program for address changes and update the HMI project accordingly.

Frequently Asked Questions

Which PLCs are compatible with the OP 177B (6AV6344-2AC24-0MG7)?

The OP 177B is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It also supports PROFINET communication for connection to S7-300/400 controllers with Ethernet capability.

What software is required to configure and program the OP 177B?

The OP 177B is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are transferred to the panel via USB or Ethernet connection.

What is the supply voltage for the 6AV6344-2AC24-0MG7?

The panel operates on a 24 V DC supply voltage. Ensure the power supply can deliver sufficient current, typically up to 0.5 A at 24 V DC.

Is the OP 177B front panel rated for wash-down or dusty environments?

Yes, the front face of the OP 177B carries an IP65 protection rating, making it suitable for environments with dust and water spray. The rear of the unit is rated IP20.

Can the OP 177B be used as a replacement for older Siemens OP panels?

The OP 177B can serve as a functional replacement for older SIMATIC HMI panels such as the OP 17 and OP 27, provided the WinCC flexible project is adapted to the new panel type and communication settings are reconfigured accordingly.

Troubleshooting

Display remains blank after power is applied

Measure 24 V DC at the power supply connector on the rear of the panel. Check the internal fuse if accessible. Verify the power supply unit can deliver adequate current.

Replace the power supply if voltage is absent or out of tolerance. If voltage is correct but display remains blank, the backlight or internal display board may have failed and the panel will require repair or replacement.

Panel displays 'Connecting…' and fails to communicate with the PLC

Check the MPI/PROFIBUS DP cable connections at both the panel and PLC ends. Verify bus termination is correctly applied at both ends of the network. Confirm the panel's configured PLC address matches the actual PLC address.

Replace or reseat communication cables. Correct bus termination using appropriate resistors or termination plugs. Update the HMI project communication settings in WinCC flexible and re-download to the panel.

Touchscreen does not respond or responds inaccurately to touch input

Check whether the touchscreen responds at all by testing multiple areas of the screen. Determine if the issue is a complete failure or a calibration drift. Access the panel's system menu to attempt touchscreen recalibration.

Perform a touchscreen calibration via the panel's Start Center or Control Panel menu. If calibration does not resolve the issue, the touchscreen overlay may be damaged and require replacement.

Panel repeatedly reboots or freezes during operation

Check the 24 V DC supply for voltage dips or instability under load. Review the active alarm log for system memory or internal error events. Verify the WinCC flexible project is not overloading the panel's CPU with excessive tag polling rates.

Stabilize the power supply and ensure adequate current capacity. Optimize the HMI project by reducing tag update cycles and unnecessary graphical elements. If the problem persists, perform a firmware update or factory reset and reload the project.

Project transfer from PC to panel fails

Confirm the panel is set to transfer mode via the Start Center. Check the USB or Ethernet cable connection between the PC and panel. Verify that the WinCC flexible project is configured for the correct panel type and communication interface.

Switch the panel to transfer mode manually through the Start Center menu. Replace the USB cable if faulty. Ensure the PC firewall is not blocking the WinCC flexible transfer process. Match the project panel type to the physical hardware before retrying the transfer.

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