Siemens 6AV6355-1CA47-7EK1 OP 77B

€ 418,29

SKU: 6AV6355-1CA47-7EK1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7EK1 is an OP 77B operator panel belonging to the SIMATIC HMI Basic Panels product family. It is designed for straightforward machine-level operator control and monitoring tasks, providing a compact and cost-effective human-machine interface solution. This unit is part of Siemens' established SIMATIC HMI portfolio and is configured and programmed using WinCC flexible software.

The OP 77B features a monochrome STN LCD display with a resolution of 160 x 80 pixels and a membrane keypad for operator input, eliminating the need for a touchscreen. It supports MPI and PROFIBUS DP communication interfaces, enabling direct integration with SIMATIC S7 PLCs. The panel includes onboard flash memory for project storage and operates on a 24 V DC supply, with an operating temperature range suitable for standard industrial cabinet installations.

The OP 77B is widely deployed in manufacturing, packaging, and process automation environments where a simple, reliable operator interface is required at the machine level. Its compact form factor and keypad-based operation make it suitable for applications where touchscreen panels are unnecessary or impractical, such as control cabinets with limited space or environments with high vibration. The panel is commonly used alongside SIMATIC S7-200, S7-300, and S7-400 PLCs in discrete and continuous production systems.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Size	4 inches (diagonal)
Input Method	Membrane keypad
Operating Voltage	24 V DC
Power Consumption	Max. 4.8 W
Communication Interface	MPI, PROFIBUS DP
Memory	512 KB flash (user memory)
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
IP Rating (Front)	IP65
IP Rating (Rear)	IP20
Mounting	Panel mounting
Certifications	CE, UL, cULus
Configuration Software	WinCC flexible 2008

Common Error Codes and System Events

Event ID: 1003: Communication error between the HMI panel and the connected PLC. The panel cannot establish or maintain a connection to the controller.
Check MPI or 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: 1004: Connection to PLC interrupted during runtime. The panel lost communication with the configured controller.
Inspect cable integrity and connector seating. Check for address conflicts on the MPI or PROFIBUS network. Restart both the HMI panel and PLC if the connection does not recover automatically.
Event ID: 10000: Project download error. The project could not be transferred to the panel successfully.
Verify the PC-to-panel communication cable is correctly connected. Ensure WinCC flexible is configured with the correct transfer settings and that the panel is in transfer mode.
Event ID: 10001: Insufficient memory for project. The project file exceeds the available flash memory on the panel.
Reduce the project size by removing unused screens, tags, or graphics. Recompile and re-download the project after optimization.
Event ID: 20000: System startup error. The panel encountered a fault during the boot sequence.
Perform a factory reset by holding the appropriate key combination during power-on. If the fault persists, the internal flash memory or firmware may be corrupted and the unit may require servicing.
Event ID: 40000: Operating system error or firmware mismatch detected on the panel.
Update the panel firmware to the version compatible with the WinCC flexible project. Use the Siemens ProSave tool to restore or update the operating system image.
Event ID: 1740: Tag update cycle time exceeded. The HMI is unable to read or write tags within the configured cycle time.
Increase the tag acquisition cycle time in the WinCC flexible project. Reduce the number of tags polled simultaneously or optimize the communication load on the MPI/PROFIBUS network.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B panel?

The OP 77B is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with certain third-party controllers supported by WinCC flexible drivers.

What software is required to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible 2008 or later compatible versions. Projects are downloaded to the panel via an MPI cable or PROFIBUS connection from a PC.

Does the OP 77B have a touchscreen?

No, the OP 77B uses a membrane keypad for operator input and does not feature a touchscreen. Navigation and data entry are performed using the function and system keys on the keypad.

What is the supply voltage for the OP 77B?

The OP 77B operates on a 24 V DC supply voltage. Ensure the power supply is within the specified tolerance range to prevent operational faults.

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

The front panel of the OP 77B carries an IP65 protection rating, making it suitable for installation in environments where dust and water jets may be present.

Troubleshooting

Display remains blank after power on

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

Restore correct 24 V DC supply. If voltage is confirmed correct and the display remains blank, the internal power supply board or display backlight may have failed and the unit should be inspected for component-level repair or replacement.

Panel fails to communicate with the S7 PLC

Verify the MPI or PROFIBUS DP cable is correctly wired and terminated. Check that the bus address configured in the HMI project matches the physical address set on the PLC and that baud rates are consistent across all network nodes.

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. Ensure bus termination resistors are enabled only at the two physical ends of the network.

Project download fails from WinCC flexible

Confirm the panel is in transfer mode before initiating the download. Check the PC-to-panel cable type and that the correct communication port and settings are selected in WinCC flexible transfer options.

Switch the panel to transfer mode via the start center menu. Use a known-good MPI programming cable. If the download still fails, perform a panel reset using ProSave and retry the transfer.

Operator keys are unresponsive or erratic

Inspect the membrane keypad surface for physical damage, contamination, or deformation. Check whether the issue is limited to specific keys or affects the entire keypad.

Clean the keypad surface with a dry cloth. If individual keys are physically damaged or the keypad connector is loose internally, the keypad membrane assembly should be replaced. For persistent issues, the unit may require workshop-level repair.

Panel repeatedly reboots or freezes during operation

Check the 24 V DC supply for voltage dips or ripple that may cause instability. Review the event log on the panel for system event codes that indicate the cause of the restart.

Ensure the power supply is adequately rated and free from interference. If supply quality is confirmed good, the internal flash memory may be corrupted; use ProSave to reload the operating system and re-download the project.

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