Siemens 6AV6355-1AA47-7CA2 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7CA2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CA2 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 provides a keypad-based interface for machine operation and process visualization, and is part of Siemens' established SIMATIC HMI product line. It is intended for use with Siemens SIMATIC S7 PLCs and compatible controllers via standard communication interfaces.

The OP 77A features a monochrome LCD display with a resolution suitable for text and simple graphic representation, along with a membrane keypad for operator input. It supports MPI and PROFIBUS DP communication protocols, enabling direct integration into existing Siemens automation networks. The panel is configured using Siemens WinCC flexible software and supports tag-based data exchange, alarm management, and recipe handling within its onboard memory capacity.

The OP 77A is commonly deployed in machine-level control panels across manufacturing, packaging, food and beverage, and general industrial automation applications. Its compact form factor and keypad-based design make it well suited for environments where a full touchscreen is not required and where robust, straightforward operator interaction is preferred. The panel is typically mounted in control cabinet doors or machine enclosures where space is limited.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
Input/Operating Voltage	24 V DC
Power Consumption	Max. 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 Protection Rating	IP65 (front panel)
Mounting	Panel mounting
Series/Product Family	SIMATIC HMI OP 77A
Configuration Software	WinCC flexible 2008 or higher
Certifications	CE, UL

Common Error Codes and 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 settings match the panel configuration. Ensure the PLC is in RUN mode.
Event ID: 10001: Connection to the configured PLC was interrupted during operation.
Inspect communication cables for damage or loose connectors. Check network topology and bus termination. Restart the panel and PLC if the connection is not restored automatically.
Event ID: 20000: Configuration or project download error. The project loaded onto the panel is incompatible or corrupted.
Re-download the project from WinCC flexible to the panel. Verify that the WinCC flexible version matches the firmware version of the panel.
Event ID: 40000: System memory low. Available memory on the panel is insufficient to load or run the current project.
Reduce the project size by removing unused screens, tags, or alarms. Ensure the project is compiled and optimized before downloading.
Event ID: 50000: Firmware update error. The firmware update process was interrupted or failed.
Repeat the firmware update procedure using the correct firmware version for the OP 77A. Ensure stable power supply during the update process.
Event ID: 70000: Tag acquisition error. One or more configured tags cannot be read from the PLC.
Verify that the tag addresses in the WinCC flexible project match the actual PLC data block or memory addresses. Check PLC program for address changes.

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.

What software is used to configure the Siemens 6AV6355-1AA47-7CA2?

The panel is configured using Siemens WinCC flexible software. The project is then downloaded to the panel via the MPI interface or a PC adapter cable.

What is the supply voltage for the OP 77A?

The OP 77A operates on a 24 V DC supply voltage, which is standard for SIMATIC HMI panels.

What is the IP protection rating of the OP 77A?

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

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

The OP 77A is primarily designed for use with Siemens SIMATIC S7 PLCs via MPI or PROFIBUS DP. Connectivity to third-party controllers is generally not supported without specific driver configurations.

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 voltage range and that the connector is properly seated.

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

Panel shows 'No connection to PLC' message

Verify the MPI or PROFIBUS DP cable is connected to the correct port on both the panel and the PLC. Check the bus address configured in the WinCC flexible project against the actual PLC address.

Correct any address mismatches in the project configuration and re-download. Replace the communication cable if damaged. Ensure bus termination resistors are correctly placed at both ends of the network.

Operator keys do not respond or respond incorrectly

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

Clean the keypad surface with a dry cloth. If keys remain unresponsive, the membrane keypad assembly may need to be replaced by a qualified technician.

Project cannot be downloaded to the panel

Check the PC-to-panel communication cable and the PC adapter settings. Verify that the correct COM port and transfer rate are selected in WinCC flexible. Ensure the panel is in transfer mode.

Switch the panel to transfer mode via the panel's start screen. Use the correct Siemens PC adapter (USB or MPI) and verify driver installation on the PC. Retry the download with the correct project settings.

Alarms are not displayed on the panel

Check the alarm configuration in the WinCC flexible project to ensure alarm tags are correctly mapped to PLC addresses. Verify that the PLC is setting the alarm bits as expected.

Correct any tag address mismatches in the alarm configuration and re-download the project. Confirm the PLC program logic is triggering the alarm bits correctly during the fault condition.

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