Siemens 6AV6355-1CA47-7CK2 OP 77B

€ 1.058,71

SKU: 6AV6355-1CA47-7CK2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7CK2 is an operator panel belonging to the OP 77B series within the SIMATIC HMI product family. This compact panel is designed for machine-level human-machine interface applications, providing operators with a straightforward means of monitoring and controlling industrial processes. It is a key component in Siemens' range of basic HMI panels, offering reliable operation in demanding industrial environments.

The OP 77B features a monochrome STN LCD display and supports communication via MPI, PROFIBUS DP, and RS-422/RS-485 interfaces, enabling integration with SIMATIC S7 PLCs and other compatible controllers. The panel is configured using WinCC flexible software, allowing engineers to create and transfer projects efficiently. It includes function keys and a numeric keypad for operator input, and is rated IP65 on the front face, providing protection against dust and water ingress. The unit operates on a 24 V DC supply and is built to withstand typical industrial ambient conditions.

The OP 77B panel is widely used in manufacturing, packaging, and process automation applications where a cost-effective, robust HMI solution is required at the machine level. It is particularly suited for integration with SIMATIC S7-200, S7-300, and S7-400 PLC systems, as well as third-party controllers via its serial interfaces. Its compact form factor and panel-mount design make it appropriate for installation in control cabinets and machine enclosures across a broad range of industries.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
Power Consumption	Max. 6 W
Communication Interface	MPI, PROFIBUS DP, RS-422/RS-485
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 mount
Configuration Software	WinCC flexible 2005 or higher
Certifications	CE, UL, cULus
Series/Product Family	SIMATIC HMI OP 77B

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 interrupted or cannot be established.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the HMI project configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to PLC timeout. The HMI panel did not receive a response from the controller within the expected time frame.
Check network cabling and connectors. Verify PLC is operational and communication parameters (baud rate, station address) are correctly configured in the HMI project.
Event ID: 20000: Project download error. A fault occurred during the transfer of the HMI project from the engineering PC to the panel.
Check the transfer cable connection. Ensure the panel is in transfer mode and that the correct COM port and transfer settings are selected in WinCC flexible. Retry the download.
Event ID: 40000: Internal device error. A hardware or firmware fault has been detected within the HMI panel.
Perform a power cycle. If the fault persists, perform a factory reset via the panel's loader menu. If the issue continues, the unit may require repair or replacement.
Event ID: 50000: Configuration error. The loaded project contains settings or objects that are incompatible with this panel type or firmware version.
Verify the project was compiled for the OP 77B panel type in WinCC flexible. Check firmware version compatibility and update if necessary before re-downloading the project.
Event ID: 60000: Memory error. Insufficient memory available on the panel to load or run the current project.
Reduce the size of the HMI project by removing unused tags, screens, or graphics. Recompile and re-download the project to the panel.
Event ID: 70000: Firmware update error. An error occurred during a firmware update procedure on the panel.
Ensure a stable power supply during firmware updates. Re-attempt the firmware update using the correct firmware file for the OP 77B. Do not interrupt power during the update process.

Frequently Asked Questions

Which PLCs are compatible with the Siemens 6AV6355-1CA47-7CK2 OP 77B?

The OP 77B is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It also supports communication with third-party controllers via RS-422/RS-485 serial interfaces.

What software is required to configure and program the OP 77B panel?

The OP 77B is configured using Siemens WinCC flexible 2005 or a later version. Projects are created on a PC and transferred to the panel via a serial or USB-to-serial connection.

What is the supply voltage for the 6AV6355-1CA47-7CK2?

The panel requires a 24 V DC power supply. Ensure the supply is within the specified tolerance range to guarantee reliable operation.

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

The front face of the OP 77B 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 77B panel be used with PROFIBUS DP networks?

Yes, the OP 77B supports PROFIBUS DP communication, allowing it to be integrated into existing PROFIBUS networks alongside SIMATIC PLCs and other PROFIBUS-compatible devices.

Troubleshooting

Display remains blank after power on

Check that 24 V DC is present at the power supply terminals of the panel using a multimeter. Inspect the supply cable and connector for damage or loose connections.

Restore the correct 24 V DC supply. If voltage is present but the display remains blank, the internal power supply or backlight may have failed, requiring unit repair or replacement.

HMI panel shows 'No connection to PLC' or communication error on screen

Verify the MPI or PROFIBUS DP cable is securely connected at both the panel and PLC ends. Check that bus termination resistors are correctly installed at both ends of the network segment.

Correct any wiring faults and ensure termination is applied. Confirm that the PLC station address and baud rate in the HMI project match the actual PLC configuration. Restart both the PLC and HMI panel.

Project cannot be downloaded to the panel from WinCC flexible

Confirm the panel is set to transfer mode via the loader menu. Check the serial cable connection between the PC and the panel, and verify the correct COM port is selected in WinCC flexible transfer settings.

Set the panel to transfer mode, use a known-good transfer cable, and select the correct COM port and baud rate in WinCC flexible. Retry the project download.

Panel keys or function keys are unresponsive

Check for physical damage to the keypad membrane. Attempt a power cycle to rule out a temporary firmware lockup. Verify the project configuration assigns actions to the relevant keys.

If a power cycle does not resolve the issue, perform a factory reset via the loader menu and re-download the project. If keys remain unresponsive after reset, the keypad membrane may require replacement.

Panel repeatedly restarts or enters a boot loop

This may indicate a corrupted project file or a firmware issue. Observe whether the panel reaches the loader menu before restarting, which would suggest a project-level fault rather than a hardware failure.

Access the loader menu during startup and delete the existing project, then re-download a freshly compiled project from WinCC flexible. If the boot loop persists without a project loaded, a firmware re-flash or hardware repair may be required.

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