Siemens 6AV6355-1AA47-7CL2 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7CL2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CL2 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for machine-level human-machine interface applications. This compact panel provides a keypad-based interface for monitoring and controlling industrial automation systems. It is part of Siemens' SIMATIC HMI portfolio and is intended for use with SIMATIC S7 and other compatible PLC families.

The OP 77A features a monochrome LCD display with a resolution suitable for displaying process values, alarm messages, and status information. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration with SIMATIC S7-200, S7-300, and S7-400 controllers. The panel supports configuration through WinCC flexible software and includes function keys for operator input, along with LED indicators for status feedback.

The SIMATIC OP 77A is widely used in manufacturing, packaging, and process automation environments where a cost-effective, robust operator interface is required at the machine level. Its compact form factor and keypad-based operation make it suitable for panel mounting in control cabinets and machine enclosures where touchscreen operation is not required. Industries such as automotive, food and beverage, and general machine building commonly deploy this panel for local operator interaction.

Technical Specifications

Display Type	Monochrome LCD
Communication Interface	MPI, PROFIBUS DP
Input Voltage	24 V DC
Operating Temperature	0 °C to 50 °C
Storage Temperature	-20 °C to 60 °C
Relative Humidity	10 % to 90 % (non-condensing)
IP Protection Rating	IP65 (front panel)
Mounting	Panel mounting
Configuration Software	WinCC flexible
Series	SIMATIC HMI OP 77A
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Certifications	CE, UL

Common Error Codes and System Events

Event ID: 10000: Communication error between the OP panel and the connected PLC. The panel cannot establish or maintain a connection to the configured 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 PLC was interrupted during operation.
Inspect the communication cable for damage or loose connectors. Check bus termination and cable shielding. Restart the panel and PLC if the connection is not restored automatically.
Event ID: 20000: Configuration or project data on the panel is missing or corrupted.
Re-transfer the WinCC flexible project to the panel using a PC connection. Verify the project file integrity before transfer.
Event ID: 40000: System memory or internal resource limit reached.
Reduce the complexity of the project, including the number of variables, alarms, or screens. Re-transfer the optimized project to the panel.
Event ID: 50000: Alarm buffer overflow. The number of pending alarms exceeds the buffer capacity.
Acknowledge and clear existing alarms on the panel. Review the alarm configuration in WinCC flexible to reduce unnecessary alarm triggers.
Event ID: 70000: Operating system or firmware error detected on the panel.
Perform a panel reset. If the error persists, update the panel firmware using the appropriate Siemens ProSave tool or re-transfer the project.
Communication Error: No data exchange occurring between the OP 77A and the PLC despite physical connection being present.
Verify MPI/PROFIBUS address configuration on both the panel and PLC. Check for address conflicts on the bus. Use Siemens diagnostic tools to verify bus integrity.

Frequently Asked Questions

What communication interfaces does the OP 77A (6AV6355-1AA47-7CL2) support?

The OP 77A supports MPI and PROFIBUS DP communication interfaces, allowing direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible software. Projects are transferred to the panel via a PC connection.

What is the supply voltage for the 6AV6355-1AA47-7CL2?

The panel operates on a 24 V DC supply voltage.

What is the IP protection rating of the OP 77A?

The front panel of the OP 77A carries an IP65 protection rating, making it suitable for use in environments where dust and water spray may be present.

Can the OP 77A be used with third-party PLCs?

The OP 77A is primarily designed for use with Siemens SIMATIC S7 controllers via MPI or PROFIBUS DP. Compatibility with third-party PLCs depends on available WinCC flexible drivers and should be verified against the specific controller.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel power connector using a multimeter. Verify the supply is within the specified range and that the connector is properly seated.

Restore the correct 24 V DC supply. If voltage is present and the display remains blank, the internal power supply or display backlight may have failed, requiring panel repair or replacement.

Panel displays communication error and cannot connect to PLC

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

Correct any address mismatches in the WinCC flexible project and re-transfer to the panel. Replace damaged cables or connectors. Ensure bus termination resistors are correctly placed at both ends of the network.

Project transfer from PC to panel fails

Check the PC-to-panel connection cable and the selected communication port in WinCC flexible. Verify the panel is in transfer mode.

Place the panel in transfer mode via the panel's start menu. Use the correct transfer cable and verify the COM port or USB settings in WinCC flexible. Re-attempt the project transfer.

Function keys do not respond to operator input

Check whether the panel is in the correct operating mode and that the project has been successfully loaded. Inspect the keypad membrane for physical damage.

Re-transfer the WinCC flexible project to ensure key assignments are correctly configured. If the keypad membrane is physically damaged, the panel will require hardware repair or replacement.

Panel repeatedly restarts or enters a boot loop

This may indicate corrupted firmware or a failed project transfer. Observe the startup sequence to identify any error messages displayed during boot.

Use the Siemens ProSave tool to restore the panel firmware. After firmware restoration, re-transfer the WinCC flexible project. If the issue persists, the panel hardware may require professional repair.

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