Siemens 6AV6355-1AA47-7CA1 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7CA1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CA1 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. It is a compact, key-operated panel designed for machine-level operator control and monitoring tasks. This unit provides a straightforward interface for process visualization and parameter input in automation environments.

The OP 77A features a monochrome STN LCD display with a resolution of 128 x 64 pixels, capable of displaying text and simple graphics. It is equipped with a membrane keypad for operator input, including function keys and system keys. Communication is handled via MPI and PROFIBUS DP interfaces, enabling direct integration with Siemens SIMATIC S7 PLCs. The panel supports configuration via Siemens WinCC flexible software and offers a compact, panel-mount design suitable for control cabinet door installation.

The OP 77A is widely used in manufacturing, machine building, and process automation where a cost-effective, reliable operator interface is required. It is particularly suited for applications involving SIMATIC S7-200, S7-300, and S7-400 PLC systems. Typical installations include packaging machinery, conveyor systems, and general industrial machine control panels.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	128 x 64 pixels
Display Size	3.2 inch
Input Voltage	24 V DC
Power Consumption	4 W (typical)
Communication Interface	MPI / PROFIBUS DP
Configuration Software	WinCC flexible 2005 or higher
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
Series	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Connection to PLC interrupted or PLC not reachable
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify PLC is powered and in RUN mode. Check configured station address matches PLC settings.
Event ID: 10001: Communication timeout with configured controller
Verify communication parameters (baud rate, station address) in WinCC flexible project match PLC configuration. Check cable integrity and bus termination.
Event ID: 20000: Project download failed or project data corrupted
Re-download the WinCC flexible project to the panel. Ensure the correct panel type is selected in the project settings and that the transfer cable is functioning correctly.
Event ID: 40000: Operating system error or firmware fault detected
Perform a panel reset. If the fault persists, update the panel firmware using ProSave or WinCC flexible and re-download the project.
Event ID: 50000: Tag value out of configured limit range
Check the process value limits configured in WinCC flexible for the affected tag. Verify the PLC program is writing values within the expected range.
Event ID: 70000: No project loaded on the panel
Download a valid WinCC flexible project to the panel using the configured transfer interface (MPI or PROFIBUS DP). Ensure transfer mode is enabled on the panel.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

The OP 77A is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP communication interfaces.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or later versions. Projects are downloaded to the panel via the MPI or PROFIBUS DP interface.

What is the supply voltage for the 6AV6355-1AA47-7CA1?

The panel operates on a 24 V DC supply voltage, which is the standard supply for SIMATIC HMI operator panels.

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 installation in environments where dust and water spray may be present.

Can the OP 77A display graphics or only text?

The OP 77A can display both text and simple bitmap graphics on its 128 x 64 pixel monochrome LCD, though it is primarily optimized for text-based operator interaction.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the power connector on the rear of the panel. Check for blown internal fuse or wiring fault.

Ensure the 24 V DC supply is stable and within tolerance. Replace the supply fuse if blown. If the display remains blank with correct supply voltage, the internal power supply or display unit may require replacement.

Panel shows 'No project' or 'Transfer' screen on startup

The panel has no valid project loaded, or it has been reset to transfer mode. This is a configuration state, not a hardware fault.

Download a valid WinCC flexible project to the panel using the MPI or PROFIBUS DP interface. Ensure the correct panel type is selected in the project before downloading.

Communication error displayed — PLC not reachable

Check the MPI or PROFIBUS DP cable connection between the panel and the PLC. Verify bus termination at both ends of the network segment.

Replace or reseat the communication cable. Confirm that the station address and baud rate configured in the WinCC flexible project match the PLC settings. Ensure the PLC is powered and in RUN mode.

Function keys not responding to operator input

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

Clean the keypad surface. If individual keys are unresponsive due to membrane damage, the keypad assembly will need to be replaced. Contact a qualified repair technician for membrane replacement.

Panel repeatedly restarts or enters bootloader mode

This may indicate corrupted firmware or a failed project download. Check if the panel enters a continuous reboot loop or displays a firmware error message.

Use Siemens ProSave tool to restore the panel firmware via the MPI interface. After firmware restoration, re-download the WinCC flexible project. If the issue persists, the panel may require hardware-level repair.

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