Siemens 6AV6355-1AA47-7CD3 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7CD3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CD3 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for human-machine interface applications in industrial automation environments. This unit is part of Siemens' compact operator panel lineup, providing a robust and reliable interface for machine-level control and monitoring. The OP 77A series is developed to integrate seamlessly within Siemens SIMATIC automation architectures.

The OP 77A features a monochrome LCD display with a resolution of 160 x 80 pixels and a keypad-based input interface, eliminating the need for a touchscreen while providing reliable tactile operation. It supports MPI and PROFIBUS DP communication interfaces, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel operates on a 24 V DC supply and is rated to IP65 on the front face, making it suitable for installation in control cabinet doors exposed to dust and water spray. Configuration is performed using WinCC flexible software.

The OP 77A is commonly deployed in machine-level operator stations across manufacturing, packaging, and process industries where a cost-effective, compact HMI solution is required. Its keypad-driven interface is well-suited for environments where touchscreen operation is impractical due to gloves, vibration, or contamination. The panel's compatibility with the SIMATIC S7 PLC family makes it a standard choice for retrofitting or extending existing Siemens automation systems.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Input Method	Membrane keypad
Input Voltage	24 V DC
Power Consumption	Max. 5 W
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 mounting
Certifications	CE, UL
Configuration Software	WinCC flexible

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.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings and ensure the PLC is in RUN mode.
Event ID: 10001: PLC is not responding or connection has been lost during operation.
Verify the physical communication cable integrity. Check PLC status and confirm the configured station address matches the PLC settings.
Event ID: 20000: Configuration download error. The project data could not be transferred to the panel.
Ensure the correct transfer cable is connected and WinCC flexible is configured with the correct communication parameters. Retry the download.
Event ID: 40000: Internal device error detected during self-test at startup.
Perform a factory reset of the panel. If the error persists, the unit may require repair or replacement.
Event ID: 50000: Incorrect or incompatible project file loaded onto the panel.
Reload the correct project file using WinCC flexible. Ensure the project was compiled for the OP 77A device type.
Event ID: 60000: Power supply voltage out of acceptable range detected by the panel.
Measure the 24 V DC supply at the panel connector. Ensure the supply is within the specified tolerance range and check for loose connections.

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 also supports connection to SIMATIC S7-200 via PPI protocol.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible software. Projects are compiled within WinCC flexible and downloaded to the panel via the appropriate transfer cable.

What is the supply voltage for the 6AV6355-1AA47-7CD3?

The panel requires a 24 V DC power supply. Ensure the supply is within the specified tolerance to guarantee reliable operation.

Is the OP 77A front panel rated for wash-down or dusty environments?

Yes, the front face of the OP 77A is rated to IP65, providing protection against dust ingress and water jets. The rear of the unit is rated IP20.

Does the OP 77A support touchscreen input?

No, the OP 77A uses a membrane keypad for operator input and does not feature a touchscreen. This makes it suitable for environments where gloves are worn or where contamination is a concern.

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 tolerance and that the connector is fully seated.

Restore correct supply voltage if out of range. If voltage is correct and display remains blank, the internal power supply or display backlight may be faulty and the unit should be sent for repair.

Panel cannot communicate with the PLC

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

Replace or reseat the communication cable. Confirm that the station address configured in the WinCC flexible project matches the PLC address. Ensure the PLC is powered and in RUN mode.

Project download fails from WinCC flexible

Check that the transfer cable is correctly connected and that the panel is set to transfer mode. Verify the communication settings in WinCC flexible match the panel configuration.

Set the panel to transfer mode via the Start Center menu. Confirm the correct COM port or USB interface is selected in WinCC flexible and retry the download.

Keypad buttons are unresponsive or intermittent

Inspect the membrane keypad surface for physical damage, contamination, or deformation. Test each key systematically using a diagnostic screen if available in the project.

Clean the keypad surface with a dry cloth. If keys remain unresponsive after cleaning, the membrane keypad assembly may be worn or damaged and should be replaced.

Panel repeatedly restarts or shows startup errors

Check the supply voltage for instability or voltage dips under load. Review the event log on the panel for specific event IDs that indicate the cause of the restart.

Stabilize the 24 V DC supply using a dedicated power supply unit. If restarts continue with a stable supply, reload the project file and perform a factory reset. If the issue persists, the unit requires hardware inspection.

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