Siemens 6AV6355-1AA47-7BD7 OP 77B

€ 1.995,00

SKU: 6AV6355-1AA47-7BD7 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7BD7 is an operator panel belonging to the OP 77B series within the Siemens SIMATIC HMI product family. This compact panel operator unit is designed for machine-level human-machine interface applications, providing a text-based display and membrane keypad for process monitoring and control. It is part of the SIMATIC HMI Basic Panels generation and is manufactured by Siemens AG as a robust front-panel-mount device.

The OP 77B features a 4-line STN LCD text display capable of showing alphanumeric characters, function keys, and system messages. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration with Siemens S7-200, S7-300, and S7-400 PLCs without an additional communication module. The unit is configured using Siemens WinCC flexible software and supports recipe management, alarm logging, and trend display functions within its onboard memory.

The OP 77B is widely deployed in manufacturing, packaging, and process automation environments where a cost-effective, compact operator interface is required at the machine level. Its panel-mount IP65-rated front face makes it suitable for installation in control cabinet doors exposed to dust and water spray. Industries such as food and beverage, automotive assembly, and general machinery manufacturing commonly use this panel for local operator interaction with S7-series PLCs.

Technical Specifications

Display Type	STN LCD, monochrome
Display Lines	4 lines of text
Characters per Line	20 characters
Keypad	Membrane keypad with function keys
Input Voltage	24 V DC
Power Consumption	Max. 6 W
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

Common Error Codes & System Events

Event ID: 10000: Configuration error: no valid project loaded on the device.
Download a valid WinCC flexible project to the OP 77B using the configuration PC and verify project compatibility with the firmware version.
Event ID: 20000: Communication error: connection to the PLC cannot be established.
Check MPI or PROFIBUS DP cable connections, verify the PLC address settings match the project configuration, and confirm the PLC is powered and in RUN mode.
Event ID: 40000: Tag read error: a process tag cannot be read from the PLC.
Verify the tag address in the WinCC flexible project matches the actual PLC data block or memory address. Check PLC program for correct data availability.
Event ID: 50000: Tag write error: a value cannot be written to the PLC tag.
Check write permissions for the tag in the WinCC flexible project. Verify the PLC is not in a protected or read-only state and that the address is correct.
Event ID: 70000: System memory low: available memory on the HMI device is insufficient.
Reduce the number of active alarms, recipes, or data logs stored on the device. Archive and clear historical data to free memory.
Event ID: 110000: Firmware update error: firmware transfer to the device was interrupted or failed.
Restart the firmware update procedure using ProSave or WinCC flexible. Ensure stable USB or serial connection and sufficient power supply during the update process.
Event ID: 130000: Operating system error: internal system fault detected on the HMI panel.
Perform a device reset by cycling power. If the fault persists, reload the firmware using ProSave and re-download the project configuration.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B 6AV6355-1AA47-7BD7?

The OP 77B is compatible with Siemens 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 depending on configuration.

What software is used to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible 2005 or later versions. Projects are downloaded to the device via a serial or USB-to-serial connection using the ProSave tool or directly from WinCC flexible.

What is the supply voltage for the 6AV6355-1AA47-7BD7?

The device operates on a 24 V DC supply voltage. Ensure the power supply is within the specified tolerance range to avoid device faults.

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 water jets, suitable for installation in control cabinet doors.

Can the OP 77B display graphical content or only text?

The OP 77B is a text-based operator panel and does not support graphical image display. It is limited to alphanumeric characters, symbols, and status indicators on its monochrome LCD.

Troubleshooting

Display remains blank after power is applied

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

Correct any wiring errors or supply voltage issues. If the supply is confirmed good and the display remains blank, the internal power supply or LCD backlight may have failed and the unit requires repair or replacement.

HMI shows 'No connection to PLC' or communication error on startup

Check the MPI or PROFIBUS DP cable for continuity and correct termination resistors at both ends of the bus. Verify the PLC address and baud rate settings in the WinCC flexible project match the physical PLC configuration.

Correct cable wiring, ensure proper bus termination, and align the PLC address and baud rate settings in the project. Re-download the project to the OP 77B if configuration changes are made.

Operator panel does not respond to keypad input

Inspect the membrane keypad for physical damage, contamination, or deformation. Test individual keys by observing on-screen responses or using the panel's built-in key test function if available.

Clean the keypad surface with a dry cloth. If keys are physically damaged or unresponsive after cleaning, the membrane keypad assembly requires replacement.

Project download fails or connection to PC is not established

Verify the serial or USB-to-serial adapter is correctly installed on the PC and the correct COM port is selected in WinCC flexible or ProSave. Check the transfer cable for continuity.

Reinstall the USB-to-serial driver, select the correct COM port, and retry the download. Ensure the OP 77B is set to transfer mode before initiating the download from the PC.

Alarm messages are not displayed or alarms are missing

Check the alarm configuration in the WinCC flexible project to confirm alarm tags are correctly mapped to PLC addresses. Verify the PLC is writing the expected values to the alarm trigger bits.

Correct any tag address mismatches in the alarm configuration and re-download the project. Confirm the PLC program is correctly setting and resetting alarm bits as intended.

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