Siemens 6AV6355-1AA47-7CK3 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7CK3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CK3 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 interface for monitoring and controlling industrial processes. This unit is part of the SIMATIC HMI product line, which is widely deployed across automation environments requiring reliable and rugged operator interaction.

The OP 77A features a monochrome LCD display and a membrane keypad for navigation and data entry, making it suitable for environments where touchscreen operation is not required. It supports the MPI (Multi-Point Interface) and PROFIBUS DP communication protocols, enabling direct integration with Siemens S7-200, S7-300, and S7-400 PLCs. Configuration is performed using Siemens WinCC flexible software, and the panel includes onboard flash memory for storing project data and recipes. The unit operates on a 24 V DC supply and is built to meet industrial environmental standards.

The OP 77A is commonly used in machine building, manufacturing automation, and process control applications where a cost-effective and compact operator interface is required. It is well suited for installation in control cabinet doors or machine panels, providing local operator access to process parameters, alarms, and setpoints. Industries such as automotive, food and beverage, packaging, and general manufacturing frequently deploy this panel for machine-level HMI tasks.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	Max. 5 W
Communication Interface	MPI, PROFIBUS DP
Configuration Software	WinCC flexible 2005 or higher
Memory	512 KB flash (user memory)
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 HMI 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 match the project configuration. Ensure the PLC is in RUN mode.
Event ID: 10001: Connection to the configured PLC has been interrupted during operation.
Inspect communication cables for damage or loose connectors. Verify network topology and bus termination. Restart both the HMI panel and the PLC if the connection is not restored automatically.
Event ID: 20000: Project download error. The project transfer from the configuration PC to the HMI panel has failed.
Check the transfer cable connection and ensure the correct COM port or network interface is selected in WinCC flexible. Verify that the panel is in transfer mode before initiating download.
Event ID: 40000: Tag read error. The HMI panel is unable to read the value of a configured tag from the PLC.
Verify that the tag address in the WinCC flexible project matches the actual PLC memory address. Check that the PLC program is running and the relevant data blocks or memory areas are accessible.
Event ID: 40001: Tag write error. The HMI panel is unable to write a value to the configured PLC tag.
Confirm the tag address is correct and that the PLC memory area is not write-protected. Check communication link integrity and PLC operating mode.
System Error: Internal panel system error or firmware fault detected during startup or operation.
Perform a panel reset by cycling power. If the error persists, reload the project using WinCC flexible. In case of repeated failures, consider a firmware update or panel replacement.
Transfer Mode Active: The panel is in transfer mode and is waiting for a project download from the configuration PC.
Initiate the project transfer from WinCC flexible, or press the appropriate key combination on the panel to exit transfer mode and return to normal operation.

Frequently Asked Questions

Which PLCs are compatible with the Siemens OP 77A (6AV6355-1AA47-7CK3)?

The OP 77A is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It can also communicate with S7-200 via the PPI protocol depending on configuration.

What software is required to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later version. Projects are created on a PC and transferred to the panel via a serial or MPI connection.

What is the supply voltage for the 6AV6355-1AA47-7CK3?

The panel requires a 24 V DC power supply. Ensure the 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 resistant to dust and water jets, suitable for installation in industrial cabinet doors.

Can the OP 77A display graphics or images?

No, the OP 77A uses a character-based monochrome LCD display and does not support graphical or bitmap image display. It is intended for text-based process data visualization.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the power connector. Verify the supply is within the correct voltage range and that the connector is firmly seated.

Restore correct supply voltage if out of range. If voltage is correct and display remains blank, inspect internal fuse if accessible, or replace the panel as the internal power circuit may have failed.

HMI panel cannot communicate with the PLC

Verify MPI or PROFIBUS DP cable connections at both the panel and PLC ends. Check bus termination at both ends of the network segment and confirm the panel address in the project matches the physical setting.

Replace or reseat communication cables. Correct the bus termination using appropriate resistors or termination plugs. Adjust the panel or PLC address settings in WinCC flexible to match the physical configuration.

Project transfer from PC to panel fails

Confirm the panel is in transfer mode. Check the transfer cable type and the COM port or interface selected in WinCC flexible. Ensure no firewall or driver issue is blocking communication on the PC.

Switch the panel to transfer mode via the system menu. Use the correct Siemens PC adapter cable and install the appropriate drivers. Retry the transfer from WinCC flexible with the correct interface settings selected.

Alarm messages appear continuously on the display

Review the active alarm list on the panel and identify the alarm tag addresses. Cross-reference these addresses with the PLC program to determine which process conditions are triggering the alarms.

Resolve the underlying process condition causing the alarm in the PLC program. If alarms are spurious, verify the tag addresses and alarm limits configured in the WinCC flexible project are correct.

Panel keys are unresponsive or intermittently responsive

Inspect the membrane keypad for physical damage, contamination, or wear. Test each key systematically to identify whether the issue is isolated to specific keys or affects the entire keypad.

Clean the keypad surface with a dry cloth. If specific keys are physically damaged or the membrane is worn through, the keypad membrane or the entire panel front unit may need to be replaced.

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