Siemens 6AV6344-2AC24-0MG6 OP 177B

€ 1.995,00

SKU: 6AV6344-2AC24-0MG6 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6344-2AC24-0MG6 is an OP 177B operator panel belonging to the SIMATIC HMI family, designed for machine-level human-machine interface applications. This unit provides a monochrome STN display with touch and key-based operation, enabling operators to monitor and control industrial processes directly at the machine. It is part of Siemens' mid-range HMI portfolio, positioned between basic text panels and full-featured comfort panels.

The OP 177B features a 5.7-inch STN display with a resolution of 320 x 240 pixels and supports up to 256 colors in its color variant, though this specific unit (6AV6344-2AC24-0MG6) features a monochrome display. It is equipped with MPI/PROFIBUS DP and RS-422/RS-485 interfaces for communication with Siemens S7-200, S7-300, and S7-400 PLCs, as well as third-party controllers. The panel includes 512 KB of user memory, supports recipe management, alarm logging, and trend displays, and is configured using WinCC flexible 2004 or later software.

The OP 177B is widely deployed in manufacturing, packaging, and process automation environments where a compact, robust operator interface is required at the machine level. Its compatibility with the SIMATIC S7 controller family makes it a standard choice for OEMs building machinery for the automotive, food and beverage, and chemical industries. The panel's front-face IP65 protection rating makes it suitable for installation in control cabinet doors in environments with dust and water spray exposure.

Technical Specifications

Display Size	5.7 inch
Display Resolution	320 x 240 pixels
Display Type	Monochrome STN LCD
Touch Technology	Resistive touchscreen with membrane keypad
Input/Operating Voltage	24 V DC
Power Consumption	Max. 9 W
Communication Interface	MPI/PROFIBUS DP, RS-422/RS-485
User Memory	512 KB
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
Configuration Software	WinCC flexible 2004 or later

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC. The connection to the controller has been interrupted or cannot be established.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the HMI project configuration. Restart both the HMI and PLC if necessary.
Event ID: 10001: Connection to the PLC was established but subsequently lost during operation.
Inspect cable integrity and connector seating. Check for electromagnetic interference sources near the communication cable. Verify PLC is in RUN mode and not in fault state.
Event ID: 20000: Project download error. The project transfer from the configuration PC to the HMI panel failed.
Verify the transfer cable is correctly connected and the correct COM port or network interface is selected in WinCC flexible. Ensure the HMI is in Transfer mode before initiating download.
Event ID: 40000: System memory low. Available memory on the HMI device is insufficient to load or run the current project.
Reduce the project size by removing unused images, scripts, or recipes. Ensure no unnecessary background applications are running on the panel.
Event ID: 50000: Operating system error or internal system fault detected on the HMI panel.
Perform a warm restart of the panel. If the fault persists, perform a factory reset and reload the project. Check for firmware compatibility with the loaded project version.
Event ID: 70000: Recipe data error. A recipe record could not be read from or written to the internal storage.
Check available storage space on the panel. Verify recipe configuration in WinCC flexible. Re-download the project if recipe data structures have been modified.
Event ID: 60000: Tag update error. One or more process tags could not be updated within the configured cycle time.
Increase the tag update cycle time in the project configuration. Reduce the number of tags polled simultaneously. Check PLC scan cycle time and communication load.

Frequently Asked Questions

Which PLCs are compatible with the OP 177B (6AV6344-2AC24-0MG6)?

The OP 177B is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It also supports communication with third-party controllers via the RS-422/RS-485 interface using standard protocols.

What software is required to configure the OP 177B?

The OP 177B is configured using Siemens WinCC flexible 2004 or any later version of WinCC flexible. Projects are transferred to the panel via a serial PC/PPI cable or MPI adapter.

What is the front panel protection rating of the OP 177B?

The front face of the OP 177B carries an IP65 protection rating, making it suitable for installation in control cabinet doors where it may be exposed to dust and water spray.

Can the OP 177B display trend curves and alarms?

Yes, the OP 177B supports trend displays, alarm logging, and recipe management as standard functions within WinCC flexible projects configured for this panel.

What is the supply voltage required for the OP 177B?

The OP 177B requires a 24 V DC supply voltage. The power consumption is a maximum of 9 W under normal operating conditions.

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 to confirm supply integrity. Inspect the internal fuse if accessible.

Ensure the 24 V DC supply is within tolerance. Replace any blown fuse. If the backlight has failed, the panel may require backlight replacement or full unit exchange.

HMI shows 'No connection to PLC' message continuously

Verify the MPI or PROFIBUS DP address configured in the HMI project matches the address set on the PLC. Check cable connections, terminating resistors at both ends of the bus, and cable continuity.

Correct any address mismatch in the WinCC flexible project and re-download. Replace damaged cables or connectors. Ensure bus termination is active only at both physical ends of the network segment.

Touchscreen does not respond or responds inaccurately

Attempt a touchscreen calibration from the panel's system settings menu. Check for physical damage or contamination on the touch surface.

Perform a touchscreen recalibration via the Control Panel in the panel's Start menu. Clean the touch surface with a soft, dry cloth. If calibration fails repeatedly, the touch foil may require replacement.

Project transfer from PC to panel fails

Confirm the HMI panel is set to Transfer mode. Verify the communication interface settings (COM port, baud rate, or MPI address) in WinCC flexible match the physical connection being used.

Switch the panel to Transfer mode via the Start Center. Use the correct transfer cable (PC/PPI or MPI adapter). Reinstall the WinCC flexible communication driver on the PC if the port is not recognized.

Panel repeatedly restarts or freezes during operation

Check the 24 V DC supply for voltage dips or ripple that may cause the panel to reset. Review the project for script errors or excessive tag polling that could overload the processor.

Stabilize the power supply and ensure it is adequately rated. Simplify the project by reducing script complexity and tag update frequency. Update the panel firmware to the latest compatible version and re-download the project.

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