Siemens 6AV6355-1AA47-7BC2 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7BC2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7BC2 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 process visualization and operator control, and is part of Siemens' SIMATIC HMI product line. It is intended for use in industrial environments where reliable, straightforward operator interaction is required without the need for a full touchscreen display.

The OP 77A features a monochrome STN LCD display with a resolution of 128 x 64 pixels, providing clear readout of process values, alarms, and status messages. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration with SIMATIC S7 PLCs. The panel supports configuration through WinCC flexible software and offers a membrane keypad with function keys for operator input. It operates on a 24 V DC supply and is rated to IP65 on the front face, making it suitable for panel-mount installations in demanding environments.

The OP 77A is commonly deployed in machine building, conveyor systems, packaging machinery, and process automation where a cost-effective, robust operator terminal is needed. Its compact form factor and compatibility with the SIMATIC S7 controller family make it a practical choice for OEMs and system integrators requiring a reliable front-panel interface. The panel is well suited for applications where alphanumeric display of process data and alarm management are the primary requirements.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	128 x 64 pixels
Keypad	Membrane keypad with function keys
Input Voltage	24 V DC
Communication Interface	MPI, PROFIBUS DP
IP Rating (Front)	IP65
IP 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
Mounting	Panel mount
Certifications	CE, UL
Series	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Connection to PLC interrupted or communication timeout on MPI/PROFIBUS DP interface.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify PLC is powered and in RUN mode. Check configured station address matches the PLC.
Event ID: 10001: No connection to configured PLC at startup.
Verify communication parameters (baud rate, station address) in the project configuration match the PLC settings. Check physical wiring.
Event ID: 20000: Project download failed or project data corrupted.
Re-download the project from WinCC flexible to the panel. Ensure the correct panel type is selected in the project settings.
Event ID: 40000: System memory low or insufficient memory for project data.
Reduce the size of the project (number of screens, variables, or alarm entries) and re-download. Check panel memory specifications against project requirements.
Event ID: 50000: Internal device error or hardware fault detected.
Perform a factory reset of the panel. If the fault persists, the unit may require repair or replacement of internal components.
Event ID: 60000: Operating system error or firmware mismatch detected.
Update the panel firmware using the appropriate Siemens ProSave tool. Ensure firmware version is compatible with the WinCC flexible project version.
Event ID: 70000: Alarm buffer overflow — too many pending alarms.
Acknowledge and clear existing alarms. Review alarm configuration to reduce simultaneous alarm generation. Increase alarm buffer size in project settings if possible.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

The OP 77A is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP communication interfaces. It can also communicate with S7-200 via PPI protocol.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible software. The project is then downloaded to the panel via a PC/PPI or MPI cable.

What is the supply voltage for the 6AV6355-1AA47-7BC2?

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

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

The OP 77A has an IP65 protection rating on the front face when correctly installed in a panel cutout, making it resistant to dust and water jets.

Can the OP 77A display graphics or only text?

The OP 77A features a 128 x 64 pixel monochrome LCD that supports both text and simple bitmap graphics, allowing basic process visualization alongside alphanumeric data.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the power connector. Check that the supply is within the specified tolerance. Inspect the internal fuse if accessible.

Restore correct 24 V DC supply. If supply is confirmed correct and display remains blank, the internal power supply or display backlight may be faulty and the unit should be sent for repair.

Panel shows 'No connection to PLC' message

Check the MPI or PROFIBUS DP cable for continuity and correct pin assignment. Verify bus termination resistors are enabled at both ends of the bus. Confirm the PLC station address matches the project configuration.

Replace or reseat the communication cable. Correct the station address and baud rate settings in the WinCC flexible project and re-download. Enable bus termination on the panel and PLC if they are at the ends of the bus segment.

Project download fails from WinCC flexible

Verify the communication cable type (PC/PPI or MPI adapter) is correctly configured in WinCC flexible transfer settings. Check that the panel is in transfer mode.

Set the panel to transfer mode via the Start Center menu. Ensure the correct COM port and transfer speed are selected in WinCC flexible. Re-attempt the download.

Function keys do not respond or produce incorrect actions

Check the project configuration to confirm function key assignments are correctly mapped to the intended actions. Inspect the membrane keypad for physical damage or contamination.

Re-download the project with corrected key assignments. If the keypad is physically damaged or keys are unresponsive due to wear, the membrane keypad assembly should be replaced.

Panel restarts repeatedly or enters a boot loop

This may indicate corrupted project data or a firmware issue. Attempt to access the Start Center during boot by pressing the appropriate key combination.

Use Siemens ProSave to perform a firmware update or restore factory settings. Re-download the project from WinCC flexible after the panel has been successfully reset.

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