Siemens 6AV6355-1AA47-7CK1 OP 77A

€ 1.051,26

SKU: 6AV6355-1AA47-7CK1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CK1 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens AG. This compact panel operator unit is designed for machine-level human-machine interface applications, providing a key-based interface for process visualization and control. It belongs to the SIMATIC HMI Basic Panels generation, intended for straightforward monitoring and control tasks in industrial environments.

The OP 77A features a monochrome LCD display and a membrane keypad with function keys, system keys, and numeric entry keys, enabling reliable operator input without touchscreen complexity. It supports the MPI and PROFIBUS DP communication interfaces for integration with SIMATIC S7 PLCs, and can be configured using WinCC flexible software. The panel operates on a 24 V DC supply and is built to withstand the demands of industrial environments, with a front panel protection rating of IP65.

The SIMATIC OP 77A is widely deployed in manufacturing, automotive, food and beverage, and general machine-building industries where a cost-effective, robust operator interface is required. It is particularly suited for applications where touchscreen operation is not necessary and where reliable key-based input is preferred, such as on machine control panels, conveyor systems, and packaging lines.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 inches
Display Colors	Monochrome (blue-mode)
Input/Operating Voltage	24 V DC
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: Communication error between the operator panel and the connected PLC. The panel cannot establish or maintain a connection.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings and ensure the PLC is in RUN mode.
Event ID: 10001: Connection to the configured PLC has been interrupted during operation.
Inspect the communication cable for damage. Verify bus termination and address configuration. Restart the panel and PLC if necessary.
Event ID: 20000: Project download error. The project could not be transferred to the panel.
Check the transfer cable connection and ensure the panel is in Transfer mode. Verify WinCC flexible project compatibility with the panel firmware version.
Event ID: 40000: System memory low. The panel is running low on available runtime memory.
Reduce the number of active alarms or logged data. Optimize the project to reduce memory usage and re-download the project.
Event ID: 50000: Internal device error detected. A hardware or firmware fault has occurred within the panel.
Perform a panel restart. If the error persists, update the panel firmware using ProSave. Contact Siemens support if the fault remains after firmware update.
Event ID: 60000: Configuration error. The loaded project contains settings incompatible with the panel hardware.
Verify the project was compiled for the correct panel type (OP 77A). Re-download a compatible project using WinCC flexible.
Event ID: 70000: Tag read/write error. A configured tag could not be read from or written to the PLC.
Check the PLC data block and address configuration in the WinCC flexible project. Ensure the PLC program contains the expected data areas.

Frequently Asked Questions

What communication interfaces does the OP 77A (6AV6355-1AA47-7CK1) 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 required to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are downloaded to the panel via MPI cable or PROFIBUS connection.

What is the supply voltage for the 6AV6355-1AA47-7CK1?

The panel requires a 24 V DC supply voltage. Ensure the power supply 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 suitable for environments where dust and water spray may be present.

Can the OP 77A be used with S7-1200 or S7-1500 PLCs?

The OP 77A is primarily designed for use with S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. Compatibility with S7-1200 or S7-1500 is limited and generally not recommended; newer SIMATIC Basic Panels with PROFINET support are advised for those controllers.

Troubleshooting

Display remains blank after power on

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

Restore correct 24 V DC supply. If voltage is correct and display remains blank, inspect the internal fuse and replace if blown. If the panel still does not power on, the internal power supply board may require replacement.

Panel cannot establish communication with the PLC

Verify the MPI or PROFIBUS DP cable is correctly connected and that bus termination resistors are properly set at both ends of the bus. Check that the panel address and PLC address are correctly configured in the WinCC flexible project.

Correct any address conflicts, ensure proper bus termination, and replace the communication cable if damaged. Re-download the project and restart both the panel and PLC.

Project download fails or transfer mode cannot be activated

Confirm the panel is set to Transfer mode before initiating the download from WinCC flexible. Check the PC-to-panel cable (MPI/PROFIBUS adapter) and driver installation on the engineering PC.

Set the panel to Transfer mode via the Start Center menu. Ensure the correct communication adapter and drivers are installed on the PC. Retry the download with WinCC flexible.

Function keys do not respond or produce incorrect input

Inspect the membrane keypad for physical damage or contamination beneath the keys. Test each key in the panel's Start Center diagnostics if available.

Clean the keypad surface carefully. If keys are physically damaged or unresponsive after cleaning, the membrane keypad assembly will need to be replaced.

Panel displays persistent communication timeout alarms during operation

Monitor the PROFIBUS or MPI bus for signal integrity issues. Check for loose connectors, excessive cable length beyond specification, or missing bus termination.

Secure all connectors, verify cable lengths are within PROFIBUS or MPI specifications, and ensure correct bus termination at both ends. Replace degraded cables as needed.

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