Siemens 6AV6355-1AA47-7ER5 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7ER5 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7ER5 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for human-machine interface applications in industrial automation environments. This compact panel provides a keypad-based interface for process visualization and operator control, and is part of Siemens' established SIMATIC HMI product line. The OP 77A series is engineered to integrate seamlessly with Siemens SIMATIC PLCs and other compatible controllers.

The 6AV6355-1AA47-7ER5 features a monochrome LCD display for clear process data visualization and a membrane keypad for reliable operator input in demanding environments. It supports communication via MPI and PROFIBUS DP interfaces, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 controllers. The panel is configured using WinCC flexible software and offers a compact, panel-mount form factor with a protection rating suitable for industrial use. Internal memory supports the storage of recipes, alarms, and process tags.

The OP 77A is widely deployed in manufacturing, process automation, and machine building applications where a cost-effective, robust operator interface is required. It is particularly suited for machinery requiring straightforward process monitoring and control without the need for graphical color displays. Industries such as food and beverage, automotive assembly, and general factory automation commonly utilize this panel for local HMI functionality at machine level.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.5 W
Communication Interface	MPI, PROFIBUS DP
Configuration Software	WinCC flexible 2005 or higher
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
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Configuration error: The project loaded on the panel is incompatible or corrupt.
Reload the project using WinCC flexible. Verify the project was compiled without errors before transfer.
Event ID: 10001: Communication error: No connection to the configured PLC or controller.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify PLC address settings match the HMI project configuration.
Event ID: 10002: Tag read error: A configured process tag cannot be read from the controller.
Verify the tag address in WinCC flexible matches the actual PLC data block or memory address. Check PLC program is running.
Event ID: 10003: Tag write error: A value cannot be written to the configured controller tag.
Check write permissions for the tag in the PLC program. Verify the HMI has write access and the PLC is in RUN mode.
Event ID: 10004: Alarm buffer overflow: The alarm buffer has reached its maximum capacity.
Acknowledge and clear pending alarms. Review alarm configuration to reduce unnecessary alarm triggers.
Event ID: 10005: Recipe data error: Recipe data could not be read from or written to the controller.
Verify recipe tag addresses are correctly configured in WinCC flexible and match the PLC data structure.
Event ID: 10006: Transfer mode active: The panel is waiting for a project transfer from the engineering station.
Transfer the project from WinCC flexible or restart the panel to exit transfer mode if no transfer is intended.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7ER5)?

The OP 77A is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It also supports connection to SIMATIC S7-1200 with appropriate configuration in WinCC flexible.

What software is required to configure and program this operator panel?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later version. Projects are compiled and transferred to the panel via the MPI or PROFIBUS DP interface.

What is the supply voltage for the 6AV6355-1AA47-7ER5?

The panel operates on 24 V DC. Ensure the power supply meets the required current capacity and is within the specified voltage tolerance range.

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 typical industrial environments.

Can the OP 77A display graphical images or color content?

No, the OP 77A uses a monochrome character-based LCD display and does not support graphical images or color content. It is designed for text-based process data display.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the power connector. Verify the supply is within tolerance and the connector is fully seated.

Restore correct 24 V DC supply. If the display remains blank with correct voltage, the internal power supply or display backlight may be faulty and the unit should be inspected or replaced.

Panel shows 'No connection to PLC' or communication error on startup

Inspect the MPI or PROFIBUS DP cable for damage or loose connections. Check that bus termination resistors are correctly installed at both ends of the network segment.

Replace or reseat the communication cable. Verify the PLC address and baud rate settings in the HMI project match the physical network configuration. Ensure the PLC is powered and in RUN mode.

Panel enters transfer mode unexpectedly on startup

The panel may have been set to transfer mode manually, or the startup configuration in the project is set to prompt for transfer. Check the panel's startup behavior settings.

Allow the transfer to complete if a project update is intended, or restart the panel and select 'Start' to exit transfer mode. Adjust the startup mode in WinCC flexible project settings if the issue recurs.

Operator keys are unresponsive or produce incorrect inputs

Inspect the membrane keypad for physical damage, contamination, or worn key surfaces. Test each key systematically using the panel's built-in key test function if available.

Clean the keypad surface with a dry cloth. If keys remain unresponsive, the membrane keypad assembly may require replacement. Contact a qualified repair technician for keypad replacement.

Alarm messages are not displayed or acknowledged correctly

Verify that alarm tags are correctly configured in WinCC flexible and that the corresponding PLC bits are being set as expected. Check the alarm buffer settings for capacity limits.

Review and correct alarm tag addresses in the WinCC flexible project. Increase alarm buffer size if overflow is occurring. Retransfer the corrected project to the panel.

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