Siemens 6AV6355-1AA47-7DL3 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7DL3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7DL3 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens as part of its SIMATIC HMI product line. This compact panel operator unit is designed for machine-level human-machine interface applications, providing a straightforward interface for process visualization and operator control. It is a key component in Siemens' portfolio of basic HMI devices intended for integration into control cabinets and machine panels.

The OP 77A features a monochrome STN LCD display with a resolution of 160 x 80 pixels, offering clear text and simple graphic display capabilities. It is equipped with a membrane keypad for operator input, including function keys and system keys for navigation and control. The unit supports MPI and PROFIBUS DP communication interfaces for direct connection to Siemens SIMATIC S7 PLCs, and it operates on a 24 V DC supply voltage. Configuration is performed using Siemens WinCC flexible software, enabling straightforward project engineering.

The OP 77A is widely used in manufacturing, machine building, and process automation environments where a cost-effective, reliable operator interface is required at the machine level. It is particularly suited for applications in packaging machinery, conveyor systems, and general-purpose industrial machinery where basic process monitoring and operator input are needed. Its compact form factor and robust membrane keypad make it appropriate for installation in space-constrained control panels subject to industrial environments.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
Voltage Tolerance	19.2 V DC to 28.8 V DC
Communication Interface	MPI, PROFIBUS DP
Configuration Software	WinCC flexible 2005 or higher
Input Type	Membrane keypad
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
Certifications	CE, UL, cULus
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Communication error between the OP 77A 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 settings match the project configuration. Ensure the PLC is 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 panel and PLC if the connection is not re-established automatically.
Event ID: 20000: Project download error. Transfer of the configuration project to the panel failed.
Verify the transfer cable connection and PC interface settings. Ensure WinCC flexible is configured with the correct transfer parameters and that the panel is in transfer mode.
Event ID: 40000: Internal device error detected during self-test or operation.
Perform a panel restart. If the error persists, perform a factory reset and re-download the project. Contact Siemens technical support if the fault recurs.
Event ID: 50000: Configuration or project error. The loaded project contains settings incompatible with the device type or firmware version.
Check the WinCC flexible project for correct device type selection. Update the panel firmware if necessary and re-download the project.
Event ID: 70000: Firmware update error. The firmware update process was interrupted or failed.
Repeat the firmware update procedure using the correct firmware file for the OP 77A. Ensure stable power supply during the update process.
Event ID: 30000: Tag or variable access error. A configured tag cannot be read from or written to the PLC.
Verify the PLC data block and variable addresses in the WinCC flexible project. Ensure the PLC program contains the referenced data areas and that the PLC is in RUN mode.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

The OP 77A is designed for use 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 PPI protocol.

What software is required to configure the 6AV6355-1AA47-7DL3?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later version. The project is transferred to the panel via a PC adapter cable connected to the MPI interface.

What is the supply voltage for this operator panel?

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

What is the IP protection rating of the OP 77A?

The front face of the OP 77A is rated IP65, providing protection against dust and water jets. The rear of the unit is rated IP20.

Can the OP 77A display graphics and images?

The OP 77A supports basic graphics display on its monochrome STN LCD. It can display simple bitmaps and line graphics, but is primarily suited for text-based process visualization rather than complex graphical interfaces.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the power connector using a multimeter. Verify the voltage is within the 19.2 V to 28.8 V range. Inspect the power cable and connector for damage.

Restore the correct supply voltage if out of range. Replace damaged power cables or connectors. If voltage is correct and display remains blank, the internal power supply or display unit may be faulty and require repair or replacement.

Panel shows 'No connection to PLC' or communication error on screen

Inspect the MPI or PROFIBUS DP cable for physical damage, loose connectors, or incorrect termination. Verify the bus address configured in the project matches the panel and PLC settings.

Replace or reseat the communication cable. Correct bus termination by ensuring terminating resistors are active only at the two physical ends of the bus. Adjust the PLC or panel address in the project configuration if there is a mismatch.

Project transfer from PC to panel fails

Confirm the panel is set to transfer mode by navigating to the transfer settings in the panel's start center. Check the PC adapter cable connection and verify the correct COM port and transfer speed are selected in WinCC flexible.

Set the panel to transfer mode, select the correct interface settings in WinCC flexible, and retry the transfer. Replace the PC adapter cable if communication cannot be established.

Function keys do not respond or produce incorrect actions

Check the project configuration in WinCC flexible to verify that function key assignments are correctly defined. Test individual keys to determine if the issue is isolated to specific keys or affects all keys.

Correct any incorrect key assignments in the WinCC flexible project and re-download to the panel. If keys are physically unresponsive, the membrane keypad may be worn or damaged and require replacement.

Panel repeatedly restarts or enters an error loop after startup

Attempt to access the panel's start center during boot by pressing the appropriate key combination. Check if the loaded project is compatible with the installed firmware version.

Perform a factory reset via the start center to clear the existing project. Update the firmware to the version compatible with the WinCC flexible project, then re-download the project. If restarts continue, the internal hardware may require service.

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