Siemens 6AV6355-1AA47-7EU1 OP 77A

€ 381,06

SKU: 6AV6355-1AA47-7EU1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EU1 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' SIMATIC HMI product line. It is intended for use with SIMATIC S7 PLCs and other compatible Siemens controllers.

The OP 77A features a monochrome LCD display with a resolution suitable for displaying process values, alarm messages, and status information. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration into Siemens automation networks. The panel is configured using WinCC flexible software and supports recipe management, alarm logging, and multilingual text display. Its robust housing is rated for industrial environments with an IP65 protection rating on the front panel.

The OP 77A is commonly deployed in machine-level control applications across manufacturing, packaging, food and beverage, and general industrial automation. Its keypad-based operation makes it suitable for environments where touchscreen interfaces are impractical due to operator glove use or harsh conditions. The compact form factor allows installation in confined control cabinet doors and machine panels where space is limited.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 inches
Communication Interface	MPI, PROFIBUS DP
Input/Operating Voltage	24 V DC
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
Mounting	Panel mounting
Certifications	CE, UL
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Connection to PLC interrupted or PLC not reachable on the configured interface
Check MPI or PROFIBUS DP cable connections, verify PLC address settings, and confirm the PLC is powered and in RUN mode
Event ID: 10001: Communication timeout between the HMI panel and the configured controller
Verify baud rate settings match between the OP 77A and the PLC, check cable integrity, and confirm correct station address configuration
Event ID: 20000: Project download failed or project data corrupted in the panel
Re-download the project from WinCC flexible, ensure the correct panel type is selected in the project, and check the transfer cable or communication link
Event ID: 40000: Tag read error — the panel cannot read the configured PLC tag or data block
Verify the tag address exists in the PLC program, confirm the data block is not write-protected, and check that the PLC program is loaded and active
Event ID: 40001: Tag write error — the panel cannot write a value to the configured PLC address
Check that the target PLC address is not read-only, confirm the PLC is in RUN mode, and verify the tag configuration in WinCC flexible
System Event: Configuration Error: Incompatible or missing project configuration detected on startup
Download a compatible project using WinCC flexible, ensuring the project is compiled for the OP 77A panel type
System Event: Power Supply Fault: Supply voltage outside the specified 24 V DC operating range
Measure the supply voltage at the panel connector and ensure it is within the 20.4–28.8 V DC tolerance range; check the power supply unit

Frequently Asked Questions

Which configuration software is required for the OP 77A?

The OP 77A is configured using Siemens WinCC flexible. The project must be compiled specifically for the OP 77A panel type before downloading.

What communication interfaces does the 6AV6355-1AA47-7EU1 support?

This panel supports MPI and PROFIBUS DP communication interfaces for direct connection to SIMATIC S7 PLCs and other compatible controllers.

What is the supply voltage for this operator panel?

The OP 77A operates on 24 V DC, typically within a tolerance range of 20.4 V DC to 28.8 V DC.

Is the OP 77A compatible with SIMATIC S7-300 and S7-400 PLCs?

Yes, the OP 77A is designed for use with SIMATIC S7-300 and S7-400 PLCs via MPI or PROFIBUS DP connections.

What is the front panel protection rating of this unit?

The front panel of the OP 77A carries an IP65 protection rating, making it suitable for environments where dust and water spray may be present.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Check for blown fuses in the supply circuit and inspect the power cable for damage.

Ensure the supply voltage is within the 20.4–28.8 V DC range. Replace any blown fuses and verify the power supply unit output. If the supply is correct and the display remains blank, the internal power supply or display backlight may require replacement.

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

Check the MPI or PROFIBUS DP cable connections at both the panel and the PLC. Verify the station address and baud rate configured in WinCC flexible match the PLC settings.

Reseat all communication cables, confirm correct bus termination resistors are in place, and ensure the PLC station address in the HMI project matches the physical PLC configuration. Reload the project if settings were changed.

Project download from WinCC flexible fails or transfer does not start

Confirm the panel is in Transfer mode. Check the communication cable between the PC and the panel, and verify the correct transfer channel is selected in WinCC flexible.

Set the panel to Transfer mode via the Start Center menu. Use the correct PC/PPI or MPI adapter cable, and ensure the COM port or USB adapter driver is correctly installed on the engineering PC.

Alarm messages are not displayed on the panel

Verify that alarm tags are correctly configured in WinCC flexible and that the corresponding PLC bit addresses are active. Check that the alarm view object is present on the relevant screen.

Review the alarm configuration in WinCC flexible, confirm PLC bit addresses match the alarm trigger tags, and re-download the project. Ensure the PLC program is setting the correct alarm bits.

Panel keys are unresponsive or function incorrectly

Check whether the issue is with all keys or specific keys. Inspect the keypad membrane for physical damage or contamination. Verify the project configuration for key assignments in WinCC flexible.

Clean the keypad area if contamination is present. If specific keys are physically damaged, the keypad membrane assembly may need replacement. If the issue is configuration-related, review and correct key assignments in the WinCC flexible project and re-download.

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