Siemens 6AV6355-1AA47-7CK2 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7CK2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CK2 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 operator unit is part of Siemens' SIMATIC HMI product line and provides a robust interface for machine-level monitoring and control. It is intended for use with Siemens SIMATIC S7 and other compatible PLC families.

The OP 77A features a monochrome LCD display with a resolution of 160 x 80 pixels and supports key-based operation through dedicated function keys and system keys. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration into Siemens automation networks. The unit operates on a 24 V DC supply and is built to withstand industrial environments, carrying a front panel protection rating of IP65.

The OP 77A is widely deployed in manufacturing, machine building, and process automation applications where a compact, cost-effective operator interface is required. Its small footprint makes it suitable for integration into control cabinets and machine panels with limited space. Industries such as automotive, food and beverage, packaging, and general factory automation commonly use this panel for local operator interaction with PLCs and control systems.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Operating Voltage	24 V DC
Voltage Tolerance	19.2 V DC to 28.8 V DC
Power Consumption	Approx. 3 W
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
Certifications	CE, UL
Series	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Communication error between the operator panel and the connected PLC or controller.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration.
Event ID: 10001: Connection to the configured PLC has been interrupted or lost.
Inspect physical communication cables for damage. Confirm the PLC is powered and running. Re-establish the connection via the panel's communication settings.
Event ID: 20000: Project download error — the project could not be transferred to the panel.
Verify the transfer cable and PC connection. Ensure the panel is in transfer mode and that the correct COM port or network interface is selected in WinCC flexible.
Event ID: 40000: System memory low — available memory on the panel is insufficient.
Delete unused projects or data from the panel. Reduce the size of the project being loaded or clear the panel memory before re-downloading.
Event ID: 50000: Operating system error or internal panel fault detected.
Perform a panel reset by cycling power. If the fault persists, perform a factory reset or update the panel firmware using the appropriate Siemens ProSave tool.
Event ID: 60000: Configuration error — the loaded project is incompatible with the panel hardware or firmware version.
Verify the project was compiled for the OP 77A panel type. Update the panel firmware to match the WinCC flexible project version and re-download the project.
Event ID: 70000: Backup/restore error during project or data transfer operation.
Check the integrity of the backup file. Ensure sufficient memory is available on the panel and retry the restore operation using ProSave.

Frequently Asked Questions

What communication interfaces does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP communication interfaces, allowing direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs as well as other PROFIBUS-compatible controllers.

What software is used to configure and program the OP 77A?

The OP 77A is configured using Siemens WinCC flexible software. Projects are created on a PC and then downloaded to the panel via a suitable transfer cable or network connection.

What is the supply voltage for the 6AV6355-1AA47-7CK2?

The panel operates on 24 V DC with a permissible voltage range of 19.2 V DC to 28.8 V DC.

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 environments where dust and water spray may be present.

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

The OP 77A is primarily designed for use with Siemens SIMATIC PLCs via MPI and PROFIBUS DP. Connectivity to third-party controllers is possible via PROFIBUS DP if the controller supports the protocol, but compatibility should be verified against the specific controller's documentation.

Troubleshooting

Display remains blank after power is applied

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

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

Panel displays a communication error and cannot connect to the PLC

Check the MPI or PROFIBUS DP cable for physical damage, loose connectors, and correct termination at both ends of the bus. Verify the panel's configured PLC address and baud rate match the PLC settings.

Replace or reseat the communication cable. Correct the address and baud rate settings in the panel configuration. Ensure bus termination resistors are correctly placed at both ends of the network.

Project download fails or transfer cannot be initiated

Confirm the panel is set to transfer mode via the panel's start center or loader menu. Check the PC-to-panel cable connection and verify the correct interface is selected in WinCC flexible.

Switch the panel to transfer mode manually. Use a known-good MPI or PC adapter cable. Reinstall the WinCC flexible communication driver on the PC if the interface is not recognized.

Function keys do not respond or produce incorrect actions

Check the project configuration in WinCC flexible to confirm the correct key assignments are programmed. Test individual keys to determine if the issue is hardware or software related.

Re-download the project with corrected key assignments. If keys are physically unresponsive, inspect the keypad membrane for damage or contamination and replace the keypad assembly if necessary.

Panel repeatedly restarts or shows a system fault after startup

Check for firmware version mismatches between the loaded project and the panel OS. Inspect the supply voltage for instability or voltage dips during startup.

Update the panel firmware using Siemens ProSave to match the project's target version. Stabilize the 24 V DC supply. If the issue persists, perform a factory reset and re-download the project.

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