Siemens 6AV6355-1AA47-7EM1 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7EM1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EM1 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens as part of the SIMATIC HMI Basic Panels product family. This compact operator panel is designed for machine-level human-machine interface applications, providing a straightforward and reliable interface between operators and automated systems. It features a monochrome display and a membrane keypad for operator input, making it suitable for environments where a simple, robust HMI solution is required.

The OP 77A supports communication via PROFIBUS DP and MPI interfaces, enabling integration with SIMATIC S7 PLCs and other compatible controllers. The panel is configured using WinCC flexible software, which allows the creation of screens, alarms, and recipes. It operates on a 24 V DC supply and is designed to meet industrial environmental requirements, including resistance to vibration and electromagnetic interference. The unit is rated to IP65 on the front face, providing protection against dust and water ingress in panel-mounted installations.

The SIMATIC OP 77A is widely used in manufacturing, process automation, and machine building industries where a cost-effective, reliable operator interface is needed. It is particularly suited for controlling and monitoring SIMATIC S7-200, S7-300, and S7-400 PLC systems on production lines, packaging machines, and general industrial machinery. Its compact form factor and panel-mount design make it easy to integrate into existing control cabinet doors and operator stations.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
Power Consumption	Max. 6 W
Communication Interface	PROFIBUS DP, MPI
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)
Configuration Software	WinCC flexible 2005 or higher
Mounting	Panel mounting
Certifications	CE, UL, cULus

Common Error Codes & 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 PROFIBUS/MPI cable connections and termination resistors. Verify the PLC address settings match the HMI project configuration. Restart both the PLC and the HMI panel.
Event ID: 10001: Connection to the PLC was interrupted during runtime operation.
Inspect physical cabling for damage or loose connectors. Check bus termination and ensure no address conflicts exist on the network. Re-establish communication and reload the project if necessary.
Event ID: 20000: Project download error. The project could not be transferred to the HMI panel successfully.
Verify the transfer cable and PC interface settings. Ensure WinCC flexible is configured for the correct HMI type and communication port. Retry the download after restarting the panel in transfer mode.
Event ID: 40000: System memory low. The available memory on the HMI panel is insufficient to run the loaded project.
Reduce the project size by removing unused screens, graphics, or recipes. Ensure no unnecessary background tasks are running. Transfer an optimized project to the panel.
Event ID: 50000: Configuration error detected. The project loaded on the panel is incompatible with the panel firmware version.
Update the panel firmware to the version required by the WinCC flexible project. Alternatively, recompile the project using a compatible version of WinCC flexible and re-download.
Event ID: 60000: Internal device fault. A hardware error has been detected within the HMI panel.
Perform a power cycle of the panel. If the fault persists, back up the project and contact Siemens technical support or arrange for panel repair or replacement.
Event ID: 70000: Tag limit exceeded. The number of configured tags in the project exceeds the maximum supported by this panel variant.
Review the project tag configuration and reduce the number of tags to within the supported limit for the OP 77A. Consolidate tags where possible and re-download the project.

Frequently Asked Questions

What communication interfaces does the OP 77A (6AV6355-1AA47-7EM1) support?

The OP 77A supports PROFIBUS DP and MPI communication interfaces, allowing direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs without additional communication modules.

What software is required to configure the 6AV6355-1AA47-7EM1?

The panel is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are created on a PC and downloaded to the panel via the appropriate transfer cable.

What is the supply voltage for the OP 77A?

The panel operates on a 24 V DC supply voltage, which is standard for SIMATIC HMI panels and compatible with most industrial control cabinet power supplies.

What is the front panel IP protection rating of the 6AV6355-1AA47-7EM1?

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

Is the OP 77A compatible with SIMATIC S7-1200 or S7-1500 PLCs?

The OP 77A is primarily designed for use with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. Compatibility with S7-1200 or S7-1500 is not supported, as those controllers require PROFINET-capable HMI panels.

Troubleshooting

Display remains blank after power on

Check that 24 V DC is present at the power supply terminals of the panel using a multimeter. Inspect the power connector for loose or damaged wiring.

Ensure the power supply is within the specified 24 V DC range and can supply sufficient current. If voltage is correct and the display remains blank, the internal power supply or backlight may be faulty and the unit should be sent for repair.

Panel shows 'No connection to PLC' message during runtime

Verify the PROFIBUS or MPI cable is securely connected at both the panel and PLC ends. Check that bus termination is correctly applied at both ends of the network segment.

Replace or reseat the communication cable. Confirm that the PLC station address in the HMI project matches the actual PLC configuration. Check for address conflicts on the bus and correct as needed.

Project download fails or times out from WinCC flexible

Confirm the panel is in transfer mode (accessible via the Start Center or by holding the appropriate key combination during boot). Verify the PC communication port settings match the transfer cable type being used.

Restart the panel and re-enter transfer mode. Ensure the correct COM port or USB adapter driver is installed on the PC. Retry the download with WinCC flexible set to the matching communication parameters.

Operator keys are unresponsive or register incorrect inputs

Inspect the membrane keypad for physical damage, contamination, or deformation. Check whether the issue is consistent across all keys or limited to specific ones.

Clean the keypad surface with a dry cloth. If specific keys are permanently unresponsive, the membrane keypad assembly may be worn or damaged and should be replaced. For a refurbished unit, verify the keypad connector is properly seated internally.

Panel repeatedly restarts or enters an error loop on startup

Attempt to boot the panel into the Start Center by holding the appropriate key during power-on. Check whether the loaded project is compatible with the installed firmware version.

Update the panel firmware to the version required by the project, or reload a compatible project. If the panel cannot be accessed via the Start Center, a factory reset or firmware recovery procedure may be required using the Siemens ProSave tool.

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