Siemens 6AV6355-1AA47-7CL1 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7CL1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CL1 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens as part of the SIMATIC HMI Basic Panels product family. This compact operator panel is designed for machine-level human-machine interface applications, providing operators with a straightforward interface for monitoring and controlling automated processes. The OP 77A series is a successor to the OP 77 line and is engineered for integration into standard control panel cutouts.

The OP 77A features a monochrome STN LCD display and a membrane keypad with function keys, numeric keys, and system keys for navigation and data entry without requiring a touchscreen. It supports the MPI and PROFIBUS DP communication interfaces, enabling direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and offers a defined number of tags, screens, and alarms suited to small and medium-scale machine applications. It operates on a 24 V DC supply and is rated IP65 on the front face for protection against dust and water ingress.

The OP 77A is widely deployed in machine building, packaging machinery, conveyor systems, and general factory automation where a cost-effective, robust operator interface is required. Its compact form factor and standard panel cutout dimensions make it suitable for integration into existing control cabinets with minimal modification. The keypad-based operation is particularly valued in environments where touchscreen operation is impractical due to gloves, vibration, or contamination.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 inches
Input Voltage	24 V DC
Voltage Range	19.2 V DC – 28.8 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 2008 or later
Mounting	Panel mounting
Certifications	CE, UL, cULus
Series	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC. The panel cannot establish or maintain a connection to the configured controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the HMI project configuration. Ensure the PLC is in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during runtime operation.
Inspect the communication cable for damage or loose connectors. Check the PROFIBUS/MPI network for address conflicts. Restart both the HMI panel and the PLC if the connection does not recover automatically.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel successfully.
Verify the PC-to-panel connection (MPI or USB/serial adapter). Ensure the WinCC flexible project is compiled without errors before transfer. Check that the correct panel type is selected in the project settings.
Event ID: 40000: System memory low. The panel's available runtime memory is insufficient to load all configured screens or data.
Reduce the number of active screens, alarms, or tags in the WinCC flexible project. Optimize graphics and screen objects to reduce memory usage. Reload the project after optimization.
Event ID: 50000: Configuration error detected. The loaded project contains settings incompatible with the panel firmware version.
Update the panel firmware to the version required by the WinCC flexible project. Alternatively, recompile the project targeting the installed firmware version and re-download.
Event ID: 60000: Internal device error or hardware fault detected on the operator panel.
Perform a panel reset by cycling power. If the fault persists, back up the project and perform a factory reset. Contact Siemens technical support or arrange for panel repair if the error recurs after reset.
Event ID: 70000: Tag limit exceeded. The number of configured tags in the project exceeds the maximum supported by this panel variant.
Review the WinCC flexible project and reduce the number of configured tags to within the panel's licensed tag limit. Consolidate tags where possible or upgrade to a higher-specification panel.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A panel?

The OP 77A supports direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It is not natively compatible with non-Siemens controllers without additional configuration.

What software is used to configure the 6AV6355-1AA47-7CL1?

The panel is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are compiled and downloaded to the panel via MPI adapter or serial connection.

Does the OP 77A have a touchscreen?

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

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

The front face of the OP 77A is rated IP65, providing full protection against dust ingress and protection against low-pressure water jets. The rear of the unit is rated IP20.

Can the OP 77A panel be used as a replacement for older OP 77 panels?

The OP 77A is designed as a functional successor to the OP 77 and shares a similar panel cutout, making it a suitable replacement in many installations. However, the project configuration must be adapted in WinCC flexible to target the OP 77A hardware.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Verify the voltage is within the 19.2 V to 28.8 V DC operating range. Check the supply cable and connector for damage or loose termination.

Correct the supply voltage if out of range. Replace the power supply cable or connector if damaged. If the supply is confirmed correct and the display remains blank, the internal power supply or display backlight may have failed and the unit should be sent for repair.

Panel displays 'No connection to PLC' or communication alarm at startup

Check the MPI or PROFIBUS DP cable between the panel and the PLC. Verify bus termination is correctly applied at both ends of the network. Confirm the PLC address and baud rate in the HMI project match the actual PLC configuration.

Replace or reseat the communication cable. Correct any address or baud rate mismatches in the WinCC flexible project and re-download. Ensure termination resistors are enabled only at the physical ends of the bus segment.

Project download fails or transfer is interrupted

Check the PC-to-panel connection via MPI adapter or serial cable. Verify the WinCC flexible project compiles without errors and that the correct panel type (OP 77A) is selected as the target device.

Resolve any project compilation errors before attempting transfer. Use a known-good MPI adapter and cable. If the panel is unresponsive, perform a panel reset by cycling power and retry the download in transfer mode.

Keypad buttons are unresponsive or intermittently fail

Inspect the membrane keypad surface for physical damage, contamination, or deformation. Test each key systematically in the panel's built-in key test mode if available. Check whether the issue is limited to specific keys or affects all keys.

Clean the keypad surface with a dry cloth to remove contamination. If specific keys are physically damaged or the membrane is torn, the keypad membrane assembly must be replaced. For a unit where all keys are unresponsive, check internal ribbon cable connections between the keypad and the main board.

Panel reboots repeatedly or fails to load the runtime project

Check for Event ID errors displayed during the boot sequence. Verify the downloaded project is compatible with the installed firmware version. Inspect the 24 V DC supply for voltage drops or instability under load.

Ensure the firmware version matches the WinCC flexible project requirements and update if necessary. Stabilize the power supply by checking cable sizing and supply unit capacity. If the panel continues to reboot, perform a factory reset and re-download the project.

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