Siemens 6AV6355-1CA47-7CD0 OP 77B

€ 371,48

SKU: 6AV6355-1CA47-7CD0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7CD0 is an operator panel belonging to the OP 77B series within the Siemens SIMATIC HMI product family. This compact panel operator unit is designed for machine-level human-machine interface applications, providing a keypad-based interface for process monitoring and control. It is part of the SIMATIC HMI Basic Panels generation and is manufactured by Siemens AG as a robust front-panel-mount device.

The OP 77B features a monochrome STN LCD display and a membrane keypad with function keys, system keys, and numeric entry capability. It supports MPI and PROFIBUS DP communication interfaces for integration with Siemens S7-200, S7-300, and S7-400 PLCs, as well as other compatible controllers. The unit operates on a 24 V DC supply and is configured using Siemens WinCC flexible software. It offers a degree of protection of IP65 on the front panel, making it suitable for industrial environments.

The OP 77B is widely deployed in manufacturing, machine building, and process automation applications where a cost-effective, reliable operator interface is required. It is commonly found on packaging machines, conveyor systems, and general-purpose industrial machinery where operators need to input parameters, monitor process values, and acknowledge alarms. Its compact form factor and keypad-based operation make it well-suited for environments where touchscreen panels are not practical.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
Permissible Voltage Range	19.2 – 28.8 V DC
Power Consumption	Approx. 4 W
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 or higher
Certifications	CE, UL, cULus

Common Error Codes and System Events

Event ID: 10000: Configuration error detected; the loaded project is incompatible with the panel firmware version.
Reload the correct project version using WinCC flexible. Ensure firmware and project version compatibility.
Event ID: 10001: Communication connection to the PLC has been interrupted or cannot be established.
Check MPI/PROFIBUS DP cable connections, verify PLC address settings, and confirm baud rate configuration matches the controller.
Event ID: 20000: System memory low; available memory for runtime operation is insufficient.
Reduce the project size, remove unused screens or variables, and reload the optimized project to the panel.
Event ID: 40000: Tag read error; the panel cannot read a configured variable from the connected controller.
Verify the PLC address, data block number, and variable offset in the WinCC flexible project. Confirm the PLC program is running.
Event ID: 40001: Tag write error; a write operation to a PLC variable has failed.
Check write permissions for the target variable in the PLC program. Verify communication link integrity and PLC operating mode.
Event ID: 50000: Alarm buffer overflow; the number of pending alarms has exceeded the buffer capacity.
Acknowledge and clear active alarms. Review the alarm configuration to reduce simultaneous alarm occurrences.
Event ID: 70000: Firmware update error; the firmware transfer to the panel was interrupted or failed.
Restart the firmware update procedure using ProSave or WinCC flexible. Ensure stable power supply during the update process.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B?

The OP 77B supports communication with Siemens S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It is also compatible with certain third-party controllers that support these protocols.

What software is used to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are transferred to the panel via MPI, PROFIBUS DP, or a serial PC/PPI cable.

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.

Does the OP 77B support touchscreen input?

No, the OP 77B is a keypad-based operator panel and does not feature a touchscreen. User input is performed via membrane function keys, system keys, and a numeric keypad.

What is the supply voltage for the 6AV6355-1CA47-7CD0?

The unit requires a 24 V DC supply with a permissible operating range of 19.2 V DC to 28.8 V DC.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the power connector. Verify the voltage is within the 19.2–28.8 V DC permissible range. Check for blown internal fuse.

Correct the supply voltage if out of range. Replace the internal fuse if blown. If the display backlight has failed, the panel may require backlight or display module replacement.

Panel displays 'No connection to PLC' or communication error message

Check the MPI or PROFIBUS DP cable for physical damage and secure connections at both the panel and PLC ends. Verify the PLC address and baud rate settings in the WinCC flexible project match the PLC configuration.

Replace damaged cables, correct address and baud rate settings in the project, reload the project to the panel, and confirm the PLC is in RUN mode.

Panel does not accept project download from engineering PC

Verify the communication cable type and connection method (MPI adapter, PC/PPI cable). Check that the correct COM port and transfer settings are selected in WinCC flexible.

Use a compatible MPI adapter (e.g., PC Adapter USB) and ensure the correct interface is selected in WinCC flexible Transfer settings. Set the panel to Transfer mode before initiating the download.

Function keys do not respond or produce incorrect actions

Check the project configuration in WinCC flexible to verify correct key assignments. Inspect the membrane keypad for physical damage or contamination beneath the keys.

Reload the correct project to the panel. If the membrane keypad is physically damaged, replace the keypad assembly or the complete panel front unit.

Panel resets or reboots unexpectedly during operation

Monitor the supply voltage for dips or instability under load. Check for excessive ambient temperature at the installation location. Review the system event log on the panel for recorded fault events.

Stabilize the 24 V DC power supply, ensure adequate ventilation around the panel, and address any logged system events. If reboots persist, perform a factory reset and reload the project.

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