Siemens 6AV6355-1AA47-7CF1 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7CF1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CF1 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 operators with a straightforward interface for monitoring and controlling industrial processes. It is a key-operated panel without a touchscreen, relying on membrane keys for navigation and input.

The OP 77A features a monochrome LCD display and is equipped with communication interfaces compatible with PROFIBUS DP and MPI, enabling integration into Siemens SIMATIC automation environments. The panel supports configuration via Siemens WinCC flexible software, allowing engineers to define screens, alarms, and recipes. It operates on a 24 V DC supply and is built to withstand typical industrial environments, with a front panel protection rating of IP65.

The OP 77A is widely used in manufacturing, machine building, and process automation industries where a cost-effective, reliable operator interface is required at the machine level. It is particularly suited for applications involving SIMATIC S7-200, S7-300, and S7-400 PLCs, as well as SIMATIC 505 controllers. Its compact form factor and robust membrane keypad make it appropriate for panel mounting in control cabinets and machine enclosures.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.5 W
Communication Interface	PROFIBUS DP, MPI
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
Configuration Software	WinCC flexible 2005 or higher
Certifications	CE, UL
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes and System Events

Event ID: 10000: Configuration error detected on the operator panel during startup or runtime.
Check the project configuration in WinCC flexible and re-download the project to the panel. Verify compatibility between the panel firmware and the configuration software version.
Event ID: 20000: Communication error between the HMI panel and the connected PLC or controller.
Check PROFIBUS DP or MPI cable connections and termination resistors. Verify the configured bus address and baud rate match the PLC settings.
Event ID: 40000: Tag read/write error — the panel cannot access a configured PLC tag.
Verify the tag address in the WinCC flexible project matches the actual PLC memory address. Check that the PLC program is running and the data block or memory area exists.
Event ID: 50000: Alarm buffer overflow — the number of pending alarms exceeds the panel buffer capacity.
Acknowledge and clear existing alarms. Review the alarm configuration in WinCC flexible to reduce unnecessary alarm triggers or increase acknowledgement frequency.
Event ID: 70000: Firmware or operating system error detected on the panel.
Perform a panel reset. If the error persists, update the panel firmware using the Siemens ProSave tool or re-flash the operating system.
Event ID: 80000: Project download error — transfer of the WinCC flexible project to the panel failed.
Check the data transfer cable or PROFIBUS/MPI connection used for download. Ensure the panel is in transfer mode and that the correct communication settings are configured in WinCC flexible.

Frequently Asked Questions

What communication interfaces does the OP 77A (6AV6355-1AA47-7CF1) support?

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

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later version. Projects are created on a PC and downloaded to the panel via MPI or PROFIBUS DP.

What is the supply voltage for the 6AV6355-1AA47-7CF1?

The panel operates on a 24 V DC supply voltage, which is standard for SIMATIC HMI devices in industrial control cabinet installations.

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 resistant to dust ingress and low-pressure water jets, suitable for typical industrial machine environments.

Is the OP 77A compatible with S7-1200 or S7-1500 PLCs?

The OP 77A is primarily designed for use with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. Compatibility with S7-1200 or S7-1500 is not standard and would require careful verification of communication protocol support.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel power connector. Check for blown fuses or wiring faults in the supply circuit.

Restore correct 24 V DC supply. If voltage is present and the display remains blank, the internal power supply or LCD backlight may have failed and the unit should be sent for repair or replacement.

Panel shows communication error and cannot connect to PLC

Inspect the PROFIBUS DP or MPI cable for damage, loose connectors, or missing bus termination. Verify the bus address configured on the panel matches the address set in the PLC project.

Replace or reseat the communication cable, ensure correct bus termination at both ends of the network, and confirm matching baud rate and address settings in both the HMI project and PLC configuration.

Project download from WinCC flexible fails or times out

Check that the panel is set to transfer mode before initiating the download. Verify the PC communication settings (COM port or USB-to-MPI adapter) are correctly configured in WinCC flexible.

Set the panel to transfer mode via the panel menu, confirm the correct communication interface and baud rate in WinCC flexible, and retry the download. Replace the MPI/PROFIBUS cable or adapter if the issue persists.

Membrane keys are unresponsive or register incorrect inputs

Inspect the membrane keypad for physical damage, contamination, or deformation. Test each key systematically using the panel's built-in key test function if available.

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 fails to complete boot sequence

Check the supply voltage stability under load. Inspect for firmware corruption by observing the boot screen messages or error codes displayed during startup.

Stabilise the 24 V DC supply and ensure it meets the panel's current requirements. If firmware corruption is suspected, use the Siemens ProSave tool to restore or update the panel firmware.

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