Siemens 6AV6344-4AD25-0CG0 OP 277

€ 1.995,00

SKU: 6AV6344-4AD25-0CG0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6344-4AD25-0CG0 is an Operator Panel (OP 277) belonging to the SIMATIC HMI series, designed for machine-level operator control and monitoring in industrial automation environments. This panel features a 5.7-inch TFT color display and is part of the SIMATIC HMI 270 series, which provides a robust and compact solution for process visualization. The unit is manufactured by Siemens and is compatible with the SIMATIC WinCC flexible engineering software for project configuration.

The OP 277 offers a 5.7-inch TFT display with a resolution of 320 x 240 pixels (QVGA) and 256 colors, combined with a membrane keypad for operator input. It supports MPI and PROFIBUS DP communication interfaces, enabling direct integration with Siemens S7-200, S7-300, and S7-400 PLCs. The panel includes 512 KB of user memory for project data, operates on a 24 V DC supply, and is rated IP65 on the front face for protection against dust and water ingress.

The OP 277 is widely deployed in machine building, automotive manufacturing, food and beverage processing, and packaging machinery where a compact, keypad-operated HMI is required. Its PROFIBUS DP connectivity makes it well suited for integration into distributed automation architectures. The panel's rugged construction and IP65 front protection make it appropriate for installation in industrial control cabinets and harsh production environments.

Technical Specifications

Display Size	5.7 inch
Display Type	TFT color
Display Resolution	320 x 240 pixels (QVGA)
Display Colors	256 colors
Input Type	Membrane keypad
Input/Operating Voltage	24 V DC
Power Consumption	Max. 6 W
Communication Interface	MPI, PROFIBUS DP
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

Common Error Codes and System Events

Event ID: 10000: Configuration error detected during startup; the project data loaded on the panel is invalid or corrupted.
Reload the project using SIMATIC WinCC flexible. Verify the project was compiled without errors before transferring.
Event ID: 10001: No project found on the device; the panel has started without a valid user project.
Transfer a valid compiled project to the panel via MPI, PROFIBUS, or USB/serial connection using WinCC flexible.
Event ID: 20000: Communication error with the configured PLC; the panel cannot establish or maintain a connection to the controller.
Check MPI or PROFIBUS DP cabling, termination resistors, and bus address settings. Verify PLC is powered and running.
Event ID: 20001: PLC connection timeout; the panel lost communication with the PLC during runtime.
Inspect bus wiring for breaks or shorts. Confirm baud rate and station address match on both panel and PLC. Restart both devices if necessary.
Event ID: 40000: System memory low; available runtime memory on the panel is insufficient for the current project.
Reduce project size by optimizing screens, reducing the number of tags, or archiving data. Consider upgrading to a panel with greater memory capacity.
Event ID: 50000: Internal device error; a hardware fault has been detected within the panel.
Perform a power cycle. If the error persists, back up the project and arrange for repair or replacement of the unit.
Event ID: 60000: Transfer mode active; the panel is waiting for a project download from the engineering PC.
Transfer the project from WinCC flexible, or press the appropriate key combination to exit transfer mode and return to runtime if no transfer is intended.

Frequently Asked Questions

Which PLCs are compatible with the OP 277 (6AV6344-4AD25-0CG0)?

The OP 277 is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with S7-1200 and S7-1500 controllers in some configurations using appropriate drivers in WinCC flexible.

What engineering software is required to configure this panel?

The OP 277 is configured using Siemens SIMATIC WinCC flexible 2008 or later. Projects are compiled and transferred to the panel via MPI, PROFIBUS DP, or a serial/USB PC adapter.

What is the supply voltage for the 6AV6344-4AD25-0CG0?

The panel operates on a 24 V DC supply voltage. Ensure the power supply can deliver sufficient current, as the panel consumes up to 6 W during operation.

What is the front panel protection rating of the OP 277?

The front face of the OP 277 is rated IP65, providing full protection against dust ingress and protection against low-pressure water jets. The rear of the unit is rated IP20.

Can the OP 277 be used as a replacement for older SIMATIC HMI panels?

The OP 277 is a direct functional successor to earlier SIMATIC OP panels such as the OP 27. Existing WinCC flexible projects can often be migrated with minimal modification, though hardware mounting cutouts may differ.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Check that the supply is within tolerance and can deliver adequate current. Inspect the panel for any visible damage.

Correct the supply voltage if out of range. If voltage is correct and the display remains blank, the internal power supply or backlight may have failed and the unit should be sent for repair or replacement.

Panel fails to communicate with the PLC

Verify MPI or PROFIBUS DP bus address settings on both the panel and PLC. Check physical cabling for continuity and correct termination at both ends of the bus. Confirm baud rate settings match on all devices.

Correct any address conflicts or baud rate mismatches. Replace damaged cables or connectors. Ensure bus termination resistors are active only at the two physical ends of the bus segment.

Project transfer from WinCC flexible fails or times out

Check the PC adapter or MPI/PROFIBUS cable connection between the engineering PC and the panel. Confirm the panel is in transfer mode (accessible via the panel's Start Center or loader menu). Verify COM port or USB adapter driver is correctly installed on the PC.

Restart the panel in transfer mode via the Start Center. Reinstall or update the PC adapter driver. Try a different cable or adapter if the issue persists.

Touchscreen or keypad inputs are not responding correctly

For keypad issues, inspect the membrane overlay for physical damage or contamination. Check whether the problem is consistent across all keys or isolated to specific ones.

Clean the keypad surface with a dry cloth. If specific keys are permanently unresponsive, the membrane keypad assembly may need replacement. Recalibrate or replace the unit if the fault is hardware-related.

Panel repeatedly restarts or enters an error loop on startup

Attempt to access the Start Center during boot by pressing the appropriate key. Check whether the loaded project is causing the restart by entering transfer mode and loading a minimal test project.

Transfer a freshly compiled project to the panel. If the restart loop continues without any project loaded, the panel firmware may be corrupted or there is an internal hardware fault requiring professional repair.

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