Siemens 6AV6355-1AA47-7EK2 OP 77A

€ 1.722,53

SKU: 6AV6355-1AA47-7EK2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EK2 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 industrial processes. The OP 77A series sits within Siemens' broader SIMATIC HMI product line, offering a cost-effective solution for basic visualization tasks.

The OP 77A features a monochrome LCD display and a membrane keypad with function keys, system keys, and numeric entry keys for operator input. It supports the MPI and PROFIBUS DP communication interfaces, enabling direct integration with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using Siemens WinCC flexible software and supports alarm management, recipe handling, and simple process value display. It operates on a 24 V DC supply and is built to withstand typical industrial environments with a front panel protection rating of IP65.

The OP 77A is widely deployed in manufacturing, packaging, and machine tool industries where a compact, reliable operator interface is required at the machine level. Its compatibility with the SIMATIC S7 controller family makes it a natural fit for existing Siemens automation architectures. The panel is particularly suited for applications requiring straightforward parameter entry, alarm acknowledgment, and status monitoring without the need for a full graphical touchscreen interface.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.5 W
Communication Interface	MPI, PROFIBUS DP
Configuration Software	WinCC flexible 2005 or higher
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
Certifications	CE, UL, cULus
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400

Common Error Codes & System Events

Event ID: 10000: Configuration error: The project loaded on the panel is incompatible or corrupt.
Reload the project using WinCC flexible. Verify the project was compiled without errors before transferring.
Event ID: 20000: Communication error: Connection to the configured PLC cannot be established.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration.
Event ID: 40000: Tag read error: A configured tag cannot be read from the PLC.
Verify the tag address exists in the PLC program. Check that the PLC is in RUN mode and the communication link is active.
Event ID: 40001: Tag write error: A value cannot be written to the configured PLC tag.
Check that the PLC tag address is correct and the PLC is not write-protected. Verify the data type matches the configured tag.
Event ID: 50000: System memory low: Available panel memory is insufficient for the current project.
Reduce the project size by removing unused screens, alarms, or recipes. Transfer a simplified project to the panel.
Event ID: 60000: Transfer mode active: The panel is waiting for a project transfer from the configuration PC.
Transfer the project from WinCC flexible or press ESC on the panel keypad to exit transfer mode and return to normal operation.
Event ID: 70000: Operating system error: An internal system fault has been detected.
Perform a power cycle on the panel. If the fault persists, perform a factory reset and reload the project.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

The OP 77A is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with certain third-party controllers when configured appropriately in WinCC flexible.

What software is used to configure the 6AV6355-1AA47-7EK2?

The panel is configured using Siemens WinCC flexible 2005 or a later version. Projects are compiled and transferred to the panel via a PC adapter or MPI/PROFIBUS connection.

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 ingress and low-pressure water jets, suitable for typical industrial machine environments.

Does the OP 77A support recipe management?

Yes, the OP 77A supports basic recipe management, allowing operators to store and transfer sets of process parameters between the panel and the connected PLC.

What is the supply voltage for the 6AV6355-1AA47-7EK2?

The panel operates on a 24 V DC supply voltage, which is standard for SIMATIC HMI devices and compatible with typical industrial control cabinet power supplies.

Troubleshooting

Display remains blank after power on

Check that 24 V DC is present at the power supply terminals of the panel. Inspect the supply cable and connector for damage or loose connections.

Restore the correct 24 V DC supply. If voltage is confirmed but the display remains blank, the internal power supply board or display unit may be faulty and require replacement.

Panel shows 'No connection to PLC' message continuously

Verify the MPI or PROFIBUS DP cable is correctly connected and terminated at both ends. Check that the PLC address configured in WinCC flexible matches the actual PLC station address.

Correct any wiring or termination issues. Adjust the PLC address and baud rate in the panel project if necessary, recompile, and retransfer the project.

Panel is stuck in transfer mode and will not start the project

The panel may have been interrupted during a project transfer or is configured to start in transfer mode. Check the startup settings in the panel's system menu.

Press ESC on the keypad to exit transfer mode, or perform a complete project transfer from WinCC flexible to overwrite the incomplete project on the panel.

Alarm messages are not appearing on the panel despite PLC fault conditions

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

Correct the alarm tag addresses in the WinCC flexible project, recompile, and retransfer. Confirm the PLC program is setting the alarm bits as expected during fault conditions.

Function keys do not respond when pressed

Inspect the membrane keypad for physical damage or contamination. Check whether the issue affects all keys or only specific ones, which may indicate a partial keypad failure.

Clean the keypad surface with a dry cloth. If keys remain unresponsive, the membrane keypad assembly may need to be replaced, as individual key contacts can wear out over time.

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