Siemens 6AV6355-1AA47-7FA3 OP 77A

€ 2.495,00

SKU: 6AV6355-1AA47-7FA3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7FA3 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. It is a compact, key-operated panel designed for machine-level human-machine interface applications, providing operators with a straightforward interface for monitoring and controlling automated processes. This unit is part of the SIMATIC HMI Basic Panels generation, intended for use with Siemens SIMATIC S7 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 MPI and PROFIBUS DP communication interfaces for direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and offers a compact form factor suited for panel door mounting, with a protection rating of IP65 on the front face.

The OP 77A is widely deployed in manufacturing, machine building, and process automation environments where a cost-effective, robust operator interface is required. It is particularly suited for applications such as packaging machinery, conveyor systems, and general-purpose machine control where basic status display and parameter entry are the primary HMI requirements. Its compatibility with the established SIMATIC S7 ecosystem makes it a practical choice for system integrators working within existing Siemens automation architectures.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	4 W (typical)
Communication Interface	MPI, PROFIBUS DP
Configuration Software	WinCC flexible 2005 or higher
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
Certifications	CE, UL, cULus
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 MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the HMI project configuration. Confirm 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 or loose connectors. Check bus termination at both ends of the network. Verify PLC is operational and network addresses are correct.
Event ID: 40000: Project download error. The configuration project could not be transferred to the panel successfully.
Check the transfer cable connection between the engineering PC and the panel. Ensure the panel is in transfer mode and that the WinCC flexible project is compatible with the panel firmware version.
Event ID: 20000: Tag read error. The panel is unable to read a configured tag from the PLC.
Verify the PLC data block or memory address referenced by the tag exists and is accessible. Check that the PLC program is running and the address range is correct in the HMI project.
Event ID: 20001: Tag write error. The panel failed to write a value to the configured PLC tag.
Confirm the target PLC address is not write-protected. Check the data type consistency between the HMI tag configuration and the PLC variable. Verify communication link integrity.
Event ID: 50000: System memory low. The panel's available runtime memory is insufficient for the current project.
Reduce the number of active alarms, screens, or variables in the WinCC flexible project. Optimize the project to reduce memory usage and re-download to the panel.
Event ID: 60000: Firmware update error. The panel firmware update process was interrupted or failed.
Restart the firmware update procedure using the correct firmware version for the OP 77A. Ensure stable power supply during the update and use the correct ProSave or WinCC flexible tool.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7FA3)?

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

What is the supply voltage for the 6AV6355-1AA47-7FA3?

The panel requires a 24 V DC supply voltage for operation.

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

The front face of the OP 77A carries an IP65 protection rating, making it suitable for panel door mounting in environments with dust and water spray exposure.

Does the OP 77A support touchscreen input?

No, the OP 77A uses a membrane keypad with function keys, system keys, and a numeric keypad. It does not have a touchscreen display.

Troubleshooting

Panel display remains blank after power on

Measure the 24 V DC supply voltage at the panel power connector. Check for correct polarity. Inspect the supply cable for damage.

Ensure the power supply is within the 24 V DC specification and correctly wired. If voltage is 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.

No communication with the PLC after project download

Verify the MPI or PROFIBUS DP address configured in the HMI project matches the physical network address of the PLC. Check bus cable connections and termination resistors at both ends of the network.

Correct any address mismatches in the WinCC flexible project and re-download. Replace damaged cables or connectors. Ensure proper bus termination is applied at both ends of the MPI or PROFIBUS segment.

Project download fails or transfer cannot be initiated

Confirm the panel is set to transfer mode by navigating to the panel's system menu. Check the PC adapter or communication cable connection between the engineering PC and the panel.

Place the panel in transfer mode via the system menu. Use a known-good PC adapter cable and verify the correct COM port and transfer settings in WinCC flexible. Ensure the project firmware version matches the panel firmware.

Function keys do not respond to presses

Check if the panel is in the correct operating mode and not locked. Inspect the membrane keypad surface for physical damage or contamination around the key areas.

Clean the keypad surface with a dry cloth. If keys remain unresponsive, the membrane keypad assembly may be worn or damaged and requires replacement. Contact a qualified repair service for keypad replacement.

Alarm messages are not displayed on the panel

Verify that the alarm tags in the WinCC flexible project are correctly mapped to the corresponding PLC addresses. Check that the PLC is setting the alarm bits as expected during testing.

Review the alarm configuration in WinCC flexible and confirm the PLC address assignments are correct. Re-download the project after corrections. Test alarm triggering by manually setting the relevant PLC bits during commissioning.

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