Siemens 6AV6355-1AA47-7ET1 OP 77A

€ 2.495,00

SKU: 6AV6355-1AA47-7ET1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7ET1 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. It is a compact, key-operated operator panel designed for machine-level human-machine interface applications, providing operators with a straightforward means of monitoring and controlling industrial processes. This unit is part of the SIMATIC HMI Basic Panels generation, intended for use with Siemens SIMATIC S7 PLCs and compatible controllers.

The OP 77A features a monochrome LCD display and a membrane keypad with function keys, system keys, and numeric entry keys, enabling reliable operator input without a touchscreen. It supports the MPI and PROFIBUS DP communication interfaces for direct integration into Siemens automation networks. The panel is configured using WinCC flexible software and offers sufficient tag memory and screen objects for straightforward machine-level HMI tasks. The unit is built for panel mounting with a robust front face rated to IP65, suitable for industrial environments.

The OP 77A is widely deployed in manufacturing, packaging, and process automation applications where a cost-effective, reliable operator interface is required at the machine level. It is particularly suited for retrofitting older SIMATIC-based systems or for new installations where a simple, durable keypad-based HMI is preferred over a touchscreen solution. Industries such as food and beverage, automotive assembly, and general factory automation commonly use this panel for local operator control stations.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.8 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
Configuration Software	WinCC flexible 2005 or higher
Certifications	CE, UL, cULus
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Connection to the PLC could not be established or was interrupted.
Check MPI/PROFIBUS DP cable connections and terminating resistors. Verify PLC address settings match the HMI configuration in WinCC flexible.
Event ID: 10001: Communication timeout with the configured PLC controller.
Verify the PLC is in RUN mode and the network baud rate settings are consistent across all devices on the bus.
Event ID: 20000: Project download failed or project data is corrupted.
Re-download the project from WinCC flexible to the panel. Ensure the WinCC flexible version is compatible with the panel firmware version.
Event ID: 40000: Operator panel memory is full; no further data logging possible.
Clear the data log memory on the panel or reduce the number of logged tags and events in the WinCC flexible project configuration.
Event ID: 50000: Firmware version mismatch between the panel and the loaded project.
Update the panel firmware using ProSave or WinCC flexible to match the version required by the project, then re-download the project.
Event ID: 70000: Panel configuration error detected at startup; project cannot be loaded.
Perform a factory reset of the panel using the Service menu, then re-download the project from WinCC flexible.

Frequently Asked Questions

What communication interfaces does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP interfaces, allowing direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs without additional communication modules.

What software is required to configure the 6AV6355-1AA47-7ET1?

The panel is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are downloaded to the panel via the MPI interface or a PC adapter cable.

What is the supply voltage for this operator panel?

The OP 77A requires a 24 V DC supply voltage for operation.

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

The front face of the OP 77A carries an IP65 protection rating, making it suitable for environments with dust and water spray, though the rear of the unit is only rated IP20.

Can the OP 77A be used as a replacement for older SIMATIC OP7 or OP17 panels?

The OP 77A is designed as a successor to earlier SIMATIC operator panels such as the OP7 and OP17, and can often be used as a replacement with appropriate project migration in WinCC flexible.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel power connector. Check the polarity of the supply connections and inspect for any blown fuses in the supply circuit.

Correct any wiring errors or supply voltage issues. If the supply voltage is confirmed correct and the display remains blank, the internal power supply or display unit may be faulty and the panel should be sent for repair or replacement.

Panel displays 'No connection to PLC' or communication error at startup

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

Correct cable connections and termination. Ensure the PLC address and baud rate configured in WinCC flexible match the actual PLC settings. Replace the communication cable if continuity testing reveals a fault.

Project download from WinCC flexible fails or is interrupted

Check the PC adapter cable connection between the engineering PC and the panel MPI port. Verify that the correct COM port and transfer speed are selected in WinCC flexible transfer settings.

Use a known-good PC adapter cable and set the transfer baud rate to 187.5 kbps or lower. Ensure no other software is occupying the COM port and retry the download.

Function keys do not respond or produce 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 available in the Service menu.

Clean the keypad surface with a dry cloth. If individual keys are unresponsive after cleaning, the membrane keypad assembly is likely worn or damaged and requires replacement.

Panel repeatedly restarts or enters a boot loop

Attempt to access the panel's Service menu during startup by pressing the appropriate key combination. Check whether a valid project is loaded and whether the firmware version is compatible with the project.

Perform a factory reset via the Service menu and re-download a compatible project from WinCC flexible. If the boot loop persists after a successful project download, the panel hardware may require professional repair.

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