Siemens 6AV6355-1AA47-7BC3 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7BC3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7BC3 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for machine-level human-machine interface applications. This compact panel provides a keypad-based interface for process visualization and operator control, and is part of Siemens' SIMATIC HMI product line. It is intended for use in industrial environments where reliable, straightforward operator interaction is required without the need for a full touchscreen display.

The OP 77A features a monochrome STN LCD display and a membrane keypad with function keys, system keys, and numeric entry capability. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration with SIMATIC S7 PLCs. The panel supports configuration through WinCC flexible software and offers a compact, panel-mount form factor with a protection rating suitable for front-panel installation in control cabinets. Operating voltage is 24 V DC, and the unit includes non-volatile memory for storing project data and recipes.

The OP 77A is widely used in manufacturing, machine building, and process automation applications where a cost-effective, robust operator terminal is needed at the machine level. It is suitable for controlling and monitoring discrete manufacturing equipment, conveyor systems, and packaging machinery. Its compatibility with the SIMATIC S7 controller family makes it a practical choice for facilities already standardized on Siemens automation infrastructure.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Communication Interface	MPI, PROFIBUS DP
Protection Rating	IP65 (front panel)
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
Mounting	Panel mounting
Configuration Software	WinCC flexible
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 controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the project configuration. Ensure the PLC is 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 restored automatically.
Event ID: 20000: Project download error. The configuration could not be transferred to the panel.
Verify the PC-to-panel connection and ensure WinCC flexible is correctly configured for the target device. Check available memory on the panel and retry the download.
Event ID: 40000: System memory error detected on the panel.
Perform a factory reset and re-download the project. If the error persists, the internal memory may be faulty and the unit should be repaired or replaced.
Event ID: 50000: Operating system error or firmware mismatch detected.
Update the panel firmware using the appropriate Siemens ProSave tool. Ensure the firmware version is compatible with the WinCC flexible project version.
Event ID: 60000: Panel configuration is missing or corrupted. No valid project found in memory.
Re-download the project from WinCC flexible. Ensure the download completes without interruption and that the correct panel type is selected in the project settings.

Frequently Asked Questions

What communication interfaces does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP communication interfaces, allowing direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible software. The project is then downloaded to the panel via the MPI interface or a direct PC connection.

What is the supply voltage for the 6AV6355-1AA47-7BC3?

The panel operates on 24 V DC supply voltage, which is the standard for SIMATIC HMI operator panels in this series.

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

The OP 77A carries an IP65 protection rating on the front panel, making it suitable for installation in environments with dust and water spray exposure.

Can the OP 77A be used as a replacement for older SIMATIC OP panels?

The OP 77A is designed as a successor to earlier SIMATIC OP panels such as the OP7 and OP17, and can serve as a functional replacement in many applications with appropriate project reconfiguration in WinCC flexible.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel power connector. Verify polarity and measure actual voltage under load. Inspect the internal fuse if accessible.

Correct any wiring errors or supply voltage issues. If the supply is confirmed good and the display remains blank, the internal power supply or display unit may be faulty and require repair or replacement.

Panel shows communication error and cannot connect to PLC

Verify MPI or PROFIBUS DP cable integrity and connector seating. Check that bus termination resistors are correctly placed at both ends of the network. Confirm the PLC station address matches the address configured in the WinCC flexible project.

Replace or reseat communication cables. Correct address settings in the project and re-download. Ensure only the correct nodes have bus termination enabled.

Project download fails from WinCC flexible

Check the PC-to-panel connection cable and the selected communication port in WinCC flexible. Confirm the panel is in transfer mode and that the correct panel type and firmware version are selected in the project.

Switch the panel to transfer mode manually via the panel menu. Use the correct MPI address and baud rate settings. Update panel firmware if a version mismatch is detected using the ProSave utility.

Keypad buttons are unresponsive or intermittently fail

Inspect the membrane keypad for physical damage, contamination, or deformation. Check the internal ribbon cable connection between the keypad and the main board if the unit is open for service.

Clean the keypad surface if contamination is present. If the ribbon cable is damaged or disconnected, reseat or replace it. A faulty membrane keypad assembly should be replaced with the correct spare part.

Panel repeatedly restarts or crashes during operation

Monitor the 24 V DC supply for voltage drops or ripple, which can cause instability. Check for overheating by verifying ambient temperature is within the 0 to 50 degrees C operating range. Review the project for configuration errors that may cause runtime faults.

Stabilize the power supply and ensure adequate ventilation around the panel. Correct any project configuration errors in WinCC flexible and re-download. If hardware faults persist, the main board may require inspection or replacement.

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