Siemens 6AV6355-1AA47-7HC4 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7HC4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7HC4 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens AG. It is a compact, key-operated operator panel designed for machine-level human-machine interface applications, providing operators with a straightforward interface for monitoring and controlling automated processes. This unit is part of the SIMATIC HMI Basic Panels generation, offering reliable performance in industrial environments.

The OP 77A features a monochrome LCD display with a resolution suited for text and simple graphic visualization, along with a membrane keypad for operator input. It supports the MPI and PROFIBUS DP communication interfaces, enabling direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and offers onboard memory for storing project data, recipes, and alarm logs. The unit operates on a 24 V DC supply and is rated to IP65 on the front face, providing protection against dust and water ingress in panel-mounted installations.

The OP 77A is widely used in machine building, manufacturing automation, and process control applications where a cost-effective, robust operator interface is required. It is particularly suited for controlling conveyor systems, packaging machinery, and general-purpose industrial machines. Its compact form factor and panel-mount design make it appropriate for integration into control cabinets and machine front panels across a broad range of industries.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Input Voltage	24 V DC
Voltage Tolerance	19.2 V DC to 28.8 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 2005 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 HMI panel 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 HMI project configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect communication cables for damage or loose connectors. Check bus termination and cable shielding. Restart the HMI panel and PLC if the connection is not restored automatically.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel successfully.
Verify the PC-to-panel connection (MPI or serial cable). Ensure the correct WinCC flexible version is used and the project is compiled without errors before transfer.
Event ID: 40000: System memory low. Available memory on the panel is insufficient to load or run the current project.
Reduce the project size by removing unused screens, tags, or alarm entries. Ensure no unnecessary data logs or recipe records are stored on the device.
Event ID: 50000: Internal device error. A hardware or firmware fault has been detected within the panel.
Perform a factory reset of the panel. If the error persists after reset and re-download of the project, the unit may require repair or replacement.
Event ID: 70000: Configuration error detected. The loaded project contains settings incompatible with the current 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.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A panel?

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

What software is required to configure the 6AV6355-1AA47-7HC4?

The panel is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are compiled on a PC and transferred to the panel via MPI cable or PROFIBUS connection.

What is the supply voltage for this operator panel?

The OP 77A operates on a 24 V DC supply voltage, with an acceptable input range of 19.2 V DC to 28.8 V DC.

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

The front face of the OP 77A is rated to IP65, providing protection against dust ingress and low-pressure water jets, making it suitable for panel-mounted installations in industrial environments.

Can the OP 77A display graphics and images?

The OP 77A supports basic graphic elements and bitmap images on its monochrome LCD display, but it is primarily designed for text-based process visualization and simple status displays rather than complex graphical HMI applications.

Troubleshooting

Display remains blank after power is applied

Check the 24 V DC supply voltage at the panel power connector using a multimeter. Verify the voltage is within the 19.2 V DC to 28.8 V DC range. Inspect the connector for correct polarity.

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

HMI panel shows communication error and cannot connect to PLC

Verify the MPI or PROFIBUS DP cable is securely connected at both the panel and PLC ends. Check that bus termination resistors are correctly installed at both ends of the bus segment. Confirm the PLC address in the HMI project matches the actual PLC configuration.

Replace or reseat communication cables. Correct address settings in the WinCC flexible project and re-download. Ensure only the correct nodes have bus termination enabled.

Project download from PC to panel fails or times out

Check the PC-to-panel communication cable (MPI adapter or PC adapter USB). Verify the correct COM port or USB interface is selected in WinCC flexible transfer settings. Confirm the panel is in transfer mode.

Place the panel in transfer mode manually via the Start Center menu. Use a known-good MPI or PC adapter cable. Reinstall the WinCC flexible communication driver on the PC if the issue persists.

Operator keypad buttons are unresponsive or intermittently responsive

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

Clean the keypad surface with a dry cloth. If specific keys are physically damaged or the membrane is torn, the keypad membrane assembly requires replacement. If all keys are unresponsive, the main board may need inspection or replacement.

Panel repeatedly restarts or enters bootloader mode unexpectedly

Check the supply voltage for instability or voltage drops under load. Inspect the project for memory overflows or configuration errors that may cause a runtime crash. Verify the firmware version is compatible with the loaded project.

Stabilize the 24 V DC power supply. Perform a factory reset and re-download a freshly compiled project. Update the panel firmware if a version mismatch is identified between the firmware and the WinCC flexible project target.

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