Siemens 6AV6355-1AA47-7HC5 OP 77B

€ 3.495,00

SKU: 6AV6355-1AA47-7HC5 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7HC5 is an operator panel belonging to the OP 77B series within the Siemens SIMATIC HMI product family. It is a compact, key-operated operator panel designed for machine-level human-machine interface applications, providing operators with a straightforward means of monitoring and controlling industrial processes. This unit is part of the broader SIMATIC HMI Basic Panels generation and is manufactured by Siemens AG.

The OP 77B features a monochrome STN LCD display and a membrane keypad with function keys, system keys, and numeric entry keys for operator input without touchscreen dependency. It supports MPI and PROFIBUS DP communication interfaces, enabling direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. Configuration is performed using Siemens WinCC flexible software, and the panel includes internal flash memory for project storage. The unit operates on a 24 V DC supply and is rated to IP65 on the front face for protection against dust and water ingress.

The OP 77B is widely deployed in machine building, packaging machinery, conveyor systems, and general factory automation where a robust, cost-effective operator interface is required without the complexity of a full graphical touchscreen panel. Its compatibility with the SIMATIC S7 PLC range and support for PROFIBUS DP makes it suitable for integration into existing Siemens automation architectures. The panel's compact form factor and panel-mount design allow installation in control cabinet doors and machine enclosures with limited space.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
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
Configuration Software	WinCC flexible 2008 or higher
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Certifications	CE, UL, cULus

Common Error Codes and System Events

Event ID: 10000: Communication error between the OP 77B and the connected PLC. The panel cannot establish or maintain a connection to the controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the panel configuration in WinCC flexible. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect physical cabling for damage or loose connectors. Check bus termination and cable shielding. Restart the panel and PLC if the connection does not recover automatically.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel successfully.
Verify the PC-to-panel communication cable is correctly connected. Check that the WinCC flexible project is compiled without errors before transfer. Ensure the panel is in transfer mode.
Event ID: 40000: System memory low. The panel's available memory for runtime operation is insufficient.
Reduce the size of the WinCC flexible project by removing unused tags, screens, or alarm entries. Recompile and re-download the project to the panel.
Event ID: 50000: Internal device error detected during panel self-test or runtime operation.
Perform a panel restart. If the error persists, perform a factory reset via the panel's loader menu. If the fault remains after reset, the panel may require hardware repair or replacement.
Event ID: 60000: Configuration error. The loaded project is incompatible with the panel firmware version.
Update the panel firmware to the version required by the WinCC flexible project, or recompile the project targeting the installed firmware version and re-download.
Event ID: 70000: Alarm buffer overflow. The number of pending alarms has exceeded the panel's alarm buffer capacity.
Acknowledge and clear existing alarms on the panel. Review the alarm configuration in WinCC flexible to reduce unnecessary alarm triggers or increase acknowledgement frequency in the application.

Frequently Asked Questions

Which PLCs are compatible with the Siemens OP 77B (6AV6355-1AA47-7HC5)?

The OP 77B 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 the PPI protocol depending on configuration.

What software is required to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are compiled in WinCC flexible and downloaded to the panel via an MPI or PROFIBUS DP connection or a PC adapter cable.

What is the supply voltage for the 6AV6355-1AA47-7HC5?

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

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

The front face of the OP 77B is rated to IP65, providing protection against dust ingress and low-pressure water jets, making it suitable for installation in industrial cabinet doors.

Does the OP 77B support touchscreen input?

No, the OP 77B does not have a touchscreen. Operator input is performed exclusively via the integrated membrane keypad, which includes function keys, system keys, and a numeric keypad.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Check that the supply voltage is within the specified range and that polarity is correct.

Correct any wiring errors or supply voltage issues. If the supply is confirmed correct and the display remains blank, the internal power supply or display backlight may have failed and the unit should be sent for repair.

Panel cannot communicate with the PLC

Verify the MPI or PROFIBUS DP address configured in the WinCC flexible project matches the address set on the panel and the PLC. Check physical cable connections, bus termination, and cable shielding continuity.

Correct address mismatches in the WinCC flexible project or panel loader settings. Replace damaged cables and ensure proper bus termination resistors are fitted at both ends of the network segment.

Project download fails or transfer does not complete

Confirm the panel is set to transfer mode via the loader menu. Check the PC adapter cable connection and that the correct COM port or USB adapter is selected in WinCC flexible transfer settings.

Set the panel to transfer mode, select the correct interface in WinCC flexible, and retry the download. If using a USB-to-MPI adapter, ensure the correct driver is installed on the PC.

Function keys do not respond to presses

Check whether the issue affects all keys or specific keys. Inspect the membrane keypad surface for physical damage, contamination, or deformation that may prevent key actuation.

Clean the keypad surface with a dry cloth. If specific keys are permanently unresponsive, the membrane keypad assembly may need replacement. Verify in the WinCC flexible project that the keys are correctly assigned to functions.

Panel repeatedly restarts or enters an error loop on startup

Attempt to access the loader menu during startup by pressing the appropriate key combination. Check whether the installed project is compatible with the panel firmware version.

Perform a factory reset from the loader menu to clear the installed project. Re-download a correctly compiled and compatible WinCC flexible project. Update panel firmware if a version mismatch is identified.

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