Siemens 6AV6355-1AA47-7DE0 OP 77A

€ 955,52

SKU: 6AV6355-1AA47-7DE0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7DE0 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. It is a compact, key-operated operator panel designed for machine-level human-machine interface applications, providing a straightforward interface for process monitoring and control. This unit is part of the SIMATIC HMI Basic Panels generation, intended for use with Siemens SIMATIC S7 PLCs and compatible controllers.

The OP 77A features a monochrome LCD display with a resolution of 128 x 64 pixels, capable of displaying text and simple graphics. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration into Siemens automation networks. The panel supports configuration through Siemens WinCC flexible software and offers function keys for operator input, along with LED indicators for status feedback. The unit operates on a 24 V DC supply and is designed for panel mounting with an IP65 protection rating on the front face.

The OP 77A is widely used in manufacturing, machine building, and process automation environments where a cost-effective, robust operator interface is required at the machine level. It is suitable for applications such as conveyor systems, packaging machinery, and general industrial automation where basic process visualization and parameter entry are needed. Its compact form factor and compatibility with the SIMATIC ecosystem make it a practical choice for retrofitting or extending existing Siemens-based control systems.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	128 x 64 pixels
Input Voltage	24 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)
Mounting	Panel mounting
Configuration Software	WinCC flexible 2005 or higher
Series	SIMATIC HMI OP 77A
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Connection to PLC lost or communication timeout on MPI/PROFIBUS DP interface.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify PLC is powered and running. Check configured station address and baud rate in WinCC flexible project.
Event ID: 10001: Connection to PLC established after a previous loss of communication.
Informational event. No corrective action required. Monitor for repeated disconnections which may indicate network instability.
Event ID: 20000: Project download error or project data corrupted on the operator panel.
Re-download the WinCC flexible project to the panel. Verify the project is compiled without errors before transfer. Check the transfer cable or network connection used for download.
Event ID: 40000: Operating system or firmware error detected on the panel.
Perform a panel reset. If the fault persists, update the panel firmware using the appropriate Siemens ProSave tool or WinCC flexible.
Event ID: 50000: Configuration error: tag or variable referenced in the project cannot be found or is incorrectly configured.
Review the WinCC flexible project for missing or incorrectly mapped tags. Recompile and re-download the project to the panel.
Event ID: 60000: Panel internal memory error or data loss detected.
Perform a factory reset of the panel. Re-download the project. If the error persists, the panel may require hardware repair or replacement.
Event ID: 70000: Power supply undervoltage detected; supply voltage dropped below the minimum threshold.
Measure the 24 V DC supply voltage at the panel connector. Ensure the power supply unit is rated adequately for the load. Check wiring for voltage drop.

Frequently Asked Questions

What communication interfaces does the OP 77A (6AV6355-1AA47-7DE0) 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 as well as other PROFIBUS DP-compatible controllers.

What software is required to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are compiled in WinCC flexible and downloaded to the panel via MPI, PROFIBUS DP, or a direct PC adapter connection.

What is the supply voltage for the 6AV6355-1AA47-7DE0?

The panel requires a 24 V DC supply voltage. Ensure the power source is within the specified tolerance range to avoid undervoltage faults.

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

The front face of the OP 77A carries an IP65 protection rating, making it suitable for panel-mount installations where protection against dust and water jets is required.

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

The OP 77A is designed as a successor to earlier SIMATIC HMI operator panels such as the OP7 and OP17. Existing projects may require adaptation in WinCC flexible before downloading to the OP 77A.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel power connector. Check for blown internal fuse or wiring fault. Verify the power supply unit output is within tolerance.

Correct any wiring faults and ensure the supply voltage is stable at 24 V DC. If the display remains blank with correct supply voltage, the panel may have a failed backlight or internal power supply board requiring hardware repair.

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

Check MPI or PROFIBUS DP cable connections at both the panel and PLC. Verify bus termination is correctly applied at both ends of the network. Confirm the station address and baud rate configured in the WinCC flexible project match the PLC settings.

Correct any cable faults, ensure proper bus termination, and verify address and baud rate settings. Re-download the project if configuration changes are made.

Project download fails or panel does not accept new project

Verify the PC adapter or transfer cable is correctly connected and the correct COM port or USB driver is selected. Check that the panel is set to transfer mode. Confirm WinCC flexible project compiles without errors.

Set the panel to transfer mode via the Start Center menu. Reinstall the PC adapter driver if necessary. Recompile the project and retry the download.

Function keys do not respond or produce incorrect actions

Check the WinCC flexible project for correct function key assignments. Inspect the keypad membrane for physical damage or contamination. Verify the panel firmware version is compatible with the project.

Correct function key assignments in the WinCC flexible project and re-download. If physical key damage is confirmed, the keypad membrane or front panel assembly requires replacement.

Panel repeatedly restarts or enters a boot loop

Check the 24 V DC supply for voltage instability or excessive ripple. Inspect for corrupted project data on the panel. Attempt to access the Start Center during boot to determine if the panel firmware is intact.

Stabilize the power supply. Perform a factory reset via the Start Center and re-download the project. If the boot loop persists, update or restore the panel firmware using Siemens ProSave.

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