Siemens 6AV6355-1AA47-7BB2 OP 77B

€ 1.995,00

SKU: 6AV6355-1AA47-7BB2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7BB2 is an operator panel belonging to the OP 77B series, part of the SIMATIC HMI product line from Siemens. This compact panel operator unit is designed for machine-level human-machine interface applications, providing a straightforward interface for process monitoring and control. It is a key component in Siemens' range of basic HMI devices, offering reliable operator interaction in industrial environments.

The OP 77B features a monochrome STN LCD display and a membrane keypad for operator input, eliminating the need for a touchscreen while maintaining robust usability. It supports MPI and PROFIBUS DP communication interfaces, enabling direct integration with Siemens SIMATIC S7 PLCs. The unit operates on a 24 V DC supply and is configured using Siemens WinCC flexible software, supporting tag-based data exchange, alarm management, and recipe handling within its onboard memory capacity.

The OP 77B is widely deployed in manufacturing, packaging, and process automation environments where a cost-effective, durable HMI solution is required at the machine level. Its compact form factor and keypad-based operation make it suitable for panel mounting in control cabinets where space is limited and touchscreen operation is not required. Industries such as food and beverage, automotive assembly, and general machine building commonly use this device for local operator control and status monitoring.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
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
IP Rating (Rear)	IP20
Mounting	Panel mounting
Configuration Software	WinCC flexible 2008
Series	SIMATIC HMI OP 77B
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 configured controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the HMI project configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during runtime operation.
Inspect the communication cable for damage or loose connectors. Check the network topology and bus termination. Restart the HMI panel and verify PLC status.
Event ID: 20000: Configuration error detected. The project loaded on the device is incompatible or corrupt.
Re-transfer the project from WinCC flexible to the panel. Ensure the correct device type is selected in the project settings before compilation and download.
Event ID: 40000: System memory low. The available runtime memory on the device is insufficient for the current project.
Reduce the number of active alarms, screens, or recipe entries in the project. Optimize the project in WinCC flexible and re-download to the device.
Event ID: 50000: Internal device error or firmware fault detected during startup or operation.
Perform a factory reset of the panel via the loader menu. If the fault persists, update the device firmware using ProSave and re-download the project.
Event ID: 60000: Tag update error. One or more configured tags cannot be read from or written to the PLC.
Verify that the PLC data blocks and addresses referenced in the HMI project exist and are accessible. Check for address mismatches between the project and the PLC program.
Event ID: 70000: Alarm buffer overflow. The number of pending alarms has exceeded the buffer capacity of the device.
Acknowledge and clear existing alarms on the panel. Review the alarm configuration in WinCC flexible to reduce unnecessary alarm triggers or increase acknowledgement frequency.

Frequently Asked Questions

Which communication interfaces does the OP 77B support?

The OP 77B supports MPI and PROFIBUS DP interfaces, allowing direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs without additional communication modules.

What software is used to configure the Siemens 6AV6355-1AA47-7BB2?

The panel is configured using Siemens WinCC flexible 2008. Projects are transferred to the device via an MPI or PROFIBUS DP connection, or using a USB-to-MPI adapter.

What is the supply voltage for this operator panel?

The OP 77B operates on a 24 V DC supply voltage, which is standard for SIMATIC HMI devices and compatible with typical industrial control cabinet power supplies.

Does the OP 77B support touchscreen input?

No, the OP 77B uses a membrane keypad for operator input and does not feature a touchscreen. Navigation and data entry are performed using the function and system keys on the keypad.

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

The front panel of the OP 77B carries an IP65 protection rating, making it resistant to dust ingress and low-pressure water jets, suitable for typical industrial panel mounting environments.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the power connector on the rear of the panel. Check for correct polarity and verify the supply is within the specified voltage range.

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 or replacement.

Panel fails to communicate with the S7 PLC

Check the MPI or PROFIBUS DP cable connections at both the panel and PLC ends. Verify bus termination is correctly applied at both ends of the network segment. Confirm the station address and baud rate in the HMI project match the PLC configuration.

Replace or reseat the communication cable. Correct address and baud rate settings in WinCC flexible and re-download the project. Ensure only one active bus termination exists at each end of the segment.

Project transfer from WinCC flexible fails

Verify the communication interface selected in WinCC flexible matches the physical connection being used. Check that the correct device type and firmware version are selected in the project.

Use ProSave to check and update the panel firmware if necessary. Ensure the MPI adapter or PROFIBUS cable is correctly installed and recognized by the PC. Retry the transfer with the panel in transfer mode, accessible via the loader menu on startup.

Operator keys are unresponsive or register incorrect inputs

Inspect the membrane keypad for physical damage, contamination, or deformation. Test each key systematically using the panel's built-in key test function available in the service menu.

Clean the keypad surface with a dry cloth. If individual keys are found to be faulty in the key test, the membrane keypad assembly requires replacement. Contact a qualified repair service for keypad replacement.

Alarms are not displayed or acknowledged correctly

Check the alarm configuration in the WinCC flexible project, including trigger tags, alarm classes, and acknowledgement settings. Verify that the PLC tags linked to alarm triggers are updating correctly.

Correct any misconfigured alarm tags or acknowledgement groups in the project and re-download. Ensure the PLC program is writing the correct values to the alarm trigger bits and that communication between the panel and PLC is stable.

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