Siemens 6AV6355-1AA47-7DA2 OP 77A

€ 2.495,00

SKU: 6AV6355-1AA47-7DA2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7DA2 is a compact operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. It is a key-based 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 160 x 80 pixels, providing clear text and basic graphic visualization. It supports MPI and PROFIBUS DP communication interfaces for direct integration with SIMATIC S7-200, S7-300, and S7-400 controllers. The panel is configured using 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 IP65 on the front face, making it suitable for installation in control cabinet doors.

The OP 77A is widely deployed in manufacturing, packaging, and process automation environments where a cost-effective, reliable operator interface is required at the machine level. Its compact form factor and robust construction make it suitable for installation in tight control cabinet spaces. The panel is commonly found in applications such as conveyor systems, pump stations, and general-purpose machine control where basic status display and parameter entry are sufficient.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Input/Operating Voltage	24 V DC
Power Consumption	4 W (typical)
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)
Mounting	Panel mounting
Configuration Software	WinCC flexible 2005 or higher
Certifications	CE, UL
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Connection to the PLC could not be established or was interrupted.
Check MPI/PROFIBUS cable connections, verify PLC address settings, and confirm the communication parameters in the project configuration match the hardware setup.
Event ID: 10001: Communication timeout with the configured controller.
Verify the PLC is powered and running, check cable integrity, and confirm the baud rate and station address settings on both the panel and PLC.
Event ID: 20000: Project download failed or project data is corrupted.
Re-download the project from WinCC flexible, ensure the correct panel type is selected in the project, and verify USB or serial transfer cable integrity.
Event ID: 40000: Tag read/write error — the configured tag address is invalid or inaccessible.
Check the tag address configuration in WinCC flexible, confirm the PLC data block or memory area exists, and verify the PLC program is running.
Event ID: 50000: System memory low — available panel memory is insufficient for the current project.
Reduce the number of screens, images, or recipe entries in the project, then re-download the project to the panel.
Event ID: 70000: Operating system error or firmware fault detected on the panel.
Perform a panel reset by cycling power. If the fault persists, update the panel firmware using the Siemens ProSave tool or return the unit for service.
Event ID: 60000: Incorrect or missing project — panel has started without a valid loaded project.
Download a valid WinCC flexible project to the panel using the appropriate transfer connection (MPI, serial, or USB adapter).

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7DA2)?

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 and program this operator panel?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later version. Projects are transferred to the panel via MPI, PROFIBUS, or a serial PC/PPI cable.

What is the supply voltage for the 6AV6355-1AA47-7DA2?

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

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

The front face of the OP 77A is rated IP65, making it resistant to dust ingress and low-pressure water jets, suitable for control cabinet door mounting.

Does the OP 77A support touch input?

No, the OP 77A uses a membrane keypad with dedicated function keys for operator input and does not feature a touchscreen.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel power connector. Check for correct polarity. Inspect the supply cable for damage or loose connections.

Ensure a stable 24 V DC supply is present at the connector. If voltage is correct and the display remains blank, the internal power supply or display backlight may have failed — the unit should be inspected and repaired or replaced.

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

Verify the MPI or PROFIBUS DP cable is securely connected at both the panel and PLC ends. Check that the station address and baud rate configured in the WinCC flexible project match the PLC settings.

Correct any address or baud rate mismatches in the project configuration and re-download. Replace the communication cable if damaged. Confirm the PLC is powered on and in RUN mode.

Project download fails or transfer does not complete

Check the transfer cable connection between the PC and the panel. Confirm the panel is in transfer mode (accessible via the panel's start center or loader menu). Verify WinCC flexible project is configured for the correct panel type.

Restart the panel in transfer mode, re-initiate the download from WinCC flexible, and ensure the correct communication port and baud rate are selected in the transfer settings.

Function keys do not respond or produce incorrect actions

Check the project configuration in WinCC flexible to confirm function key assignments are correct. Inspect the membrane keypad for physical damage or contamination under the keys.

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

Panel repeatedly restarts or enters a boot loop

This may indicate corrupted firmware or a failed project download. Attempt to access the panel loader/start center during boot by pressing the appropriate key combination.

Use the Siemens ProSave tool to restore or update the panel firmware via the serial interface. After firmware restoration, re-download the WinCC flexible project to the panel.

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