Siemens 6AV6355-1AA47-7CB0 OP 77B

€ 1.141,69

SKU: 6AV6355-1AA47-7CB0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CB0 is an OP 77B operator panel belonging to the SIMATIC HMI Basic Panels series. This unit provides a compact, keypad-based human-machine interface designed for straightforward machine-level operation and monitoring tasks. It is part of Siemens' established line of operator panels intended for integration into standard industrial control cabinets and machinery.

The OP 77B features a monochrome STN LCD display with a resolution of 160 x 64 pixels and a backlit screen for visibility in varying ambient conditions. It supports MPI and PROFIBUS DP communication interfaces, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs. Configuration is performed using WinCC flexible software, and the panel includes function keys for direct operator input without requiring a touchscreen. The unit operates on a 24 V DC supply and is rated IP65 on the front panel for protection against dust and water ingress.

The OP 77B is commonly deployed in manufacturing, packaging, and process automation environments where a cost-effective, robust operator interface is required at the machine level. Its keypad-driven design makes it suitable for applications where touchscreen operation is impractical due to gloves, vibration, or harsh environmental conditions. Industries such as automotive assembly, food and beverage processing, and general machine building regularly utilize this panel for local operator control and status display.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 64 pixels
Display Size	4 inch
Input Voltage	24 V DC
Communication Interface	MPI, PROFIBUS DP
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)
Configuration Software	WinCC flexible
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Mounting	Panel mounting
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Connection to the PLC could not be established or was interrupted during operation.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify PLC address settings match the HMI project configuration.
Event ID: 10001: Communication timeout between the HMI panel and the configured PLC controller.
Check network cabling and bus termination. Confirm the PLC is in RUN mode and that the configured station address is correct.
Event ID: 20000: Project download failed or no valid project is loaded on the device.
Re-download the WinCC flexible project to the panel via MPI or PROFIBUS. Ensure the project is compiled without errors before transfer.
Event ID: 40000: Internal device error or system fault detected during panel startup.
Perform a factory reset of the panel. If the fault persists, the internal hardware may require inspection or replacement.
Event ID: 50000: Configuration error detected; the loaded project is incompatible with the panel firmware version.
Update the panel firmware to match the WinCC flexible project version, or recompile and re-download the project using the correct panel type.
Event ID: 60000: Backlight failure or display illumination fault detected.
If the display content is visible but unlit, the backlight unit has failed. The panel will require repair or replacement of the backlight component.
Event ID: 70000: Power supply undervoltage detected; supply voltage has dropped below the minimum operating threshold.
Measure the 24 V DC supply at the panel connector. Ensure the power supply unit is rated adequately and check for voltage drops in the wiring.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B (6AV6355-1AA47-7CB0)?

The OP 77B is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with certain third-party controllers supported by WinCC flexible drivers.

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

The OP 77B is configured using Siemens WinCC flexible software. Projects are compiled in WinCC flexible and downloaded to the panel via MPI or PROFIBUS DP connection.

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

The front panel of the OP 77B is rated IP65, providing protection against dust ingress and low-pressure water jets. The rear of the unit is rated IP20.

Does the OP 77B support touchscreen input?

No, the OP 77B is a keypad-based operator panel and does not feature a touchscreen. Operator input is performed via the integrated function and system keys.

What is the operating supply voltage for the OP 77B?

The OP 77B operates on a 24 V DC supply voltage. Ensure the power source is within the specified tolerance range to avoid undervoltage faults.

Troubleshooting

Display remains blank after power on

Check that 24 V DC is present at the power supply connector. Verify the power supply polarity is correct and measure voltage at the panel terminals.

If voltage is correct and the display remains blank, the internal power supply or backlight may have failed. Inspect internal fuses if accessible, and consider panel repair or replacement.

Panel fails to communicate with the PLC

Verify MPI or PROFIBUS DP cable connections at both the panel and PLC ends. Check that bus termination resistors are correctly placed at both ends of the network segment.

Correct any wiring faults, ensure the station addresses configured in the WinCC flexible project match the physical PLC settings, and confirm the PLC is in RUN mode.

Project download to the panel fails or times out

Confirm the communication cable between the programming PC and the panel is functioning. Check that the correct COM port or USB-to-MPI adapter is selected in WinCC flexible transfer settings.

Retry the transfer after restarting the panel in transfer mode. Ensure the WinCC flexible project is compiled without errors and that the panel firmware version is compatible with the project.

Operator keys are unresponsive or register incorrect inputs

Inspect the keypad membrane for physical damage, contamination, or deformation. Test individual keys in the panel's diagnostic or startup menu if available.

Clean the keypad surface and surrounding area. If keys remain unresponsive, the keypad membrane assembly may require replacement by a qualified repair technician.

Panel repeatedly restarts or enters a boot loop

Check the 24 V DC supply for voltage fluctuations or instability under load. Review the loaded project for configuration errors that may cause a runtime crash on startup.

Stabilize the power supply and ensure adequate current capacity. Re-download a verified WinCC flexible project. If the issue persists, perform a factory reset or send the unit for hardware inspection.

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