Siemens 6AV6355-1CA47-7BD2 OP 77B

€ 607,64

SKU: 6AV6355-1CA47-7BD2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7BD2 is an operator panel belonging to the OP 77B series within Siemens' SIMATIC HMI product line. This compact panel operator unit is designed for machine-level human-machine interface applications, providing operators with a straightforward interface for monitoring and controlling automated processes. The OP 77B series is part of the broader SIMATIC HMI Basic Panels family, manufactured by Siemens AG.

The OP 77B features a monochrome LCD display with a resolution of 160 x 80 pixels and a membrane keypad for operator input, eliminating the need for a touchscreen while maintaining reliable operation in industrial environments. It supports MPI and PROFIBUS DP communication interfaces, enabling direct integration with Siemens S7-200, S7-300, and S7-400 PLCs. The panel is configured using Siemens WinCC flexible software and operates on a 24 V DC supply voltage, with an IP65 protection rating on the front face for resistance to dust and water ingress.

The OP 77B is commonly deployed in manufacturing, packaging, and process automation environments where a cost-effective, 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 with limited space. Industries such as food and beverage, automotive assembly, and general factory automation regularly utilize this panel for local operator interaction with PLC-controlled machinery.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Input Voltage	24 V DC
Voltage Tolerance	19.2 V DC to 28.8 V DC
Power Consumption	Approx. 3 W
Communication Interface	MPI / PROFIBUS DP
IP Protection Rating (Front)	IP65
IP Protection 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 2005 or higher
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC. The panel cannot establish or maintain a connection to the controller.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect the communication cable for damage or loose connectors. Check the MPI/PROFIBUS network for address conflicts. Restart the panel and PLC to re-establish communication.
Event ID: 20000: Configuration or project download error. The project data on the panel is missing or corrupted.
Re-download the WinCC flexible project to the panel using a PC connection cable. Verify the project was compiled without errors before transfer.
Event ID: 40000: System memory error. The panel has detected an issue with its internal memory or configuration storage.
Perform a factory reset of the panel and re-download the project. If the error persists, the panel may require servicing or replacement of internal components.
Event ID: 50000: Tag or variable update error. A configured tag cannot be read from or written to the PLC.
Verify the PLC data block addresses referenced in the WinCC flexible project are correct and accessible. Check that the PLC program contains the expected data areas.
Event ID: 60000: Operating system or firmware error detected on the panel.
Perform a panel restart. If the fault recurs, update the panel firmware using the Siemens ProSave tool or contact Siemens technical support.
Event ID: 70000: Power supply undervoltage detected. The supply voltage has dropped below the minimum operating threshold.
Measure the 24 V DC supply at the panel power connector. Ensure the supply is within the 19.2 V to 28.8 V DC range and that the power source has sufficient current capacity.

Frequently Asked Questions

Which PLCs are compatible with the Siemens OP 77B (6AV6355-1CA47-7BD2)?

The OP 77B is compatible with Siemens S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP communication interfaces. It can also communicate with certain third-party controllers depending on the protocol configuration.

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

The OP 77B is configured using Siemens WinCC flexible 2005 or a later version. Projects are compiled and downloaded to the panel via a PC adapter cable connected to the MPI interface.

What is the input voltage requirement for the 6AV6355-1CA47-7BD2?

The panel requires a 24 V DC supply voltage with an acceptable range of 19.2 V DC to 28.8 V DC. An external 24 V DC power supply must be provided.

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 front panel protection rating of the OP 77B?

The front panel of the OP 77B carries an IP65 protection rating, making it resistant to dust ingress and low-pressure water jets. The rear of the unit is rated IP20.

Troubleshooting

Display remains blank after power is applied

Check the 24 V DC supply voltage at the panel power connector using a multimeter. Verify the supply is within the 19.2 V to 28.8 V DC range and that polarity is correct.

Correct any wiring errors or replace the external power supply if the voltage is out of range. If voltage is correct and the display remains blank, the internal power supply or display backlight may be faulty and the unit should be inspected for repair.

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

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

Correct any loose connections or replace a damaged cable. Ensure the PLC station address and baud rate configured in WinCC flexible match the actual PLC settings. Confirm the PLC is powered on and in RUN mode.

Project download from PC to panel fails or times out

Check the PC adapter cable connection to the panel MPI port. Verify the correct COM port and transfer rate are selected in WinCC flexible or ProSave. Ensure no other devices are actively communicating on the MPI bus during the transfer.

Retry the download with other MPI network devices disconnected. If using a USB-to-MPI adapter, ensure the correct driver version is installed. Recompile the WinCC flexible project and attempt the transfer again.

Operator keys on the membrane keypad are unresponsive or intermittent

Inspect the keypad surface for physical damage, contamination, or deformation. Test each key systematically using a diagnostic screen or key test function if available in the panel's start center.

Clean the keypad surface with a dry cloth. If individual keys are permanently unresponsive due to membrane damage, the keypad membrane or the complete front panel assembly will need to be replaced.

Panel repeatedly restarts or enters a boot loop

Check the supply voltage stability under load. Inspect the panel for signs of overheating, such as high ambient temperature or blocked ventilation around the unit.

Ensure the ambient operating temperature does not exceed 50 °C and that the panel is mounted with adequate clearance. If the supply voltage is stable and temperature is within range, perform a factory reset using the panel's start center and re-download the project. Persistent boot loops may indicate internal hardware failure requiring unit repair or replacement.

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