Siemens 6AV6355-1AA47-7CC4 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7CC4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CC4 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for human-machine interface applications in industrial automation environments. This unit is part of Siemens' compact operator panel lineup, providing a robust and reliable interface for machine-level control and monitoring. It is compatible with the SIMATIC automation platform and integrates seamlessly with Siemens S7 PLCs and other controllers.

The OP 77A features a monochrome STN LCD display with a resolution of 128 x 64 pixels, offering clear visualization of process data, alarms, and status information. The panel supports key-based operation with dedicated function keys and system keys, enabling efficient navigation without a touchscreen. It communicates via MPI and PROFIBUS DP interfaces, allowing direct connection to SIMATIC S7-200, S7-300, and S7-400 controllers. Configuration is performed using WinCC flexible software, and the unit operates on a 24 V DC supply voltage.

The OP 77A is widely used in machine building, manufacturing automation, and process control applications where a compact, cost-effective operator interface is required. Its rugged construction and panel-mount design make it suitable for integration into control cabinets and machine panels in industries such as automotive, food and beverage, packaging, and general manufacturing. The keypad-based interface is particularly suited to environments where touchscreen operation is impractical due to gloves or contamination.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	128 x 64 pixels
Display Size	4 inches (diagonal)
Operating Voltage	24 V DC
Voltage Tolerance	19.2 V DC – 28.8 V DC
Communication Interface	MPI, PROFIBUS DP
Configuration Software	WinCC flexible 2008 or later
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, cULus
Series	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 1003: No connection to PLC. The operator panel cannot establish communication with the configured controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the configuration in WinCC flexible. Ensure the PLC is powered and running.
Event ID: 1004: Connection to PLC interrupted. An established communication link has been lost during operation.
Inspect cable integrity and connector seating. Check for electromagnetic interference sources near the communication cable. Verify PLC is still operational and not in fault state.
Event ID: 10000: System startup. The HMI device has completed its boot sequence and is initializing the project.
No action required. This is an informational event indicating normal startup. If the panel does not proceed to the project screen, check project integrity and reload via WinCC flexible.
Event ID: 20000: Project transfer active. The panel is receiving a new project download from the configuration PC.
No action required during intentional transfers. If unexpected, check network connections and ensure no unauthorized access to the panel's transfer mode.
Event ID: 40000: Operating system update in progress. A firmware update is being applied to the device.
Do not interrupt power during this process. Ensure the correct firmware version is being applied for the OP 77A hardware revision.
Event ID: 70010: Alarm buffer overflow. The number of pending alarms has exceeded the buffer capacity of the panel.
Acknowledge and clear existing alarms. Review the alarm configuration in WinCC flexible to reduce the number of simultaneously active alarms or increase acknowledgment frequency.
Event ID: 50000: Illegal system activity detected. An internal system error has occurred within the HMI runtime.
Restart the operator panel. If the error persists, reload the project using WinCC flexible. Check for project configuration errors or corrupted project data.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7CC4)?

The OP 77A is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with other controllers supported by WinCC flexible drivers.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are created on a PC and transferred to the panel via a PC/PPI cable or MPI connection.

What is the supply voltage for the 6AV6355-1AA47-7CC4?

The panel requires a 24 V DC supply voltage with an acceptable range of 19.2 V DC to 28.8 V DC.

Does the OP 77A support touchscreen operation?

No, the OP 77A is a keypad-operated panel. It uses dedicated function keys and system keys for navigation and input, and does not feature a touchscreen.

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 resistant to dust ingress and low-pressure water jets when correctly installed in a panel cutout.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the power connector. Check that the voltage is within the 19.2 V to 28.8 V range. Inspect the internal fuse if accessible.

Restore correct supply voltage if out of range. Replace any blown fuse with the correct rating. If the display remains blank with correct power, the internal power supply or display backlight may require replacement.

Panel displays 'No connection to PLC' message

Verify the MPI or PROFIBUS DP address configured in the WinCC flexible project matches the physical PLC address. Check cable connections at both the panel and PLC ends, and confirm bus termination is correctly applied.

Correct any address mismatches in the WinCC flexible project and retransfer. Replace or reseat communication cables. Ensure only the two physical ends of the bus have termination resistors enabled.

Project transfer from PC fails or times out

Check the communication cable between the PC and the OP 77A. Verify the panel is in transfer mode, which can be activated via the panel's start center or by holding the appropriate key combination during boot.

Replace the PC/MPI cable if faulty. Ensure the correct COM port and transfer settings are selected in WinCC flexible. Restart both the panel and the PC before retrying the transfer.

Function keys do not respond or produce incorrect actions

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

Retransfer the correct project to the panel. If keys are physically damaged or unresponsive due to wear, the keypad membrane assembly should be replaced.

Panel reboots repeatedly or fails to load project

Attempt to access the panel's start center during boot. Check whether the project loads correctly or produces an error message. This may indicate a corrupted project or a failing internal memory component.

Reload the project from WinCC flexible. If the issue persists after reloading, perform a factory reset via the start center and retransfer the project. Persistent reboots after reset may indicate a hardware fault requiring repair or unit replacement.

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