Siemens 6AV6355-1CA47-7HC2 OP 77B

€ 1.995,00

SKU: 6AV6355-1CA47-7HC2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7HC2 is an operator panel belonging to the OP 77B series within the Siemens SIMATIC HMI product family. It is a compact, key-operated panel designed for machine-level human-machine interface applications, providing operators with a straightforward means of monitoring and controlling automated processes. This unit is part of the broader SIMATIC HMI Basic Panels generation and is manufactured by Siemens AG.

The OP 77B features a monochrome STN LCD display with a resolution of 160 x 80 pixels, capable of displaying text and simple graphics for process visualization. It supports communication via PROFIBUS DP and MPI interfaces, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs without an additional communication module. The panel includes a membrane keypad with function keys, system keys, and numeric entry keys, and is configured using Siemens WinCC flexible software. It operates on a 24 V DC supply and carries a protection rating of IP65 on the front face.

The OP 77B is widely used 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 panel-mount design make it suitable for integration into control cabinets and machine panels with limited space. Industries such as food and beverage, automotive assembly, and general factory automation commonly deploy this panel for local operator interaction with SIMATIC-based control systems.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
Communication Interface	PROFIBUS DP, MPI
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
Series	SIMATIC HMI OP 77B

Common Error Codes and 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 configured controller.
Check PROFIBUS DP or MPI cable connections and termination resistors. Verify the configured PLC address matches the physical device address. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during runtime operation.
Inspect communication cables for damage or loose connectors. Check for address conflicts on the PROFIBUS or MPI network. Restart the panel and PLC if the connection does not recover automatically.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel successfully.
Verify the USB or serial transfer cable is correctly connected. Ensure WinCC flexible project settings match the target panel type and firmware version. Retry the download after restarting the panel in transfer mode.
Event ID: 40000: System memory low. The panel is reporting insufficient memory resources to continue normal operation.
Reduce the number of active alarms or data records stored on the device. Review the project configuration for unnecessary data logs or recipe records and remove them before reloading the project.
Event ID: 50000: Firmware version mismatch. The loaded project was created for a different firmware version than currently installed on the panel.
Update the panel firmware to the version required by the project using ProSave or WinCC flexible. Alternatively, recompile and download the project using the WinCC flexible version matching the installed firmware.
Event ID: 70000: Tag read/write error. A configured tag could not be read from or written to the PLC within the defined timeout period.
Verify the tag address in the WinCC flexible project matches the actual PLC memory address. Check PLC program to ensure the data block or memory area is accessible and not write-protected.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B panel?

The OP 77B supports direct communication with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with S7-1200 and certain third-party controllers depending on the configured driver in WinCC flexible.

What software is used to configure the Siemens 6AV6355-1CA47-7HC2?

The panel is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are transferred to the panel via a PC adapter cable connected to the MPI/PROFIBUS port or via USB transfer cable.

What is the supply voltage for this operator panel?

The OP 77B operates on a 24 V DC supply voltage. The power connection is made via the rear connector of the panel.

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

The front face 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.

Can the OP 77B display graphical images or only text?

The OP 77B can display simple graphics and symbols in addition to text on its monochrome LCD, but it is primarily designed for text-based process visualization due to its limited 160 x 80 pixel resolution.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the rear power connector. Check that polarity is correct and voltage is within the acceptable range. Inspect the internal fuse if accessible.

Correct any wiring errors or supply voltage issues. If the supply voltage is confirmed 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 shows communication error and cannot connect to PLC

Check the MPI or PROFIBUS DP cable for continuity and correct termination at both ends of the network. Verify the panel's configured PLC address in the WinCC flexible project matches the physical PLC address setting.

Replace or reseat the communication cable. Correct any address mismatches in the project configuration and re-download the project. Ensure bus termination resistors are enabled only at the two physical ends of the network.

Project download fails or transfer mode cannot be activated

Confirm the panel is in transfer mode by pressing the appropriate key combination during startup. Check the PC adapter cable connection and that the correct COM port or USB driver is selected in WinCC flexible.

Restart the panel and hold the transfer key during boot to force transfer mode. Reinstall the PC adapter driver on the engineering PC if the port is not recognized. Ensure the WinCC flexible project is compiled without errors before attempting the transfer.

Function keys do not respond or produce incorrect actions

Check the WinCC flexible project configuration to confirm the correct function key assignments are programmed. Inspect the membrane keypad for physical damage or contamination beneath the keys.

Re-download the project with corrected key assignments. If the keypad is physically damaged or keys are unresponsive despite correct configuration, the membrane keypad assembly requires replacement.

Panel repeatedly restarts or enters a boot loop

This may indicate a corrupted project file on the panel or a hardware fault with the internal memory. Attempt to enter transfer mode during startup to bypass the loaded project.

Force transfer mode and re-download a known good project from WinCC flexible. If the panel continues to restart even in transfer mode, the internal flash memory or main board may be faulty and the unit should be inspected by a qualified repair technician.

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