Siemens 6AV6355-1AA47-7AA0 OP 77A

€ 1.141,69

SKU: 6AV6355-1AA47-7AA0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7AA0 is an operator panel belonging to the OP 77A series, part of the SIMATIC HMI product line from Siemens. This compact panel operator unit is designed for machine-level human-machine interface applications, providing a keypad-based interface for process monitoring and control. It is a member of the Micro Panel family, intended for straightforward visualization and operation tasks in industrial environments.

The OP 77A features a monochrome LCD display and a membrane keypad with function keys, system keys, and numeric entry capability. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration with SIMATIC S7 PLCs. Configuration is performed using WinCC flexible software, and the panel supports recipe management, alarm logging, and trend display functions within its onboard memory capacity.

The 6AV6355-1AA47-7AA0 is typically deployed in machine building, packaging, and manufacturing automation 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 control cabinets and machine panels where touchscreen operation is not required. Industries such as food and beverage, automotive supply, and general factory automation commonly utilize this panel for local operator interaction with SIMATIC-based control systems.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	3 W (typical)
Communication Interface	MPI, PROFIBUS DP
Configuration Software	WinCC flexible 2005 or higher
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
IP Protection Rating (Front)	IP65
IP Protection Rating (Rear)	IP20
Mounting	Panel mounting
Certifications	CE, UL, cULus
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes and System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC. The connection to the configured controller cannot be established or has been lost.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify PLC address settings match the HMI project configuration. Restart both the panel and the PLC.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect the communication cable for damage. Verify bus termination and cable shielding. Check PLC operational state and re-establish communication.
Event ID: 40000: System memory of the HMI panel is insufficient to load the configured project.
Reduce the project size by removing unused screens, alarms, or recipes. Transfer a revised project using WinCC flexible.
Event ID: 70010: Project transfer error. The project could not be successfully transferred to the panel.
Check the transfer cable or network connection. Ensure the correct transfer settings are configured in WinCC flexible. Retry the project download.
Event ID: 20000: Tag read error. A configured tag could not be read from the PLC.
Verify the tag address in the WinCC flexible project matches the actual PLC data block or memory address. Check PLC program for the corresponding variable.
Event ID: 20001: Tag write error. A value could not be written to the configured PLC tag.
Check write permissions for the tag in the PLC program. Verify the tag address and data type configuration in the HMI project.
Event ID: 60000: Operating system error on the HMI panel. An internal system fault has been detected.
Perform a panel restart. If the error persists, perform a factory reset and re-transfer the project. Contact Siemens technical support if the fault recurs.

Frequently Asked Questions

Which PLC families are compatible with the OP 77A (6AV6355-1AA47-7AA0)?

The OP 77A is primarily designed for use with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. Compatibility depends on the communication driver configured in the WinCC flexible project.

What software is required to configure and program this panel?

The panel is configured using Siemens WinCC flexible 2005 or a later version. The project is transferred to the panel via the MPI interface or a PC/PPI cable depending on the connection type.

What is the supply voltage for the 6AV6355-1AA47-7AA0?

The panel operates on a 24 V DC supply voltage. Ensure the power supply is within the specified tolerance range to prevent operational faults.

Does the OP 77A support recipe management and alarm functions?

Yes, the OP 77A supports recipe management, alarm logging, and simple trend display within the limits of its onboard memory and the WinCC flexible configuration.

What is the front panel protection rating of this unit?

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

Troubleshooting

Panel display remains blank after power is applied

Measure the 24 V DC supply voltage at the power connector. Check for correct polarity. Inspect the internal fuse if accessible.

Correct any wiring errors or supply voltage issues. Replace the power supply if voltage is absent. If supply is correct and display remains blank, the internal power supply board or display unit may require replacement.

Communication error displayed immediately after startup

Check the MPI or PROFIBUS DP cable connections at both the panel and PLC ends. Verify bus termination resistors are correctly placed at both ends of the bus segment.

Replace or reseat the communication cable. Correct the bus address settings in both the HMI project and the PLC configuration. Ensure only one active bus termination exists at each end of the segment.

Project transfer from WinCC flexible fails

Verify the transfer cable type and connection. Check that the panel is set to transfer mode. Confirm the PC communication port settings match the panel interface.

Switch the panel to transfer mode via the Start Center menu. Use the correct MPI or PC/PPI cable. Reinstall the WinCC flexible communication driver on the PC if the connection is not recognized.

Operator keys are unresponsive or register incorrect inputs

Inspect the membrane keypad for physical damage, contamination, or deformation. Check if the issue is consistent across all keys or isolated to specific keys.

Clean the keypad surface with a dry cloth. If individual keys are damaged or non-functional, the membrane keypad assembly should be replaced as a unit.

Panel repeatedly restarts or enters a boot loop

Check the 24 V DC supply for voltage fluctuations or drops under load. Inspect the project for configuration errors that may cause a runtime crash on startup.

Stabilize the power supply and ensure adequate current capacity. Transfer a verified project to the panel. If the issue persists without a project loaded, the panel firmware may be corrupted and require re-flashing or hardware service.

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