Siemens 6AV6355-1AA47-7FA1 OP 77A

€ 1.710,82

SKU: 6AV6355-1AA47-7FA1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7FA1 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 keypad-based interface for machine monitoring and control, and is part of Siemens' established SIMATIC HMI product line. It is intended for use with Siemens SIMATIC S7 and other compatible PLC families via standard communication interfaces.

The OP 77A features a monochrome LCD display and a membrane keypad with function keys, system keys, and numeric entry capability, enabling operators to navigate screens, enter setpoints, and acknowledge alarms without a touchscreen. It supports MPI and PROFIBUS DP communication protocols for direct connection to SIMATIC S7-200, S7-300, and S7-400 controllers. The panel is configured using WinCC flexible software and supports recipe management, alarm logging, and trend display functions within its available memory.

The OP 77A is commonly deployed in machine-level control panels across manufacturing, packaging, and process industries where a robust, keypad-operated interface is preferred over touchscreen operation. Its compact form factor and panel-mount design make it suitable for integration into standard control cabinet doors and operator stations. The device is well-suited for applications requiring reliable operator interaction in environments with vibration, dust, or where gloved operation is necessary.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 inches
Keypad Type	Membrane keypad with function keys
Input Voltage	24 V DC
Power Consumption	Max. 5 W
Communication Interface	MPI, PROFIBUS DP
Configuration Software	WinCC flexible 2005 or higher
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90%, non-condensing
IP Rating (Front)	IP65
IP Rating (Rear)	IP20
Mounting	Panel mounting
Certifications	CE, UL

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 MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect communication cables for damage or loose connectors. Check for address conflicts on the MPI or PROFIBUS network. Restart both the HMI panel and the PLC if the connection is not restored automatically.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel successfully.
Verify the USB or MPI transfer cable is correctly connected. 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 data records stored on the device. Archive or delete old alarm logs and recipe data. Consider simplifying the project if the issue persists.
Event ID: 50000: Internal device error or hardware fault detected during self-test at startup.
Perform a panel reset by cycling power. If the fault persists, back up the project and perform a factory reset. Contact Siemens technical support or arrange for repair if the hardware fault is confirmed.
Event ID: 60000: Configuration error detected. The loaded project is incompatible with the current panel firmware version.
Update the panel firmware to match the version required by the WinCC flexible project. Alternatively, recompile and re-download the project using a compatible version of WinCC flexible.
Event ID: 70000: Alarm buffer overflow. The number of pending or logged alarms has exceeded the buffer capacity.
Acknowledge and clear active alarms on the panel. Archive alarm logs and reduce the alarm buffer size in the WinCC flexible project configuration if overflow occurs frequently.

Frequently Asked Questions

Which communication protocols does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP communication protocols, allowing direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs.

Which software is used to configure the Siemens 6AV6355-1AA47-7FA1?

The panel is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are compiled in WinCC flexible and transferred to the panel via MPI or USB transfer cable.

What is the supply voltage for this operator panel?

The OP 77A operates on a 24 V DC supply voltage.

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

The OP 77A is primarily designed for use with S7-200, S7-300, and S7-400 controllers via MPI and PROFIBUS DP. Compatibility with S7-1200 or S7-1500 is limited and these newer controllers are better paired with more recent SIMATIC HMI panels.

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 suitable for environments with dust and water spray when correctly installed in a panel cutout.

Troubleshooting

Display remains blank after power is applied

Check the 24 V DC supply voltage at the panel power connector using a multimeter. Verify that the supply is within the specified range and that polarity is correct.

Correct any wiring errors or supply voltage issues. If the supply is confirmed good and the display remains blank, the internal power supply or display backlight may have failed and the unit should be sent for repair.

Panel cannot connect to the PLC via MPI or PROFIBUS DP

Verify the communication cable is correctly wired and terminated. Check that the MPI or PROFIBUS address configured in the WinCC flexible project matches the address set on the PLC. Confirm the baud rate settings are consistent across all network nodes.

Correct any address or baud rate mismatches in the project configuration and re-download. Replace the communication cable if continuity testing reveals a fault. Ensure bus termination resistors are present at both ends of the network.

Keypad buttons are unresponsive or intermittently fail

Inspect the membrane keypad surface for physical damage, contamination, or deformation. Test individual keys in the panel's built-in key test mode if available.

Clean the keypad surface with a dry cloth. If individual keys have failed due to wear or damage, the membrane keypad assembly should be replaced. This typically requires professional repair or unit exchange.

Project download fails or transfer is interrupted

Check the transfer cable connection between the programming PC and the panel. Verify the panel is in transfer mode and that the correct transfer channel is selected in WinCC flexible. Confirm the project compiles without errors.

Restart the panel in transfer mode and retry the download. Use a known-good transfer cable. Ensure the WinCC flexible version on the PC is compatible with the panel firmware version. Update firmware if a version mismatch is identified.

Alarm messages are displayed in incorrect language or with garbled text

Check the language settings within the WinCC flexible project. Verify that the correct language pack is loaded and that the active language index is set correctly in the project runtime settings.

Recompile the project with the correct language configuration and re-download to the panel. Ensure that all alarm text entries are correctly entered in the target language within the WinCC flexible editor.

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