Siemens 6AV6355-1AA47-7FA0 OP 77A

€ 1.014,03

SKU: 6AV6355-1AA47-7FA0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7FA0 is an operator panel belonging to the OP 77A series, part of the SIMATIC HMI product line. This compact panel is designed for machine-level operator control and monitoring tasks, offering a text-based display interface for straightforward process visualization. It is a Siemens product intended for integration into industrial control systems where a cost-effective and reliable HMI solution is required.

The OP 77A features a multi-line text display capable of showing process values, alarms, and operator prompts. It supports MPI and PROFIBUS DP communication interfaces, enabling direct connection to SIMATIC S7 PLCs. The unit operates on a 24 V DC supply and is built to withstand the demands of industrial environments, with a front panel protection rating suitable for panel mounting. Configuration is performed using Siemens WinCC flexible software.

The OP 77A is commonly deployed in manufacturing, machine building, and process automation applications where operators require a simple interface for parameter entry, status monitoring, and alarm acknowledgment. It is well suited for integration with SIMATIC S7-200, S7-300, and S7-400 controller families. Typical installations include conveyor systems, packaging machinery, and general-purpose industrial machines requiring a compact and cost-effective operator interface.

Technical Specifications

Display Type	STN LCD, text-based
Display Lines	4 lines
Characters per Line	20 characters
Input/Operating Voltage	24 V DC
Power Consumption	Approx. 4 W
Communication Interface	MPI, PROFIBUS DP
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
Configuration Software	WinCC flexible 2005 or higher
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes and 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 configuration in WinCC flexible. Ensure the PLC is powered and 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 bus termination and cable shielding. Restart the panel and PLC if the connection is not restored automatically.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel successfully.
Verify the PC-to-panel connection cable is correctly seated. Ensure WinCC flexible version is compatible with the panel firmware. Retry the download after restarting both the panel and the configuration PC.
Event ID: 40000: System memory error. The panel has detected an issue with internal memory during startup or operation.
Perform a factory reset of the panel and re-download the project. If the error persists, the internal memory may be faulty and the unit should be sent for repair or replacement.
Event ID: 50000: Firmware version mismatch. The firmware on the panel is not compatible with the downloaded project.
Update the panel firmware to the version required by the WinCC flexible project. Use the Siemens ProSave tool or WinCC flexible to perform the firmware update.
Event ID: 60000: Configuration error detected at startup. The panel cannot load the stored project due to a corrupted or missing configuration.
Re-download the project from WinCC flexible to the panel. Verify the project file integrity on the configuration PC before transferring.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

The OP 77A is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with certain SIMATIC S5 controllers 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 compatible version. Projects are created on a PC and downloaded to the panel via a PC/PPI or MPI cable.

What is the supply voltage for the 6AV6355-1AA47-7FA0?

The panel requires a 24 V DC supply voltage for operation.

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 panel-mount installations where dust and water spray protection is required.

Can the OP 77A display graphics or only text?

The OP 77A is a text-based operator panel and does not support graphical display. It is designed for alphanumeric text output, alarm messages, and parameter entry.

Troubleshooting

Display remains blank after power on

Check that 24 V DC supply voltage is present at the power connector. Measure voltage at the panel terminals to confirm correct polarity and adequate current supply.

Ensure the power supply provides stable 24 V DC within the specified tolerance. Replace the power supply or check wiring if voltage is absent or out of range. If voltage is correct, the internal power circuitry may be faulty and the unit may require repair.

Panel shows communication error and cannot connect to PLC

Verify the MPI or PROFIBUS DP address configured in the WinCC flexible project matches the address set on the PLC. Check physical cable connections and bus termination at both ends of the network.

Correct any address mismatches in the project configuration and re-download to the panel. Replace or reseat communication cables. Ensure bus termination resistors are enabled only at the two physical ends of the bus segment.

Project download fails or times out

Confirm the correct download cable type is being used and that the cable driver is properly installed on the PC. Check that the panel is in transfer mode before initiating the download.

Place the panel in transfer mode via the panel menu. Reinstall the PC adapter driver if necessary. Retry the download using WinCC flexible, ensuring no firewall or antivirus software is blocking the communication port.

Alarm messages are not displayed correctly or are missing

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

Correct any tag address mismatches in the WinCC flexible project and re-download the configuration. Test alarm triggering from the PLC side to confirm the correct bits are being set.

Panel restarts repeatedly or enters a boot loop

A corrupted project file or firmware issue may be causing the panel to fail during startup. Attempt to enter the panel's service menu during boot to access diagnostic options.

Perform a factory reset using the ProSave tool connected via the serial interface. Re-download a verified project file and, if necessary, update the panel firmware to the latest compatible version.

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