Siemens 6AV6641-5AC10-0KR0 OP 77A

€ 369,00

SKU: 6AV6641-5AC10-0KR0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6641-5AC10-0KR0 is an Operator Panel (OP 77A) belonging to the SIMATIC HMI Basic Panels product family. It is a compact, key-operated operator panel designed for straightforward machine-level visualization and control tasks. This unit provides a text-based display interface and is part of Siemens' well-established SIMATIC HMI portfolio, offering reliable human-machine interaction for industrial environments.

The OP 77A features a 4-line STN LCD display capable of showing text and simple graphics, with a membrane keypad for operator input. It supports MPI and PROFIBUS DP communication interfaces, enabling direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and offers a compact, panel-mount design with an IP65 protection rating on the front face, making it suitable for installation in control cabinet doors.

The OP 77A is widely used in manufacturing, machine building, packaging, and process automation applications where a cost-effective, robust operator interface is required. Its compatibility with the SIMATIC S7 controller family makes it a practical choice for retrofitting or extending existing Siemens-based automation systems. The panel's compact footprint and simple keypad operation make it well suited for machines where space is limited and operator interaction is straightforward.

Technical Specifications

Display Type	STN LCD, monochrome
Display Size	4-line text display
Display Colors	Monochrome (blue/white backlight)
Input Method	Membrane keypad
Operating Voltage	24 V DC
Power Consumption	Max. 4 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, cULus
Configuration Software	WinCC flexible 2008 or higher
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400

Common Error Codes & System Events

Event ID: 10000: Configuration error — the loaded project is incompatible with the connected PLC or contains invalid configuration data.
Check the WinCC flexible project settings, verify PLC type and communication parameters, and reload the correct project to the panel.
Event ID: 20000: Communication error — the panel cannot establish or maintain a connection to the configured PLC.
Check MPI or PROFIBUS DP cabling and termination resistors, verify the PLC address settings, and confirm the PLC is powered and in RUN mode.
Event ID: 40000: System memory low — the panel's runtime memory is approaching its limit.
Reduce the number of active alarms or data logs, simplify the project, and reload the project to the panel.
Event ID: 50000: Tag read/write error — a configured tag cannot be read from or written to the connected PLC.
Verify the tag address in WinCC flexible matches the actual PLC data block or memory address. Check PLC program for address conflicts.
Event ID: 60000: Project download error — a project transfer to the panel was interrupted or failed.
Check the transfer cable connection, ensure the panel is in transfer mode, and retry the download. Verify sufficient free memory on the panel.
Event ID: 70000: Backlight failure warning — the LCD backlight is approaching end of life or has failed.
The panel may require backlight or display replacement. Contact a qualified repair technician for hardware servicing.
Event ID: 80000: Watchdog timeout — the panel runtime software has detected an internal processing timeout.
Perform a panel restart. If the fault persists, reload the project. If the issue continues, the panel may require service or replacement.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6641-5AC10-0KR0)?

The OP 77A is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP communication interfaces.

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

The OP 77A is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are transferred to the panel via the MPI interface or a dedicated transfer cable.

What is the supply voltage for the 6AV6641-5AC10-0KR0?

The panel operates on a 24 V DC supply voltage.

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

The front face of the OP 77A carries an IP65 protection rating, making it resistant to dust and water jets, suitable for installation in control cabinet doors.

Can the OP 77A display graphical images or only text?

The OP 77A is primarily a text-based operator panel with a 4-line monochrome LCD. It supports limited graphical elements but is not designed for full graphical HMI applications.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel's power connector. Verify the power supply is within the specified voltage range and delivering sufficient current.

Ensure the 24 V DC supply is stable and correctly wired. If the supply is confirmed good and the display remains blank, the internal power supply or backlight may have failed and the panel should be sent for repair.

Panel cannot communicate with the PLC

Check the MPI or PROFIBUS DP cable connections at both the panel and PLC. Verify bus termination resistors are correctly placed at both ends of the network. Confirm the PLC node address matches the address configured in the WinCC flexible project.

Replace or reseat the communication cable. Correct the bus termination. Adjust the PLC address in the project or on the PLC hardware to match. Reload the project to the panel after making changes.

Project transfer to the panel fails or is interrupted

Confirm the panel is set to transfer mode (accessible via the panel's start menu). Check the transfer cable or MPI adapter for faults. Verify the PC running WinCC flexible has the correct COM port or USB adapter settings.

Restart the panel in transfer mode and retry the download. Replace the transfer cable or MPI adapter if suspected faulty. Ensure no firewall or driver issues are blocking the transfer on the PC.

Operator keys are unresponsive or intermittently responsive

Inspect the membrane keypad surface for physical damage, contamination, or wear. Check if the issue is limited to specific keys or affects all keys.

Clean the keypad surface with a dry cloth. If specific keys are permanently unresponsive, the membrane keypad assembly may be worn or damaged and will require replacement by a qualified technician.

Panel displays repeated communication timeout alarms during operation

Monitor the MPI or PROFIBUS DP network for cable integrity issues, excessive bus load, or incorrect baud rate settings. Check if other devices on the same bus are experiencing communication issues.

Reduce bus load by checking the number of connected devices. Verify baud rate consistency across all bus participants. Replace damaged cables or connectors. Ensure proper shielding and grounding of the communication cable.

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