Siemens 6AV6355-1AA47-7DC4 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7DC4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7DC4 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens as part of the SIMATIC HMI Basic Panels product line. This compact operator panel is designed for machine-level human-machine interface applications, providing a straightforward interface for process visualization and operator control. It is a key component in Siemens' portfolio of entry-level HMI devices intended for use with SIMATIC S7 PLCs and similar controllers.

The OP 77A features a monochrome STN LCD display with a resolution of 160 x 80 pixels and a backlit screen for improved readability in various lighting conditions. It supports communication via MPI and PROFIBUS DP interfaces, enabling direct integration with Siemens S7-200, S7-300, and S7-400 PLC families. The panel is configured using WinCC flexible Compact or Standard engineering software, and supports function keys for operator input without requiring a touchscreen. 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 manufacturing and process automation environments where a cost-effective, reliable operator interface is required at the machine level. Typical applications include conveyor systems, packaging machinery, pump control stations, and general-purpose machine automation. Its compact form factor and robust front-panel protection make it suitable for panel mounting in industrial cabinets and control enclosures across industries such as food and beverage, automotive, and material handling.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Size	4 inch
Input Voltage	24 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)
Mounting	Panel mounting
Configuration Software	WinCC flexible Compact / Standard
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC. The connection to the controller has been lost or cannot be established.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the HMI project configuration. Restart both the HMI and PLC if necessary.
Event ID: 10001: Connection timeout to the configured PLC. The HMI did not receive a response from the controller within the expected time window.
Verify network cabling and bus termination. Check that the PLC is powered on and in RUN mode. Confirm baud rate and station address settings in the HMI project.
Event ID: 20000: Tag read error. The HMI panel was unable to read a configured tag from the PLC.
Check that the tag address in the HMI project corresponds to a valid memory location in the PLC. Verify the PLC program is active and the data block exists.
Event ID: 20001: Tag write error. The HMI panel was unable to write a value to the configured PLC tag.
Confirm the PLC memory area is not write-protected. Check the tag address configuration in WinCC flexible and ensure the PLC is in a state that accepts write commands.
Event ID: 40000: Project download error. A fault occurred during the transfer of the HMI project from the engineering PC to the panel.
Check the PC-to-panel communication cable and interface settings. Ensure WinCC flexible version is compatible with the panel firmware. Retry the download after restarting the panel in transfer mode.
Event ID: 50000: System memory low. The HMI panel is reporting insufficient memory resources to execute the loaded project.
Reduce the number of screens, tags, or graphical elements in the project. Recompile and re-download the project. If the issue persists, consider upgrading to a panel with greater memory capacity.
Event ID: 60000: Internal device fault. A general hardware or firmware error has been detected within the HMI panel.
Perform a power cycle of the panel. If the fault persists, update the panel firmware using WinCC flexible. Contact Siemens technical support or arrange for panel repair if the fault remains unresolved.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7DC4)?

The OP 77A is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP communication interfaces. It can also communicate with other controllers that support these protocols.

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

The OP 77A is configured using Siemens WinCC flexible Compact or WinCC flexible Standard engineering software. Projects are downloaded to the panel via a PC adapter or MPI/PROFIBUS connection.

What is the supply voltage for the 6AV6355-1AA47-7DC4?

The panel operates on a 24 V DC supply voltage, which is standard for SIMATIC HMI Basic Panels.

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

The front panel of the OP 77A is rated IP65, providing protection against dust ingress and low-pressure water jets, making it suitable for industrial panel mounting environments.

Does the OP 77A support touchscreen input?

No, the OP 77A does not feature a touchscreen. Operator input is performed via dedicated function keys and navigation keys located on the front of the panel.

Troubleshooting

Display remains blank after power on

Check that 24 V DC is present at the power supply terminals of the panel. Measure voltage at the connector and inspect the supply cable for damage. Verify the internal fuse if accessible.

Restore correct 24 V DC supply. Replace any blown fuse with the correct rating. If the display backlight has failed, the panel may require backlight replacement or full unit repair.

HMI panel shows 'No connection to PLC' message on screen

Verify the MPI or PROFIBUS DP cable is securely connected at both the panel and PLC ends. Check bus termination resistors are correctly installed at both ends of the network. Confirm the station address and baud rate settings match between the HMI project and PLC configuration.

Reseat all communication cables and ensure correct termination. Correct any address or baud rate mismatches in the WinCC flexible project and re-download. Replace the communication cable if continuity testing reveals a fault.

Panel does not enter transfer mode for project download

Confirm the panel is being restarted correctly to enter transfer mode, typically by holding the appropriate key combination during power-up. Check that the PC adapter or communication interface is correctly configured in WinCC flexible.

Follow the OP 77A operating instructions for initiating transfer mode. Ensure the correct COM port or USB adapter is selected in the WinCC flexible transfer settings. Update or reinstall the PC adapter driver if the connection is not recognized.

Function keys do not respond to operator input

Inspect the front panel keypad for physical damage or contamination. Check the HMI project to confirm that the function keys have been assigned to actions in WinCC flexible. Verify the project has been correctly downloaded to the panel.

Clean the keypad area and remove any obstructions. Re-download the project with correct function key assignments. If keys remain unresponsive after software verification, the keypad membrane may require replacement.

Panel repeatedly restarts or reboots unexpectedly

Check the 24 V DC supply for voltage dips or instability using a multimeter or oscilloscope. Inspect the power supply cable and connector for loose connections. Review the HMI project for any configuration errors that could cause a runtime fault.

Stabilize the power supply and ensure it is rated for the panel's power consumption. Secure all wiring connections. Re-download a verified project to the panel. If reboots continue, the internal power supply board may be faulty and require repair or replacement.

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