Siemens 6AV6355-1AA47-7CE1 OP 77A

€ 2.495,00

SKU: 6AV6355-1AA47-7CE1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CE1 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. It is a compact, key-operated operator panel designed for machine-level human-machine interface applications, providing a straightforward interface for process monitoring and control. This unit is part of the SIMATIC HMI Basic Panels generation, intended for use with Siemens SIMATIC S7 PLCs and compatible controllers.

The OP 77A features a monochrome LCD display with a resolution of 128 x 64 pixels and a backlit screen for clear readability in various lighting conditions. 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 a defined number of tags, alarm messages, and recipe management functions. The housing is rated IP65 on the front face, providing protection against dust and water jets in industrial environments.

The OP 77A is widely used in manufacturing, packaging, and process automation applications where a compact, cost-effective operator interface is required at the machine level. Its robust construction and compatibility with the SIMATIC S7-200, S7-300, and S7-400 controller families make it suitable for retrofitting existing installations as well as new machine builds. Industries such as food and beverage, automotive supply, and general machinery manufacturing commonly deploy this panel for local operator control and status display.

Technical Specifications

Display Type	Monochrome LCD with backlight
Display Resolution	128 x 64 pixels
Number of Keys	10 function keys + navigation keys
Input/Operating Voltage	24 V DC
Power Consumption	Approx. 3.5 W
Communication Interface	MPI / PROFIBUS DP
IP Protection Rating (Front)	IP65
IP Protection 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
Configuration Software	WinCC flexible 2005 or higher

Common Error Codes and System Events

Event ID: 1000: Configuration error: The project loaded on the panel is incompatible or corrupt.
Re-transfer the project using WinCC flexible. Verify the project version matches the panel firmware version.
Event ID: 10000: Communication error: No connection to the configured PLC controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify PLC address settings match the panel configuration.
Event ID: 10001: Communication timeout: The PLC did not respond within the expected time window.
Check network cable integrity and bus termination. Verify PLC is in RUN mode and the configured station address is correct.
Event ID: 20000: Tag read error: A configured tag could not be read from the PLC.
Verify the tag address exists in the PLC program and the data type matches the HMI configuration. Check PLC program is running.
Event ID: 40000: System memory low: Available memory on the panel is insufficient for the current project.
Reduce the number of configured tags, alarms, or recipe entries in the project. Re-transfer the optimized project to the panel.
Event ID: 50000: Firmware error: Panel firmware version is incompatible with the transferred project.
Update the panel firmware using ProSave tool to a version compatible with the WinCC flexible project version used.
Event ID: 60000: Backlight failure: The LCD backlight has failed or reached end of service life.
Replace the panel or arrange for backlight replacement. Check the 24 V DC supply voltage is within specification.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A panel?

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 a dedicated PPI connection depending on configuration.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or later versions. Projects are transferred to the panel via the MPI interface or using a PC adapter cable.

What is the supply voltage for the 6AV6355-1AA47-7CE1?

The panel requires a 24 V DC supply voltage. Ensure the power supply is within the specified tolerance range to avoid operational faults.

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 water jets. The rear of the panel is rated IP20.

Can the OP 77A display graphics or only text?

The OP 77A supports basic bitmap graphics and text display on its 128 x 64 pixel monochrome LCD. Complex graphical objects are limited compared to touch-based HMI panels.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the panel power connector. Check that the voltage is within the specified tolerance. Inspect the backlight by observing the screen at an angle in a dark environment to determine if the LCD is active but the backlight has failed.

Restore the 24 V DC supply to within specification. If the backlight has failed, the panel unit requires replacement or professional backlight servicing. Check and replace any blown fuses in the power supply circuit.

No communication with PLC after project transfer

Verify the MPI or PROFIBUS DP address configured in the WinCC flexible project matches the address set on the panel and the PLC. Check cable connections and bus termination at both ends of the network segment.

Correct the station address settings in the WinCC flexible project and re-transfer. Ensure bus termination resistors are enabled only at the physical ends of the MPI or PROFIBUS segment. Replace the communication cable if continuity testing reveals a fault.

Panel repeatedly displays 'Establishing connection' message

The panel is unable to establish communication with the configured PLC. This may be caused by incorrect baud rate settings, wrong PLC address, or a faulty cable. Check that the PLC is powered and in RUN or STOP mode.

Verify the baud rate and station address in both the panel configuration and the PLC hardware configuration. Replace the MPI or PROFIBUS cable. Confirm the PLC CPU is operational and the network is correctly terminated.

Project transfer from PC to panel fails

Check the PC adapter cable connection between the PC and the panel MPI port. Verify the correct COM port and transfer speed are selected in WinCC flexible or ProSave. Ensure no other application is using the COM port.

Use a known-good Siemens PC adapter (USB or RS-232 type). Set the transfer baud rate to a lower value such as 19.2 kbps if higher speeds fail. Restart both the PC and the panel before retrying the transfer.

Alarm messages are not displayed on the panel

Check that the alarm tags are correctly configured in WinCC flexible and that the corresponding PLC bit addresses are correct. Verify the PLC program is writing to the expected alarm bit addresses.

Review the alarm configuration in WinCC flexible and cross-reference with the PLC program. Correct any mismatched addresses and re-transfer the project. Ensure the PLC program logic is activating the alarm bits as expected during fault conditions.

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