Siemens 6AV6355-1AA47-7EC3 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7EC3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EC3 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for machine-level human-machine interface applications. This compact panel provides a keypad-based interface for monitoring and controlling industrial processes and is part of Siemens' SIMATIC HMI product line. It is intended for use with Siemens SIMATIC S7 and other compatible PLC families.

The OP 77A features a monochrome LCD display and a membrane keypad with function keys for navigation and process control. It supports MPI and PROFIBUS DP communication interfaces, enabling direct integration with SIMATIC S7-200, S7-300, and S7-400 controllers. The panel is configured using Siemens WinCC flexible software and supports alarm management, recipe handling, and trend display functions within its onboard memory capacity.

The OP 77A is commonly deployed in manufacturing, packaging, and process automation environments where a cost-effective, robust operator interface is required at the machine level. Its compact form factor and keypad-only operation make it suitable for installations where touchscreen interfaces are not practical, such as dusty or high-vibration environments. The panel is widely used in conveyor systems, pumping stations, and general-purpose machine control applications.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
Power Consumption	Max. 4.5 W
Communication Interface	MPI, PROFIBUS DP
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
Configuration Software	WinCC flexible 2008 or higher

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 and baud rate settings match the panel 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 for electromagnetic interference sources near the cable routing. Re-establish the connection and monitor for recurring faults.
Event ID: 20000: Configuration error detected. The project loaded on the panel is incompatible or corrupt.
Re-download the project from WinCC flexible to the panel. Verify the project was compiled without errors before transfer.
Event ID: 40000: Internal device error. A hardware fault has been detected within the panel.
Cycle power to the panel. If the error persists, perform a factory reset. If the fault remains, the panel may require repair or replacement.
Event ID: 50000: Memory error. The panel has detected a fault in its internal memory or the loaded project data is corrupted.
Re-transfer the project to the panel using WinCC flexible. If the error persists, perform a factory reset and reload the project.
Event ID: 70000: Operating system error. The panel firmware may be corrupted or incompatible with the loaded project.
Update the panel firmware to the version compatible with the WinCC flexible project. Use the Siemens ProSave tool to restore or update the operating system.

Frequently Asked Questions

Which communication interfaces does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP communication interfaces, allowing direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs.

Which software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are downloaded to the panel via the MPI interface or a PC adapter cable.

What is the supply voltage for the 6AV6355-1AA47-7EC3?

The panel requires a 24 V DC supply voltage for operation.

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

The front panel of the OP 77A carries an IP65 protection rating, making it suitable for environments where dust and water spray may be present.

Can the OP 77A be used with third-party PLCs?

The OP 77A is primarily designed for use with Siemens SIMATIC controllers via MPI or PROFIBUS DP. Connectivity to third-party PLCs depends on PROFIBUS DP compatibility and available WinCC flexible drivers.

Troubleshooting

Display remains blank after power on

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

Ensure the 24 V DC supply is stable and correctly connected. If the supply is correct and the display remains blank, the internal power supply or backlight may be faulty and the panel should be sent for repair.

Panel shows communication error and cannot connect to PLC

Verify the MPI or PROFIBUS DP address configured in the panel matches the PLC settings. Inspect the communication cable for continuity and correct termination at both ends of the bus.

Correct any address mismatches in the WinCC flexible project and re-download. Replace damaged cables and ensure bus termination resistors are correctly installed at both ends of the network.

Panel repeatedly restarts or enters a boot loop

This may indicate a corrupted operating system or project file on the panel. Attempt to access the panel's loader menu during startup by pressing the appropriate key combination.

Use the Siemens ProSave tool to restore the panel operating system via the MPI interface. After OS restoration, re-download the WinCC flexible project to the panel.

Function keys do not respond or respond incorrectly

Inspect the membrane keypad for physical damage, contamination, or deformation. Test each key in the panel's service or test mode if available.

Clean the keypad surface with a dry cloth. If keys remain unresponsive, the membrane keypad assembly may need replacement. Contact a qualified repair technician for keypad replacement.

Project download from WinCC flexible fails

Check the PC adapter cable connection between the engineering PC and the panel MPI port. Verify the correct COM port and transfer speed are selected in WinCC flexible transfer settings.

Try a different PC adapter cable or USB-to-MPI adapter. Ensure the panel is in transfer mode before initiating the download. Reinstall the PC adapter driver if communication cannot be established.

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