Siemens 6AV6355-1AA47-7CF2 OP 77A

€ 2.495,00

SKU: 6AV6355-1AA47-7CF2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CF2 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for human-machine interface applications in industrial automation environments. This compact panel provides a keypad-based interface for machine monitoring and control, and is part of Siemens' SIMATIC HMI product line. It is intended for use with SIMATIC S7 PLCs and other compatible Siemens controllers.

The OP 77A features a monochrome LCD display and a membrane keypad with function keys, system keys, and numeric entry capability. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration into Siemens automation networks. The unit operates on a 24 V DC supply and supports configuration through Siemens WinCC flexible engineering software. Its compact and robust construction is suited for panel-mount installation in industrial cabinets.

The OP 77A is commonly deployed in manufacturing, machine building, and process automation applications where a cost-effective, reliable operator interface is required. It is well suited for machinery requiring straightforward parameter entry, status display, and alarm management without the need for a full graphical touchscreen panel. Typical installations include packaging machines, conveyor systems, and general-purpose industrial machinery.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input Voltage	24 V DC
Voltage Tolerance	19.2 V DC to 28.8 V DC
Communication Interface	MPI, PROFIBUS DP
Configuration Software	WinCC flexible 2005 or higher
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 mount
Certifications	CE, UL, cULus
Series	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Connection to PLC lost or communication timeout on MPI/PROFIBUS DP interface.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify PLC is powered and running. Check configured station address matches the PLC.
Event ID: 10001: Connection to configured PLC could not be established at startup.
Verify communication parameters (baud rate, station address) in WinCC flexible project match the PLC configuration. Check physical cable integrity.
Event ID: 40000: No project loaded on the operator panel.
Transfer a valid WinCC flexible project to the panel using the configured download interface. Ensure the project is compiled without errors before transfer.
Event ID: 40001: Project transfer interrupted or incomplete.
Retry the project download from the WinCC flexible engineering station. Check the transfer cable and ensure the panel is in transfer mode.
Event ID: 20000: Tag read error — the panel cannot read a configured PLC tag.
Verify the tag address in the WinCC flexible project matches the actual PLC data block or memory area. Check PLC program for correct data structure.
Event ID: 20001: Tag write error — the panel cannot write a value to the configured PLC tag.
Check that the target PLC memory area is not write-protected. Verify tag address and data type configuration in the WinCC flexible project.
Event ID: 70010: Internal device error or firmware fault detected.
Perform a power cycle of the panel. If the fault persists, perform a factory reset and re-transfer the project. Contact Siemens technical support if the issue continues.

Frequently Asked Questions

What communication interfaces does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP communication interfaces, allowing direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs.

What software is required to configure the 6AV6355-1AA47-7CF2?

The panel is configured using Siemens WinCC flexible 2005 or a later version. Projects are downloaded to the panel via the MPI or PROFIBUS DP interface.

What is the supply voltage for this operator panel?

The OP 77A requires a 24 V DC supply voltage, with an acceptable range of 19.2 V DC to 28.8 V DC.

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

The front panel of the OP 77A is rated IP65, making it resistant to dust ingress and low-pressure water jets, suitable for industrial panel-mount installations.

Can the OP 77A be used with S7-1200 or S7-1500 PLCs?

The OP 77A is primarily designed for use with S7-200, S7-300, and S7-400 PLCs via MPI and PROFIBUS DP. Compatibility with S7-1200 and S7-1500 is limited and should be verified against the specific firmware and WinCC flexible version in use.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Check that the voltage is within the 19.2 V DC to 28.8 V DC range. Inspect the supply cable and connector for damage.

Correct the supply voltage if out of range. Replace the power supply cable or connector if damaged. If the display remains blank with correct voltage, the internal power supply or display unit may require repair or replacement.

Panel displays 'No project' or starts in transfer mode unexpectedly

Check whether a valid WinCC flexible project has been successfully transferred to the panel. A missing or corrupted project will cause the panel to display a transfer prompt on startup.

Compile and re-transfer the WinCC flexible project to the panel. Ensure the transfer completes without errors. If the panel repeatedly loses its project, check the internal memory for faults.

Communication error displayed — cannot connect to PLC

Verify the MPI or PROFIBUS DP cable is securely connected at both the panel and PLC ends. Check bus termination at both ends of the network. Confirm the station address and baud rate configured in the project match the PLC settings.

Correct any wiring or termination issues. Adjust the communication parameters in the WinCC flexible project to match the PLC configuration, then re-transfer the project and power cycle both devices.

Function keys do not respond or produce incorrect actions

Check the WinCC flexible project configuration for the function key assignments. Verify that the correct screen is active and that the key assignments are not overridden by a global function key template.

Review and correct the function key configuration in WinCC flexible. Re-transfer the updated project to the panel. If keys are physically unresponsive, the membrane keypad may require replacement.

Panel freezes or becomes unresponsive during operation

Check for communication overload on the MPI/PROFIBUS DP network. Review the WinCC flexible project for excessive tag update rates or script errors that may cause the panel CPU to overload.

Reduce tag update rates in the WinCC flexible project where possible. Correct any script errors. Perform a power cycle to restore normal operation. If freezing persists, perform a firmware update or factory reset and re-transfer the project.

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