Siemens 6AV6355-1AA47-7BC0 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7BC0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7BC0 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 human-machine interface applications, providing operators with a straightforward means of monitoring and controlling automated processes. The OP 77A is part of Siemens' SIMATIC HMI Basic Panels generation, intended for use with SIMATIC S7 controllers via direct or network connections.

The OP 77A features a monochrome STN LCD display and is operated via a membrane keypad, making it robust for industrial environments where touchscreen operation is not required. It supports MPI and PROFIBUS DP communication interfaces for direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and offers a defined number of configurable screens, tags, and alarms suited to entry-level HMI requirements. Its compact housing is designed for panel mounting with a standard cutout.

The OP 77A is typically deployed in manufacturing, packaging, and process automation environments where a cost-effective, reliable operator interface is needed at the machine level. It is well suited for applications requiring basic process visualization, alarm display, and parameter input without the complexity of a full graphical touchscreen panel. Industries such as food and beverage, automotive assembly, and general machine building commonly use this panel for local operator stations.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
Input/Operating Voltage	24 V DC
Power Consumption	Max. 6 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, cULus
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 corrupted.
Re-transfer the project from WinCC flexible to the panel. Verify the project was compiled without errors before transfer.
Event ID: 10001: Communication error: No connection to the configured PLC or controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the panel configuration.
Event ID: 20000: Tag read error: A configured 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: 20001: Tag write error: A value cannot be written to the controller tag.
Check that the target PLC address is not write-protected. Verify communication link is active and the PLC is in RUN mode.
Event ID: 40000: System memory low: Available panel memory for runtime operation is insufficient.
Reduce the number of active screens, alarms, or tags in the project. Re-transfer an optimized project to the panel.
Event ID: 50000: Alarm buffer overflow: The alarm log has exceeded its maximum capacity.
Acknowledge and clear pending alarms. Adjust alarm buffer size in WinCC flexible project settings if possible.
Event ID: 60000: Operating system error: An internal panel system fault has occurred.
Perform a panel restart. If the fault persists, restore the panel operating system using ProSave or WinCC flexible transfer mode.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A panel?

The OP 77A supports direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with S7-200 via PPI protocol.

What software is required to configure the 6AV6355-1AA47-7BC0?

The panel is configured using Siemens WinCC flexible 2005 or a later version. Projects are transferred to the panel via MPI, PROFIBUS DP, or a serial PC/PPI cable.

What is the supply voltage for this operator panel?

The OP 77A requires a 24 V DC supply voltage for operation.

What is the IP protection rating of the OP 77A?

The front face of the panel is rated IP65, providing protection against dust and water jets. The rear of the housing is rated IP20.

Can the OP 77A display graphics or only text?

The OP 77A has a monochrome LCD display capable of showing text, simple graphics, and bar graphs as configured in WinCC flexible, but it does not support full-color graphical visualization.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel power connector using a multimeter. Verify the power supply is within the specified voltage range and capable of supplying sufficient current.

Ensure the 24 V DC supply is stable and correctly wired. If the supply is confirmed good but the display remains blank, the internal power supply or backlight may be faulty and the panel may require repair or replacement.

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

Inspect the MPI or PROFIBUS DP cable for physical damage and verify correct termination at both ends of the bus. Check that the PLC address configured in WinCC flexible matches the actual PLC station address.

Replace or reseat the communication cable. Correct any address mismatches in the WinCC flexible project and re-transfer. Ensure bus termination resistors are active only at the two physical ends of the network.

Project transfer from WinCC flexible fails

Verify the transfer cable connection between the PC and the panel. Confirm the panel is set to transfer mode and that the correct communication port and baud rate are selected in WinCC flexible transfer settings.

Switch the panel to transfer mode via the panel start screen. Check and correct COM port settings on the PC. Try a different transfer cable if available, as cable faults are a common cause of failed transfers.

Operator keypad buttons are unresponsive

Check whether the panel is in runtime mode and the project is loaded correctly. Inspect the membrane keypad for physical damage or contamination around the key area.

Restart the panel and reload the project. If specific keys remain unresponsive after restart, the membrane keypad assembly may be worn or damaged and should be replaced.

Alarm messages are not displayed on the panel

Verify that alarm tags are correctly configured in WinCC flexible and that the corresponding PLC bit addresses are correct. Check that the PLC communication link is active and the PLC program is triggering the alarm bits.

Review alarm configuration in WinCC flexible for correct tag addresses and alarm classes. Re-transfer the corrected project to the panel and confirm PLC is in RUN mode with the alarm logic active.

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