Siemens 6AV6355-1AA47-7CK4 OP 77A

€ 2.995,00

SKU: 6AV6355-1AA47-7CK4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CK4 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 controller families.

The OP 77A features a monochrome LCD display with a resolution of 160 x 80 pixels and supports function keys for direct operator input without a touchscreen. It communicates via MPI and PROFIBUS DP interfaces, enabling seamless integration into existing Siemens automation networks. The unit operates on a 24 V DC supply and is built to withstand the demands of industrial environments, carrying a front panel protection rating of IP65. Configuration is performed using Siemens WinCC flexible or STEP 7 Micro/WIN software.

The OP 77A is commonly deployed on standalone machines and production lines in manufacturing, packaging, food and beverage, and general industrial automation sectors. Its compact form factor and keypad-based operation make it suitable for applications where a simple, reliable operator interface is required without the complexity of a full graphical touchscreen panel. The panel is particularly well-suited for retrofitting older installations or integrating into space-constrained control cabinets.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Input/Operating Voltage	24 V DC
Communication Interface	MPI, PROFIBUS DP
IP/Protection Rating	IP65 (front panel)
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
Mounting	Panel mounting
Series/Product Family	SIMATIC HMI OP 77A
Control Type	Function keys (keypad)
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC or controller.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify the configured station address matches the physical device address. Restart both the panel and the controller.
Event ID: 10001: Connection to the configured PLC has been interrupted or lost during operation.
Inspect the communication cable for damage or loose connectors. Confirm the PLC is powered and running. Re-establish the connection and check the network configuration in WinCC flexible.
Event ID: 20000: Project download error — the configuration project could not be transferred to the panel.
Verify the transfer cable and PC interface settings. Ensure the panel is in transfer mode before initiating download. Check that the WinCC flexible project is compiled without errors.
Event ID: 40000: System memory low — available memory on the panel is insufficient to load the project.
Reduce the size of the HMI project by removing unused screens, tags, or graphics. Reload the optimized project to the panel.
Event ID: 50000: Internal device error or hardware fault detected on the panel.
Perform a factory reset of the panel. If the fault persists after reset and reloading the project, the panel hardware may require repair or replacement.
Event ID: 60000: Tag or variable update failure — a configured tag could not be read from or written to the PLC.
Verify the tag address in the WinCC flexible project matches the actual PLC data block or memory address. Check PLC program for address conflicts.
Event ID: 70000: Panel startup error — the operating system or project could not be loaded correctly at power-on.
Cycle power to the panel. If the error persists, re-transfer the project using WinCC flexible. A firmware update may be required if the issue is software-related.

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 S7-200, S7-300, and S7-400 PLCs as well as other PROFIBUS-compatible controllers.

What software is used to configure the Siemens 6AV6355-1AA47-7CK4?

The panel is configured using Siemens WinCC flexible or, for S7-200 applications, STEP 7 Micro/WIN with the appropriate HMI configuration tool. The project is then downloaded to the panel via a PC adapter cable.

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

The OP 77A has an IP65 protection rating on the front panel, making it resistant to dust ingress and low-pressure water jets, suitable for most industrial machine environments.

Does the OP 77A have a touchscreen?

No, the OP 77A does not have a touchscreen. Operator input is performed via dedicated function keys and navigation keys on the keypad.

What is the operating voltage for the 6AV6355-1AA47-7CK4?

The panel operates on a 24 V DC supply voltage, which is standard for SIMATIC HMI operator panels in this series.

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 to confirm supply integrity. Inspect internal fuse if accessible.

Restore correct 24 V DC supply. Replace any blown fuse with the correct rating. If the display remains blank with confirmed supply voltage, the internal power supply or display unit may require replacement.

Panel fails to communicate with the PLC

Verify the MPI or PROFIBUS DP cable is correctly connected and terminated at both ends. Check that the station address configured in the HMI project matches the physical address set on the panel. Confirm the PLC is in RUN mode.

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

Project download fails or transfer is interrupted

Confirm the panel is set to transfer mode before initiating the download from the PC. Check the PC adapter cable and the selected communication port in WinCC flexible transfer settings.

Set the panel to transfer mode via the Start Center menu. Select the correct COM port or USB adapter in the transfer settings. Re-initiate the download. If errors persist, check for project compilation errors in WinCC flexible.

Function keys do not respond or produce incorrect actions

Check the key assignment configuration in the WinCC flexible project. Verify that the correct screen is active and that the function key assignments are not overridden by a global key configuration.

Review and correct the function key assignments in the HMI project. Re-download the updated project to the panel. If keys are physically unresponsive, the keypad membrane may be worn and require hardware replacement.

Panel repeatedly restarts or shows startup errors

Attempt to reload the HMI project from the PC. Check if the panel firmware version is compatible with the WinCC flexible project version. Inspect the power supply for voltage fluctuations.

Re-transfer the project using WinCC flexible. Update the panel firmware if a version mismatch is identified. Ensure the 24 V DC supply is stable and within specification. If the issue persists, the panel may require repair or replacement.

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