Siemens 6AV6355-1AA47-7BE2 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7BE2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7BE2 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. It is a compact, key-operated operator panel designed for machine-level human-machine interface applications, providing a straightforward interface for process monitoring and control. The OP 77A is part of the SIMATIC HMI Basic Panels generation and is intended for use with Siemens SIMATIC S7 and other compatible controllers.

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 a touchscreen. It supports MPI and PROFIBUS DP communication interfaces for direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and offers a compact, panel-mount design with an IP65 protection rating on the front face, making it suitable for industrial environments.

The OP 77A is widely deployed in manufacturing, machine building, and process automation applications where a cost-effective, robust operator interface is required at the machine level. It is commonly found on packaging machines, conveyor systems, and general-purpose industrial machinery where operators need to monitor process values, acknowledge alarms, and adjust setpoints without requiring a full graphical touchscreen panel.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	3.5 W (typical)
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 mount
Configuration Software	WinCC flexible 2005 or higher
Certifications	CE, UL, cULus
Series/Product Family	SIMATIC HMI OP 77A

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 terminating resistors. Verify the PLC address and baud rate settings match the panel configuration in WinCC flexible.
Event ID: 10001: Connection to the PLC has been interrupted during operation.
Inspect the communication cable for damage or loose connectors. Verify the PLC is powered and in RUN mode. Check network topology and bus termination.
Event ID: 20000: Configuration error detected. The project loaded on the panel is incompatible or corrupt.
Re-download the project from WinCC flexible to the panel. Ensure the WinCC flexible version matches 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 entries. Consider simplifying the project or reducing alarm buffer size in WinCC flexible configuration.
Event ID: 50000: Firmware update error. A firmware transfer to the panel was interrupted or failed.
Repeat the firmware update procedure using the correct firmware version for the OP 77A. Ensure stable power supply during the update process.
Event ID: 60000: Internal device error. A hardware fault has been detected within the panel.
Cycle power to the panel. If the error persists, the panel may require repair or replacement of internal components.
Event ID: 70000: Tag update error. One or more process tags cannot be read from or written to the PLC.
Verify the PLC data block addresses referenced in the WinCC flexible project are correct and accessible. Check PLC program for address conflicts.

Frequently Asked Questions

Which PLCs are compatible with the Siemens OP 77A (6AV6355-1AA47-7BE2)?

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 connect to S7-200 via PPI protocol.

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 or a PC/PPI cable.

What is the supply voltage for the 6AV6355-1AA47-7BE2?

The panel operates on 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 face 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.

Can the OP 77A display graphical images or only text?

The OP 77A is a character-based operator panel and displays text and numeric values only. It does not support graphical or bitmap image display, unlike touchscreen HMI panels in the SIMATIC Comfort or Basic Panel ranges.

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 incorrect wiring.

Restore correct 24 V DC supply. If voltage is confirmed correct and the display remains blank, the internal power supply or display unit may be faulty and the panel should be sent for repair.

Panel shows communication error immediately after startup

Verify the MPI or PROFIBUS DP address configured in WinCC flexible matches the address set on the panel. Check that the communication cable is correctly connected and bus termination is applied at both ends of the network.

Correct the address settings in WinCC flexible and re-download the project. Replace the communication cable if continuity testing reveals a fault. Ensure only the two physical ends of the bus have terminating resistors enabled.

Function keys do not respond to presses

Inspect the membrane keypad for physical damage, contamination, or deformation. Test each key in the panel's built-in service menu if accessible.

Clean the keypad surface with a dry cloth. If keys are mechanically damaged or the membrane is torn, the keypad membrane assembly requires replacement.

Project download from WinCC flexible fails

Check the PC-to-panel communication cable (MPI or PC/PPI adapter). Verify the correct COM port and transfer settings are selected in WinCC flexible. Confirm the panel is in transfer mode.

Switch the panel to transfer mode manually via the panel menu. Replace the communication cable or adapter if the connection cannot be established. Ensure WinCC flexible version is compatible with the panel firmware.

Alarm messages are not displayed on the panel

Verify that alarm tags in the WinCC flexible project are correctly mapped to the corresponding PLC data addresses. Check that the PLC program is writing the expected values to the alarm trigger bits.

Correct any address mismatches in the WinCC flexible alarm configuration and re-download the project. Confirm PLC logic is functioning correctly by monitoring the relevant data addresses online.

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