Siemens 6AV6355-1AA47-7DA4 OP 77A

€ 955,52

SKU: 6AV6355-1AA47-7DA4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7DA4 is an operator panel belonging to the OP 77A series within the Siemens SIMATIC HMI product family. It is a compact, key-operated operator panel designed for machine-level human-machine interface applications, providing operators with a straightforward interface for monitoring and controlling industrial processes. This unit is part of the SIMATIC HMI Basic Panels generation and is manufactured by Siemens AG.

The OP 77A features a monochrome STN LCD display with a resolution of 160 x 80 pixels and a backlit screen for readability in varying ambient light conditions. It supports communication via PROFIBUS DP and MPI interfaces, enabling integration with Siemens S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and offers a membrane keypad with function keys for operator input, with no touchscreen capability. It operates on a 24 V DC supply and is rated IP65 on the front face for protection against dust and water ingress.

The OP 77A is widely used in machine building, manufacturing automation, and process control applications where a cost-effective, robust operator interface is required. It is particularly suited for applications in the food and beverage, packaging, and general manufacturing industries where space is limited and a simple, reliable HMI solution is preferred. Its compact form factor and compatibility with the SIMATIC S7 controller family make it a practical choice for OEMs and system integrators building panel-mounted control systems.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
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)
Configuration Software	WinCC flexible 2005 or higher
Mounting	Panel mounting
Certifications	CE, UL
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC. The panel cannot establish or maintain a connection to the controller.
Check PROFIBUS DP or MPI cable connections and termination resistors. Verify the PLC address settings match the HMI project configuration. Restart both the PLC and the HMI panel.
Event ID: 10001: Connection to the PLC was interrupted during runtime operation.
Inspect the communication cable for damage or loose connectors. Verify the PLC is in RUN mode and the network address is correctly configured in WinCC flexible.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel.
Check the PC-to-panel transfer cable and communication settings. Ensure WinCC flexible version is compatible with the panel firmware. Retry the download after restarting the panel in transfer mode.
Event ID: 40000: System memory low. The panel's available memory for runtime operation is insufficient.
Reduce the number of active screens or variables in the project. Optimize the WinCC flexible project to reduce memory usage and re-download the project.
Event ID: 50000: Panel operating system error or firmware fault detected during startup.
Perform a panel reset by holding the appropriate key combination during power-on. If the fault persists, update the panel firmware using ProSave or WinCC flexible.
Event ID: 60000: Backlight failure or display fault. The display backlight has failed or is operating outside normal parameters.
Check the 24 V DC supply voltage at the panel connector. If the supply is correct, the backlight unit may require replacement or the panel may need to be sent for repair.
Event ID: 70000: Configuration error detected. The loaded project contains settings incompatible with the current panel hardware or firmware version.
Verify that the WinCC flexible project was compiled for the correct panel type (OP 77A). Re-compile and re-download the project after correcting any compatibility issues.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7DA4)?

The OP 77A is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with S7-200 via PPI protocol.

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 downloaded to the panel via a PC adapter cable or PROFIBUS connection.

What is the supply voltage for the 6AV6355-1AA47-7DA4?

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 touchscreen input?

No, the OP 77A does not have a touchscreen. Operator input is performed exclusively via the membrane keypad, which includes system keys and configurable function keys.

What is the front panel protection rating of the OP 77A?

The front face of the OP 77A is rated IP65, providing protection against dust ingress and low-pressure water jets, making it suitable for panel-mounting in industrial environments.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the panel power connector. Check whether the backlight is simply off or if the display itself is not initializing by observing any faint screen content.

Verify the 24 V DC supply is within tolerance. If the supply is correct and the display remains blank, attempt a firmware recovery using ProSave. If the backlight has failed, the panel will require hardware repair or replacement.

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

Check the PROFIBUS DP or MPI cable connections at both the panel and PLC ends. Verify bus termination is correctly applied at both ends of the network segment.

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

Project download fails or panel does not enter transfer mode

Confirm the panel is set to transfer mode either via the Start Center menu or by holding the appropriate key during boot. Check the PC adapter cable and COM/USB port settings on the engineering PC.

Restart the panel and manually select transfer mode from the Start Center. Verify the correct communication port and transfer speed are selected in WinCC flexible. Try a different PC adapter cable if the issue persists.

Function keys do not respond or produce incorrect actions

Check whether the issue is present in all operating screens or only specific ones. Review the WinCC flexible project to confirm function key assignments are correctly configured for the affected screens.

Re-download the project after verifying function key assignments in WinCC flexible. If keys are physically unresponsive, inspect the membrane keypad for damage and consider panel repair or replacement.

Panel repeatedly restarts or crashes during operation

Monitor the 24 V DC supply voltage for voltage dips or instability under load. Check the panel for overheating by measuring ambient temperature around the installation.

Stabilize the power supply by using a dedicated 24 V DC rail or adding a buffer capacitor module. Ensure the panel operating temperature does not exceed 50 °C and that ventilation around the unit is adequate. Update panel firmware if software faults are suspected.

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