Siemens 6AV6355-1AA47-7DD0 OP 77A

€ 955,52

SKU: 6AV6355-1AA47-7DD0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7DD0 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 monitoring and controlling industrial processes and is part of Siemens' SIMATIC HMI product line. It is intended for use as a local operator station in automation environments where a robust, panel-mounted interface is required.

The OP 77A features a monochrome 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 S7-200, S7-300, and S7-400 PLCs. The unit operates on 24 V DC supply voltage and is configured using WinCC flexible software. Its compact housing is designed for front-panel mounting with an IP65 protection rating on the front face.

The 6AV6355-1AA47-7DD0 is typically deployed in machine building, manufacturing automation, and process control applications where a cost-effective, keypad-operated HMI is sufficient. It is well-suited for controlling conveyor systems, packaging machinery, and general-purpose machine tools. 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 LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Communication Interface	MPI, PROFIBUS DP
IP Rating (Front)	IP65
IP Rating (Rear)	IP20
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 2005 or higher
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Certifications	CE, UL

Common Error Codes & 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 configuration in WinCC flexible. 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 bus termination and cable shielding. Restart the panel and PLC if the connection does not recover automatically.
Event ID: 20000: Configuration download error. The project data could not be transferred to the panel correctly.
Verify the WinCC flexible project is compiled without errors. Check the transfer cable or network connection between the engineering PC and the panel. Retry the download.
Event ID: 40000: System memory low. Available memory for runtime operation is insufficient.
Reduce the size of the loaded project by removing unused screens or tags. Ensure no unnecessary background tasks are running. Consider upgrading to a panel with greater memory capacity if the project cannot be reduced.
Event ID: 50000: Operating system error or internal system fault detected on the panel.
Perform a panel restart. If the fault persists, perform a factory reset and reload the project. If the issue continues, the panel may require service or replacement.
Event ID: 60000: Power supply voltage out of range. The 24 V DC supply voltage is below or above the permitted tolerance.
Measure the supply voltage at the panel power connector. Ensure the supply is within the specified 24 V DC tolerance range. Check the power supply unit and wiring for faults.
Event ID: 70000: Keypad or input device fault. A key may be stuck or the keypad membrane is damaged.
Inspect the keypad for physical damage or debris causing a key to remain pressed. Clean the keypad surface. If a key is confirmed faulty, the keypad membrane or panel front assembly may need replacement.

Frequently Asked Questions

What PLC families are compatible with the OP 77A (6AV6355-1AA47-7DD0)?

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

What software is used to configure and program the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or later versions. Projects are compiled and downloaded to the panel via the MPI interface or a direct PC adapter connection.

What is the supply voltage for the 6AV6355-1AA47-7DD0?

The panel operates on a 24 V DC supply voltage. The supply must be within the specified tolerance range for correct operation.

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

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

Does the OP 77A support touch input?

No, the OP 77A is a keypad-based operator panel and does not support touch screen input. User interaction is performed via the membrane keypad with function keys and numeric entry keys.

Troubleshooting

Panel display remains blank after power on

Check that 24 V DC is present at the power supply terminals of the panel using a multimeter. Verify polarity is correct. Inspect internal fuse if accessible.

Restore correct 24 V DC supply voltage. Replace any blown fuse with the correct rating. If the display remains blank with confirmed correct supply, the internal power supply board or display assembly may require replacement.

Panel cannot communicate with the SIMATIC PLC

Verify MPI or PROFIBUS DP address settings on both the panel and PLC match the WinCC flexible project configuration. Check cable connections, bus termination resistors at both ends of the bus, and cable continuity.

Correct any address mismatches in the WinCC flexible project and re-download. Replace damaged cables and ensure proper bus termination. Confirm the PLC is powered and in RUN or STOP mode as required.

Project download from PC to panel fails

Check the PC adapter or MPI cable connection between the engineering PC and the panel. Confirm the correct communication port and transfer settings are selected in WinCC flexible. Verify the project compiles without errors.

Use a known-good PC adapter cable. Set the correct COM port and baud rate in WinCC flexible transfer settings. Recompile the project and retry the download. If the panel is unresponsive, perform a factory reset before attempting the download again.

Function keys do not respond or produce incorrect actions

Inspect the keypad membrane for physical damage, contamination, or a stuck key. Verify the key assignments in the WinCC flexible project are correctly configured for the expected functions.

Clean the keypad surface to remove any debris. If a key is physically damaged, the keypad membrane assembly should be replaced. If the key assignments are incorrect, update the project configuration and re-download to the panel.

Panel displays communication timeout alarm repeatedly during operation

Monitor the MPI or PROFIBUS DP bus for signal integrity issues. Check for loose connectors, damaged cable shielding, or missing bus termination. Verify the PLC scan cycle time is within the configured watchdog timeout period.

Secure all cable connections and replace damaged cables. Add or correct bus termination resistors. Increase the communication watchdog timeout in the WinCC flexible project if the PLC cycle time is long. Reduce bus cable length if signal quality is poor.

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