Siemens 6AV6355-1AA47-7ER1 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7ER1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7ER1 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for human-machine interface applications in industrial automation environments. This compact panel provides a key-operated interface for process visualization and control, and is part of Siemens' established SIMATIC HMI product line. It is intended for use as a front-panel operator interface, communicating directly with SIMATIC PLCs and other compatible controllers.

The OP 77A features a monochrome LCD display with a resolution of 160 x 80 pixels, providing clear text and basic graphic visualization. The panel includes a membrane keypad with function keys, numeric keys, and system keys for operator input. It supports MPI and PROFIBUS DP communication interfaces for direct integration with SIMATIC S7 controllers, and is configured using WinCC flexible software. The unit operates on a 24 V DC supply and is rated to IP65 at the front panel, making it suitable for installation in control cabinet doors.

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 smaller machines and systems where basic process monitoring, parameter entry, and alarm display are the primary HMI requirements. Industries such as packaging, food and beverage, and general factory automation commonly deploy this panel as a local operator station.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
Permissible Voltage Range	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)
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 OP 77A 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 configuration in WinCC flexible. Ensure the PLC is in RUN mode.
Event ID: 10001: Connection to the configured PLC has been interrupted during operation.
Inspect the communication cable for damage or loose connectors. Check bus termination and cable shielding. Restart the 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 transfer cable is correctly connected. Ensure WinCC flexible is set to the correct transfer mode and that the panel is in transfer mode. Retry the download.
Event ID: 40000: System memory error. The panel has detected an issue with its internal memory or project data.
Perform a panel reset and re-download the project from WinCC flexible. If the error persists, check for project file corruption and consider a factory reset.
Event ID: 50000: Operating system error or firmware fault detected on the panel.
Restart the panel. If the fault recurs, update the panel firmware using the appropriate Siemens ProSave tool and re-download the project.
Event ID: 70000: Configuration mismatch. The loaded project is not compatible with the current panel hardware or firmware version.
Verify the project was compiled for the correct panel type (OP 77A) in WinCC flexible. Update firmware if necessary and re-download a compatible project version.

Frequently Asked Questions

What communication interfaces does the OP 77A (6AV6355-1AA47-7ER1) support?

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

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are downloaded to the panel via a PC adapter cable connected to the MPI or PROFIBUS DP port.

What is the supply voltage for the 6AV6355-1AA47-7ER1?

The panel requires a 24 V DC supply voltage, with a permissible operating range of 19.2 V DC to 28.8 V DC.

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

The front panel of the OP 77A is rated to IP65, making it resistant to dust ingress and low-pressure water jets, suitable for installation in control cabinet doors in industrial environments.

Can the OP 77A be used as a replacement for older SIMATIC HMI panels?

The OP 77A is designed as a successor to earlier SIMATIC OP panels and is compatible with SIMATIC S7 controllers. Migration of existing projects may require adaptation in WinCC flexible due to differences in display resolution and key layout.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Check that the voltage is within the 19.2 V to 28.8 V range. Inspect the supply cable and connector for damage.

Correct the supply voltage if out of range. Replace the power supply cable or connector if damaged. If the supply is confirmed correct and the display remains blank, the internal power supply or display unit may require replacement.

Panel displays 'No connection to PLC' or communication error message

Check the MPI or PROFIBUS DP cable connections at both the panel and PLC ends. Verify bus termination resistors are correctly placed at both ends of the bus segment. Confirm the PLC address and baud rate settings match the WinCC flexible project configuration.

Re-seat or replace the communication cable. Correct bus termination. Adjust the PLC address or baud rate in the WinCC flexible project and re-download. Ensure the PLC is powered and in RUN mode.

Project download fails or transfer cannot be initiated

Confirm the panel is set to transfer mode (accessible via the panel's start center or loader menu). Check that the PC adapter cable is correctly connected and the correct COM port or USB adapter is selected in WinCC flexible.

Switch the panel to transfer mode manually. Install or update the PC adapter drivers on the engineering PC. Retry the download. If the issue persists, perform a panel reset and attempt the transfer again.

Operator keys are unresponsive or intermittently failing

Inspect the membrane keypad for physical damage, contamination, or deformation. Test each key systematically using the panel's built-in key test function if available in the service menu.

Clean the keypad surface with a dry cloth. If individual keys are damaged or non-functional, the membrane keypad assembly should be replaced. Contact a qualified repair technician for keypad replacement on this panel type.

Panel repeatedly restarts or enters a boot loop

Check the supply voltage stability under load. Inspect for any error messages displayed briefly during startup. Attempt to access the panel loader/start center to determine if the issue is firmware or project related.

Stabilize the power supply. Use ProSave to restore or update the panel firmware via the MPI interface. Re-download the project after firmware restoration. If the boot loop continues, the panel may require hardware-level repair or replacement of the main board.

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