Siemens 6AV6355-1AA47-7CE2 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7CE2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CE2 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-operated interface for process visualization and control, and is part of Siemens' SIMATIC HMI product line. It is intended for use with Siemens SIMATIC S7 and other compatible controllers via standard communication interfaces.

The OP 77A features a monochrome LCD display with a resolution suitable for text and simple graphic visualization, along with a membrane keypad for operator input. It supports MPI and PROFIBUS DP communication protocols, enabling direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and supports alarm management, recipe handling, and trend display functions. It operates on a 24 V DC supply and is built to withstand typical industrial environmental conditions.

The OP 77A is commonly deployed in machine-level control panels across manufacturing, process automation, and packaging industries. Its compact form factor and keypad-based operation make it well suited for applications where a small footprint and robust input method are preferred over touchscreen interfaces. It is frequently used in machinery where operators need to monitor process values, acknowledge alarms, and adjust setpoints directly at the machine.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 inches
Display Colors	Monochrome (STN)
Input 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 Rating (Front)	IP65
Mounting	Panel mounting
Configuration Software	WinCC flexible
Series	SIMATIC HMI OP 77A
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC. The connection to the controller has been interrupted or cannot be established.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the HMI project configuration. Restart both the panel and the PLC if necessary.
Event ID: 10001: No connection to the PLC. The HMI panel cannot reach the configured controller on the network.
Verify the communication cable is properly connected and undamaged. Confirm the PLC is powered and running. Check that the station address and baud rate in the HMI project match the PLC settings.
Event ID: 20000: Tag read error. The HMI panel was unable to read a configured tag from the PLC.
Verify the tag address in the WinCC flexible project matches the actual data block or memory area in the PLC program. Check that the PLC program is running and the relevant data areas are accessible.
Event ID: 20001: Tag write error. The HMI panel was unable to write a value to a configured tag in the PLC.
Check that the target memory area in the PLC is not write-protected. Verify the tag address configuration in WinCC flexible. Ensure the PLC is in RUN mode and accepting write requests.
Event ID: 40000: Project download error. A fault occurred during transfer of the HMI project from the engineering PC to the panel.
Check the transfer cable connection between the PC and the panel. Ensure the panel is in transfer mode. Verify that the WinCC flexible project is compatible with the firmware version on the panel.
Event ID: 50000: System memory low. The panel's available memory for runtime operation is insufficient.
Reduce the number of active alarms, recipes, or trend data stored on the device. Optimize the project in WinCC flexible to reduce memory usage and re-download the project.
Event ID: 60000: Firmware version mismatch. The firmware on the panel is not compatible with the downloaded project.
Update the panel firmware to the version required by the WinCC flexible project, or re-engineer the project targeting the firmware version currently installed on the panel.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7CE2)?

The OP 77A is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It can also communicate with S7-1200 and certain third-party controllers depending on the protocol configuration.

What software is used to configure and program the OP 77A?

The OP 77A is configured using Siemens WinCC flexible software. The project is then transferred to the panel via a PC adapter cable or PROFIBUS connection.

What is the supply voltage for the 6AV6355-1AA47-7CE2?

The panel operates on a 24 V DC supply voltage, which is standard 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 control cabinet cutout, making it suitable for environments with dust and water spray.

Can the OP 77A be used as a replacement for older SIMATIC OP panels?

Yes, the OP 77A is designed as a successor to earlier SIMATIC operator panels such as the OP 7 and OP 17, and can often be used as a direct replacement with appropriate project adaptation in WinCC flexible.

Troubleshooting

Display remains blank after power is applied

Check the 24 V DC supply voltage at the panel's power connector using a multimeter. Verify that the supply is within the specified range and that the connector is properly seated.

Ensure the 24 V DC supply is stable and correctly wired. 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 or replacement.

HMI panel shows 'No connection to PLC' message at runtime

Verify the MPI or PROFIBUS DP cable is connected to both the panel and the PLC. Check the bus termination at both ends of the cable. Confirm the PLC station address matches the address configured in the WinCC flexible project.

Replace or reseat the communication cable. Correct any address mismatches in the project and re-download. Ensure bus terminators are installed only at the physical ends of the network segment.

Project transfer from PC to panel fails or times out

Check that the panel is set to transfer mode (accessible via the panel's start center or loader menu). Verify the PC adapter cable is functioning and the correct COM port or USB adapter is selected in WinCC flexible transfer settings.

Restart the panel in transfer mode and retry the download. Try a different PC adapter cable if available. Ensure the WinCC flexible project version is compatible with the panel firmware version.

Operator keys are unresponsive or intermittently fail

Inspect the membrane keypad for physical damage, contamination, or wear. Check whether the issue is limited to specific keys or affects all keys, which helps distinguish between a localized keypad fault and a controller board issue.

Clean the keypad surface with a dry cloth. If specific keys have failed due to wear, the membrane keypad assembly may need to be replaced. If all keys are unresponsive, inspect the internal ribbon cable connection between the keypad and the main board.

Alarm messages are not displayed or acknowledged correctly

Check the alarm configuration in the WinCC flexible project to ensure alarm tags are correctly mapped to PLC addresses. Verify that the PLC program is setting and resetting the alarm bits as expected.

Correct any tag address mismatches in the alarm configuration and re-download the project. If alarms cannot be acknowledged, check that the acknowledgment bit address in the PLC program matches the configuration in WinCC flexible.

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