Siemens 6AV6355-1AA47-7DM3 OP 77A

€ 2.070,40

SKU: 6AV6355-1AA47-7DM3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7DM3 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. It is a compact, key-operated panel designed for machine-level operator control and monitoring tasks in industrial environments. This unit provides a straightforward interface for process visualization and parameter input without the complexity of a full graphical HMI system.

The OP 77A features a monochrome LCD display with a defined character-based interface, supporting communication via MPI and PROFIBUS DP interfaces for direct integration with Siemens SIMATIC S7 PLCs. The panel includes a membrane keypad with function keys, numeric keys, and system keys for operator input. It is configured using Siemens WinCC flexible software and supports alarm management, recipe handling, and simple trend display functions within its operational scope.

The OP 77A is widely used in manufacturing machinery, packaging equipment, and process automation systems where a cost-effective, robust operator interface is required. Its compact form factor and panel-mount design make it suitable for integration into control cabinets and machine front panels. Industries such as food and beverage, automotive assembly, and general factory automation commonly deploy this panel for local machine control and status monitoring.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	Max. 5 W
Communication Interface	MPI, PROFIBUS DP
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), IP20 (rear)
Mounting	Panel mounting
Configuration Software	WinCC flexible 2008 or later
Certifications	CE, UL
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes and System Events

Event ID: 10000: Communication error between the OP 77A and the connected PLC. The panel cannot establish or maintain a connection to the configured controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect the communication cable for damage or loose connectors. Check network topology and bus termination. Restart the panel and PLC if the connection is not automatically restored.
Event ID: 20000: Configuration error detected. The project loaded on the panel is incompatible or corrupt.
Re-download the project from WinCC flexible to the panel. Verify the project was compiled without errors before transfer.
Event ID: 40000: Internal device error or hardware fault detected.
Perform a panel restart. If the fault persists, check the 24 V DC supply voltage and connections. Contact Siemens technical support or arrange for unit repair if the error is not resolved.
Event ID: 50000: Alarm buffer overflow. The number of pending alarms has exceeded the panel's buffer capacity.
Acknowledge and clear existing alarms on the panel. Review the alarm configuration in WinCC flexible to reduce unnecessary alarm generation.
Event ID: 60000: Recipe data error. A recipe transfer or read/write operation has failed.
Check the recipe configuration in the project. Verify that the PLC data blocks referenced by the recipe are correctly addressed and accessible.
Event ID: 70000: Operating system or firmware error detected during startup.
Perform a factory reset of the panel if accessible. Re-flash the panel firmware using the appropriate Siemens ProSave tool and re-download the project.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

The OP 77A is designed for use with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP communication interfaces.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are compiled and downloaded to the panel via a PC connection.

What is the supply voltage for the 6AV6355-1AA47-7DM3?

The panel operates on a 24 V DC supply voltage. Ensure the power source is within the specified tolerance range to avoid operational issues.

What is the front panel protection rating of the OP 77A?

The front panel of the OP 77A carries an IP65 protection rating, making it resistant to dust ingress and low-pressure water jets, suitable for industrial machine front panels.

Can the OP 77A display graphical content?

No, the OP 77A uses a character-based monochrome LCD display and does not support graphical or bitmap image display. It is suited for text-based status and alarm information.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the panel power connector. Check for blown fuses or wiring faults in the supply circuit.

Restore the correct 24 V DC supply. If the supply is confirmed correct and the display remains blank, the internal power supply or display unit may be faulty and the panel should be sent for repair.

Panel shows communication error and cannot connect to PLC

Verify the MPI or PROFIBUS DP cable is correctly connected and terminated at both ends. Check that the PLC station address and baud rate configured in WinCC flexible match the actual PLC settings.

Correct any address or baud rate mismatches in the project configuration and re-download. Replace the communication cable if it is damaged. Ensure bus termination resistors are active only at the physical ends of the network.

Panel repeatedly restarts or enters a boot loop

Check the 24 V DC supply for voltage drops or instability under load. Inspect the panel for signs of internal hardware faults.

Stabilize the power supply. Attempt a firmware re-flash using Siemens ProSave tool. If the restart loop continues after firmware recovery, the panel likely has an internal hardware fault requiring professional repair.

Function keys or membrane keypad not responding

Inspect the keypad membrane for physical damage, contamination, or deformation. Test individual keys to determine if the fault is isolated to specific keys or the entire keypad.

Clean the keypad surface if contamination is present. If keys are physically damaged or the keypad connector is faulty internally, the membrane keypad assembly should be replaced by a qualified technician.

Project download from WinCC flexible fails

Check the PC-to-panel communication cable and the selected transfer interface in WinCC flexible. Verify the panel is in transfer mode.

Place the panel in transfer mode via the panel's startup menu. Use a known-good MPI or USB-to-MPI adapter. Ensure the WinCC flexible project is compiled without errors before initiating the download.

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