Siemens 6AV6355-1AA47-7EN0 OP 77A

€ 386,38

SKU: 6AV6355-1AA47-7EN0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EN0 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for human-machine interface applications in industrial automation environments. This compact panel provides a key-based operator interface for monitoring and controlling machine processes, and is part of Siemens' established SIMATIC HMI product line. It is intended for use as a front-panel mounted operator terminal connected to Siemens PLCs and compatible controllers.

The OP 77A features a monochrome LCD display and a membrane keypad with function keys, system keys, and numeric entry capability, enabling structured operator interaction without a touchscreen. It supports communication via MPI and PROFIBUS DP interfaces, allowing direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. Configuration is performed using Siemens WinCC flexible software, and the panel supports alarm management, recipe handling, and simple process value display functions.

The OP 77A is commonly deployed in machine building, packaging machinery, conveyor systems, and general factory automation where a cost-effective, robust operator interface is required. Its compact form factor and keypad-based operation make it suitable for environments where touchscreen panels are impractical due to glove use or contamination. The panel is well-suited for applications requiring straightforward process monitoring and parameter entry at the machine level.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 inches
Display Colors	Monochrome (STN)
Input/Operating Voltage	24 V DC
Communication Interface	MPI, PROFIBUS DP
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
IP Protection Rating	IP65 (front panel)
Mounting	Panel mounting
Series/Product Family	SIMATIC HMI OP 77A
Configuration Software	WinCC flexible 2005 or later

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 to the configured controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the configuration in WinCC flexible. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect the communication cable for damage. Check bus termination and cable shielding. Verify PLC is operational and network address conflicts are absent.
Event ID: 20000: Configuration download error. The project data could not be transferred to the panel successfully.
Verify the transfer cable connection and PC communication settings. Ensure WinCC flexible project is compiled without errors before transfer. Check available memory on the panel.
Event ID: 40000: System memory low. The panel is running low on available runtime memory.
Reduce the number of active alarms or recipe entries. Simplify the project configuration and reload the project to the panel.
Event ID: 70010: Alarm buffer overflow. The number of pending alarms has exceeded the buffer capacity.
Acknowledge and clear existing alarms. Review the alarm configuration to reduce simultaneous alarm occurrences. Increase alarm buffer size in WinCC flexible project settings if possible.
Event ID: 50000: Recipe data error. A recipe record could not be read or written correctly.
Check recipe configuration in WinCC flexible. Verify PLC data block addresses referenced by recipes are correct and accessible. Re-download the project if configuration changes were made.
Event ID: 60000: Operator panel hardware fault detected. An internal self-test has identified a hardware issue.
Perform a panel restart. If the fault persists, the panel may require repair or replacement. Contact Siemens technical support or a qualified repair facility.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7EN0)?

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

What software is required to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are compiled and downloaded to the panel via a PC adapter or MPI/USB cable.

What is the supply voltage for the 6AV6355-1AA47-7EN0?

The panel operates on a 24 V DC supply voltage, which is the standard supply for SIMATIC HMI operator panels.

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

The OP 77A provides IP65 protection at the front panel when correctly installed in a panel cutout with the supplied seal, making it suitable for environments with dust and water spray.

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

Yes, the OP 77A supports basic alarm management including alarm display and acknowledgement, as well as recipe handling for parameter entry and storage, configurable via WinCC flexible.

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 the specified voltage range and that the connector is properly seated.

Restore correct 24 V DC supply voltage. If supply is confirmed correct and display remains blank, the internal power supply or display backlight may have failed, requiring panel repair or replacement.

Panel cannot communicate with the PLC

Verify MPI or PROFIBUS DP cable connections at both the panel and PLC. Check that bus termination resistors are correctly placed at both ends of the network. Confirm the PLC address in the WinCC flexible project matches the actual PLC configuration.

Replace or reseat communication cables. Correct address settings in the WinCC flexible project and re-download. Ensure only one bus termination is active at each network end.

Project download fails from PC to panel

Check the PC adapter or MPI/USB cable connection. Verify the panel is in transfer mode and that the correct communication port and baud rate are selected in WinCC flexible transfer settings.

Place the panel in transfer mode manually via the Start Center menu. Confirm PC adapter drivers are installed correctly. Re-attempt the download with matching baud rate settings on both PC and panel.

Function keys do not respond to presses

Inspect the membrane keypad for physical damage or contamination beneath the keys. Test individual keys in the panel's Start Center or a diagnostic screen if available.

Clean the keypad surface. If keys remain unresponsive, the membrane keypad assembly may be damaged and requires replacement by a qualified repair technician.

Alarms are displayed but cannot be acknowledged

Check the alarm configuration in WinCC flexible to confirm acknowledgement is enabled for the relevant alarm class. Verify the PLC bit associated with alarm acknowledgement is accessible and writable.

Correct the alarm class acknowledgement settings in the WinCC flexible project and re-download. Ensure the PLC program is not blocking the acknowledgement bit. Confirm operator has the required authorization level if user administration is active.

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