Siemens 6AV6355-1CA47-7EC0 OP 77B

€ 387,44

SKU: 6AV6355-1CA47-7EC0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7EC0 is an operator panel belonging to the OP 77B series, part of the SIMATIC HMI Basic Panels product family manufactured by Siemens. This compact panel operator interface is designed for machine-level visualization and control tasks, providing a straightforward human-machine interface for industrial automation systems. It is a key component in Siemens' SIMATIC HMI portfolio, intended for use with SIMATIC S7 PLCs and compatible controllers.

The OP 77B features a monochrome LCD display with a resolution of 160 x 80 pixels, capable of displaying text and simple graphics for process visualization. It supports communication via MPI and PROFIBUS DP interfaces, enabling direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and offers function keys for operator input, making it suitable for environments where a touch interface is not required. It 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 deployed in manufacturing, packaging, and process automation applications where a cost-effective, robust operator interface is needed at the machine level. Its compact form factor and panel-mount design make it suitable for integration into control cabinets and machine enclosures. Industries such as automotive, food and beverage, and general machinery manufacturing commonly use this panel for local operator control and status monitoring.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Input/Operating Voltage	24 V DC
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
Configuration Software	WinCC flexible 2008
Series/Product Family	SIMATIC HMI OP 77B
Certifications	CE, UL, cULus

Common Error Codes and 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 or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings and baud rate configuration in WinCC flexible match the controller settings.
Event ID: 10001: Connection to the PLC was established but subsequently lost during operation.
Inspect cabling for intermittent faults. Check for electromagnetic interference sources near the communication cable. Verify PLC is in RUN mode and not in STOP or fault state.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel successfully.
Ensure the correct communication interface is selected in WinCC flexible. Verify the PC-to-panel transfer cable is functioning and the panel is in transfer mode.
Event ID: 40000: System memory low. The panel's available memory for runtime operation is insufficient.
Reduce the size of the loaded project by removing unused screens or tags. Restart the panel to clear temporary memory allocations.
Event ID: 50000: Illegal system state detected. The panel runtime has encountered an unexpected internal error.
Perform a panel restart. If the error persists, reload the project configuration via WinCC flexible and consider a factory reset.
Event ID: 70000: Tag update error. A configured process tag could not be read from or written to the connected controller.
Verify the tag address configured in WinCC flexible matches the actual PLC data block or memory address. Check PLC program for address conflicts.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B (6AV6355-1CA47-7EC0)?

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 S7-200 via PPI protocol.

What software is used to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible 2008 software. Projects are transferred to the panel via the MPI interface or a dedicated PC-to-panel transfer cable.

What is the supply voltage for the 6AV6355-1CA47-7EC0?

The panel operates on a 24 V DC supply voltage. Ensure the power supply is within the specified tolerance range to avoid operational issues.

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 touch input?

No, the OP 77B does not feature a touchscreen. Operator input is performed via dedicated function keys and navigation keys located on the panel face.

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 the acceptable voltage tolerance range. Inspect the connector for secure seating.

Restore the 24 V DC supply to the correct level. If the supply is correct and the display remains blank, the internal power supply or display backlight may have failed and the unit should be sent for repair or replacement.

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

Check the MPI or PROFIBUS DP cable between the panel and the PLC. Verify bus termination is correctly applied at both ends of the network. Confirm the PLC address and baud rate in the project match the physical PLC configuration.

Replace or reseat the communication cable. Correct any address or baud rate mismatches in the WinCC flexible project and re-download the configuration. Ensure the PLC is powered and in RUN mode.

Project transfer from PC to panel fails

Confirm the panel is set to transfer mode by navigating to the panel's loader menu. Verify the correct communication port and transfer settings are selected in WinCC flexible on the PC side.

Set the panel to transfer mode before initiating the download. Use a known-good MPI cable and ensure the PC's communication adapter (e.g., PC Adapter USB) is correctly installed and configured.

Function keys do not respond to operator input

Check for physical damage or contamination on the keypad surface. Attempt a panel restart to rule out a software lockup. Verify the project configuration has correctly assigned actions to the function keys.

Clean the keypad surface and restart the panel. If keys remain unresponsive after restart and project verification, the keypad membrane or internal electronics may be faulty and the unit requires hardware repair.

Panel repeatedly restarts or enters a boot loop

Check the supply voltage for instability or voltage drops under load. Inspect the loaded project for configuration errors that may cause a runtime crash on startup.

Stabilize the 24 V DC power supply. Reload the project using WinCC flexible. If the issue persists with a valid project, perform a factory reset via the panel's loader menu and re-download the configuration.

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