Siemens 6AV6355-1FA00-0EQ4 OP 77B

€ 152,34

SKU: 6AV6355-1FA00-0EQ4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1FA00-0EQ4 is an OP 77B operator panel belonging to the SIMATIC HMI Basic Panels product family. It is a compact, key-operated operator panel designed for straightforward machine-level human-machine interface tasks. This unit provides a monochrome display with a membrane keypad for operator input, making it suitable for applications requiring reliable and cost-effective HMI solutions.

The OP 77B features a 4-line STN LCD display with a resolution of 160 x 32 pixels and a backlit monochrome screen for clear readability in various lighting conditions. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration with Siemens SIMATIC S7 PLCs. Configuration is performed using Siemens WinCC flexible software, and the panel supports a range of function keys for direct operator control. The unit operates on a 24 V DC supply and is rated to IP65 on the front face for protection against dust and water ingress.

The OP 77B is widely used in manufacturing, packaging, and process automation environments where a simple, robust operator interface is required at the machine level. Its compact form factor and keypad-based operation make it well suited for control cabinets and machine panels where touchscreen interfaces are not necessary. Industries such as automotive, food and beverage, and general machine building commonly deploy this panel for parameter setting, status monitoring, and alarm display.

Technical Specifications

Display Type	STN LCD, monochrome
Display Size	4-line text display
Display Resolution	160 x 32 pixels
Input/Operating Voltage	24 V DC
Power Consumption	4.5 W (typical)
Communication Interface	MPI, PROFIBUS DP
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
Configuration Software	WinCC flexible 2005 or higher
Series/Product Family	SIMATIC HMI Basic Panels / OP 77B

Common Error Codes and System Events

Event ID: 10000: Configuration error — the project loaded onto the panel is incompatible or corrupted.
Reload the correct WinCC flexible project to the panel using a PC connection. Verify the project was compiled without errors before transfer.
Event ID: 10001: Communication error — the panel cannot establish a connection to the configured PLC.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration.
Event ID: 20000: System memory low — available memory on the panel is insufficient to run the current project.
Reduce the project size by removing unused screens or tags. Transfer the optimized project back to the panel.
Event ID: 40000: Tag read error — the panel cannot read a configured tag from the PLC.
Verify the tag address in WinCC flexible matches the actual PLC data block or memory address. Check PLC program is running and the address exists.
Event ID: 40001: Tag write error — the panel cannot write a value to the configured PLC tag.
Check that the PLC tag address is writable and not write-protected. Verify communication link integrity and PLC operating mode.
Event ID: 50000: Backlight failure warning — the display backlight is approaching end of life or has failed.
Replace the panel or arrange for backlight servicing. Continued operation may result in reduced display visibility.
Event ID: 60000: Operating system error — an internal firmware or OS fault has occurred.
Perform a panel reset by cycling power. If the fault persists, reload the panel firmware using ProSave or WinCC flexible transfer tools.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B panel?

The OP 77B is designed primarily for use with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with S7-1200 in some configurations depending on firmware version.

What software is required to configure the 6AV6355-1FA00-0EQ4?

The panel is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are transferred to the panel via MPI, PROFIBUS DP, or a direct PC/PPI cable connection.

What is the supply voltage for this operator panel?

The OP 77B operates on a 24 V DC supply voltage. Ensure the power supply is within the specified tolerance range to avoid damage or malfunction.

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

The front face of the OP 77B is rated to IP65, providing protection against dust ingress and low-pressure water jets. The rear of the unit is rated IP20.

Does the OP 77B support alarm and event logging?

Yes, the OP 77B supports alarm display and acknowledgment functions. However, due to its basic panel classification, data logging and recipe management capabilities are limited compared to higher-tier SIMATIC HMI panels.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel power connector. Check that the supply is within tolerance and that the connector is fully seated. Inspect the internal fuse if accessible.

Correct any supply voltage issues or replace the power supply unit. If voltage is correct and display remains blank, the backlight or internal power board may have failed and the panel should be repaired or replaced.

Panel displays 'No connection to PLC' or communication error on startup

Check the MPI or PROFIBUS DP cable for physical damage and verify that termination resistors are correctly installed at both ends of the bus. Confirm the PLC address and baud rate configured in WinCC flexible match the actual PLC settings.

Replace or reseat the communication cable. Correct the bus address and baud rate in the WinCC flexible project and retransfer to the panel. Ensure the PLC is in RUN mode.

Panel repeatedly reboots or freezes during operation

Check for unstable 24 V DC supply voltage, particularly voltage dips caused by other loads on the same supply rail. Inspect the panel for signs of overheating or excessive ambient temperature.

Stabilize the power supply by using a dedicated 24 V DC rail for the panel. Ensure ambient temperature is within the 0 °C to +50 °C operating range. If reboots persist, reload the panel firmware using ProSave.

Function keys do not respond or respond incorrectly

Inspect the membrane keypad for physical damage, contamination, or deformation. Verify in the WinCC flexible project that the function keys are correctly assigned to the intended actions.

Clean the keypad surface if contaminated. If keys are physically damaged, the front panel membrane assembly requires replacement. Correct any incorrect key assignments in the project and retransfer.

Project transfer to panel fails or times out

Verify the communication cable between the PC and the panel is correctly connected and the correct transfer channel (MPI, PROFIBUS DP, or USB-to-PPI adapter) is selected in WinCC flexible. Check that the panel is in transfer mode.

Place the panel in transfer mode manually via the panel's start center menu. Ensure the correct COM port or adapter driver is installed on the PC. Retry the transfer at a lower baud rate if timeouts occur.

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