Siemens 6AV6355-1AA47-7EP1 OP 77A

€ 1.141,69

SKU: 6AV6355-1AA47-7EP1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EP1 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 automated processes. This unit is part of the SIMATIC HMI Basic Panels generation and is intended for use with Siemens SIMATIC S7 and other compatible controller families.

The OP 77A features a monochrome LCD display and a membrane keypad with function keys, enabling reliable operation in demanding industrial environments. It supports the MPI and PROFIBUS DP communication interfaces for direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using Siemens WinCC flexible software and offers a compact, panel-mount form factor with an IP65 protection rating on the front face, making it resistant to dust and water ingress. Internal memory supports the storage of tags, alarms, and recipes suitable for basic automation tasks.

The OP 77A is widely deployed in manufacturing, packaging, and process automation applications where a cost-effective, robust operator interface is required at the machine level. Its compatibility with the SIMATIC controller ecosystem makes it a practical choice for OEMs and system integrators building machinery in industries such as food and beverage, automotive, and general factory automation. The panel's compact dimensions allow integration into standard control cabinets and machine panels with minimal space requirements.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Keypad	Membrane keypad with function keys
Input/Operating Voltage	24 V DC
Power Consumption	3 W (typical)
Communication Interface	MPI, PROFIBUS DP
IP Protection Rating (Front)	IP65
IP Protection 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
Configuration Software	WinCC flexible 2005 or higher

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 panel configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Timeout error on the communication bus. The panel did not receive a response from the PLC within the expected time window.
Check bus cable integrity and shielding. Verify baud rate settings are consistent across all devices on the bus. Reduce bus length or check for cable damage.
Event ID: 20000: Configuration or project download error. The project data transferred to the panel is incompatible or corrupted.
Re-download the project from WinCC flexible. Ensure the WinCC flexible version is compatible with the OP 77A firmware version. Perform a factory reset if the issue persists.
Event ID: 40000: System memory error. The panel has detected an issue with its internal memory or stored project data.
Perform a complete project re-download. If the error persists, perform a factory reset via the panel's loader menu and re-transfer the project.
Event ID: 50000: Firmware update error. An error occurred during a firmware update procedure.
Retry the firmware update using the correct firmware package for the OP 77A. Ensure stable power supply during the update process. Do not interrupt the update once started.
Event ID: 60000: Alarm buffer overflow. The number of pending alarms has exceeded the panel's alarm buffer capacity.
Acknowledge and clear existing alarms on the panel. Review the alarm configuration in WinCC flexible to reduce the number of simultaneously active alarms or increase the buffer size if configurable.
Event ID: 70000: Recipe data error. An error occurred when reading or writing recipe data.
Check recipe configuration in WinCC flexible. Verify that the data types and tag assignments in the recipe match the PLC data blocks. Re-download the project if necessary.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7EP1)?

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 be connected to SIMATIC S7-200 via the PPI protocol.

What software is used to configure and program 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 the MPI interface or a PC adapter cable.

What is the supply voltage for the 6AV6355-1AA47-7EP1?

The panel operates on a 24 V DC supply voltage. Ensure the power supply is within the specified tolerance range to guarantee reliable 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 environments where dust and water splashing may occur.

Can the OP 77A display graphical content or images?

No, the OP 77A uses a character-based monochrome LCD display and does not support graphical images. It is designed for text-based process data display and operator input via function keys.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Check that the supply is within tolerance and that the connector is fully seated.

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

Panel cannot communicate with the PLC

Verify the MPI or PROFIBUS DP cable is correctly connected and that termination resistors are in place at both ends of the bus. Check that the PLC address configured in WinCC flexible matches the actual PLC station address.

Correct any address mismatches in the WinCC flexible project and re-download. Replace the bus cable if damaged. Ensure only one active bus termination exists at each end of the network segment.

Function keys do not respond to presses

Inspect the membrane keypad for physical damage, contamination, or deformation. Test each key systematically in the panel's loader menu if a key test function is available.

Clean the keypad surface with a dry cloth. If keys remain unresponsive, the membrane keypad assembly may need replacement. Contact a qualified repair technician to replace the keypad membrane.

Project download from WinCC flexible fails

Check the PC-to-panel connection cable and the COM port or USB adapter settings on the engineering PC. Verify that the panel is in transfer mode via the loader menu.

Switch the panel to transfer mode manually through the loader menu. Use a known-good MPI adapter cable. Ensure the WinCC flexible version is compatible with the OP 77A firmware and retry the download.

Alarms are not displayed on the panel

Check the alarm configuration in WinCC flexible to confirm that alarm tags are correctly linked to PLC data addresses. Verify that the PLC is writing the expected values to the alarm trigger bits.

Correct any tag address mismatches in the WinCC flexible project and re-download. Use the PLC's diagnostic tools to confirm that alarm bits are being set as expected during fault conditions.

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