Siemens 6AV6355-1AA47-7EM6 OP 77A

€ 1.489,56

SKU: 6AV6355-1AA47-7EM6 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EM6 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 operator unit is part of Siemens' SIMATIC HMI product line and provides a reliable interface for machine-level monitoring and control tasks. It is intended for use with Siemens SIMATIC S7 and other compatible controllers via standard communication interfaces.

The OP 77A features a monochrome LCD display with a resolution of 160 x 80 pixels and a membrane keypad for operator input, providing a robust and straightforward interface without a touchscreen. It supports the MPI and PROFIBUS DP communication protocols, enabling direct integration into existing Siemens automation networks. The panel is configured using Siemens WinCC flexible software and offers sufficient internal memory for storing project data, recipes, and alarm messages. Its compact and rugged construction is suited for panel-mounting in industrial enclosures.

The OP 77A is typically deployed in discrete manufacturing, process automation, and machine building applications where a cost-effective, reliable operator interface is required at the machine level. It is commonly found on packaging machines, conveyor systems, and general-purpose industrial machinery where operators need to monitor process values, acknowledge alarms, and adjust setpoints. Its compatibility with PROFIBUS DP makes it particularly suitable for distributed automation architectures.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Display Size	4 inch
Input Type	Membrane keypad
Communication Interface	MPI, PROFIBUS DP
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.5 W
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
Configuration Software	WinCC flexible 2005 or higher
Certifications	CE, UL, cULus

Common Error Codes and System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC controller
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the configured station address matches the physical device address.
Event ID: 10001: Connection to the PLC has been interrupted or timed out
Check network cabling and connectors. Verify PLC is powered and running. Check communication parameters in the WinCC flexible project.
Event ID: 20000: Project download failed or project data is corrupted
Re-download the project from WinCC flexible. Ensure the correct panel type is selected in the project settings and the transfer cable is properly connected.
Event ID: 40000: Internal memory error or insufficient memory for project data
Check available memory on the panel. Reduce project size or clear unused data. Perform a factory reset if the error persists.
Event ID: 50000: Operating system or firmware error detected
Update the panel firmware using the ProSave tool. If the error persists, perform a factory reset and re-download the project.
Event ID: 60000: Power supply voltage out of specified range
Measure the 24 V DC supply voltage at the panel connector. Ensure the supply is within the specified tolerance range and check for voltage drops under load.
Event ID: 70000: Alarm buffer overflow — too many alarms generated in a short period
Review the alarm configuration in the WinCC flexible project. Increase the alarm buffer size or reduce the frequency of alarm triggers in the PLC program.

Frequently Asked Questions

What communication protocols does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP communication protocols, allowing direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs as well as other PROFIBUS-compatible controllers.

What software is required to configure the 6AV6355-1AA47-7EM6?

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

Does the OP 77A have a touchscreen?

No, the OP 77A uses a membrane keypad for operator input and does not feature a touchscreen. Navigation and data entry are performed using the function and system keys on the keypad.

What is the supply voltage for this panel?

The 6AV6355-1AA47-7EM6 requires a 24 V DC power supply. Ensure the supply voltage remains within the specified tolerance to avoid operational errors.

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

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

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel power connector using a multimeter. Verify that the supply is within the specified range and that the connector is properly seated.

Restore the correct 24 V DC supply voltage. If the supply is correct and the display remains blank, the internal power supply or display unit may be faulty and the panel may require repair or replacement.

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

Verify the MPI or PROFIBUS DP cable is correctly connected and that termination resistors are properly set at both ends of the bus. Check that the station address configured in the WinCC flexible project matches the physical address set on the panel.

Correct any wiring faults and ensure proper bus termination. Adjust the station address settings in the project or on the panel as needed, then re-download the project and restart the panel.

Project download fails or transfer is interrupted

Check the transfer cable connection between the PC and the panel. Ensure the panel is in transfer mode and that the correct communication port and transfer settings are selected in WinCC flexible.

Restart the panel in transfer mode by holding the appropriate key combination during boot. Re-initiate the download from WinCC flexible. If the issue persists, try a different transfer cable or communication port.

Operator keys are unresponsive or produce incorrect input

Inspect the membrane keypad for physical damage, contamination, or wear. 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 keypad membrane assembly will need to be replaced by a qualified technician.

Panel repeatedly restarts or enters a boot loop

This may indicate corrupted project data or a firmware issue. Attempt to access the panel's start center during boot to check for error messages or to initiate a factory reset.

Perform a factory reset via the start center and re-download the project using WinCC flexible. If the boot loop continues, update the panel firmware using the Siemens ProSave tool.

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