Siemens 6AV6355-1AA47-7CC0 OP 77A

€ 1.722,53

SKU: 6AV6355-1AA47-7CC0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CC0 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for human-machine interface applications in industrial automation environments. This unit is part of the Siemens SIMATIC HMI product line and provides a compact, robust interface for machine-level operator control and monitoring. The OP 77A is intended for use with Siemens SIMATIC S7 PLCs and other compatible controllers via standard communication interfaces.

The OP 77A features a monochrome LCD display with a resolution of 160 x 80 pixels, providing clear readout of process values, alarms, and status messages. It supports the MPI and PROFIBUS DP communication protocols, enabling direct integration into existing Siemens automation networks. The panel is configured using WinCC flexible software and supports function keys for direct operator input without a touchscreen. The device operates on a 24 V DC supply and is designed for panel-mount installation with an IP65 protection rating on the front face.

The OP 77A is widely used in manufacturing, packaging, and process automation applications where a cost-effective, reliable operator interface is required at the machine level. Its compact form factor makes it suitable for integration into control cabinets and machine panels with limited space. The panel is commonly found in automotive assembly lines, food and beverage processing equipment, and general-purpose industrial machinery where basic process visualization and operator input are required.

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 mount
Configuration Software	WinCC flexible 2005 or higher
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 10000: Connection to the PLC cannot be established. Communication link between the OP 77A and the configured controller is unavailable.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the configuration in WinCC flexible. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted after initial communication was established.
Inspect cable integrity and connector seating. Check for network address conflicts on the MPI or PROFIBUS segment. Verify PLC program is still running.
Event ID: 20000: No project is loaded on the device. The panel starts without a valid configuration.
Transfer a valid WinCC flexible project to the panel using the configured download method. Ensure the project is compiled without errors before transfer.
Event ID: 40000: System memory low. The available memory for runtime operation is insufficient.
Reduce the number of active alarms or data records in the project. Optimize the WinCC flexible project to reduce memory usage and re-download to the device.
Event ID: 50000: Alarm buffer overflow. The number of pending alarms exceeds the buffer capacity of the panel.
Acknowledge and clear existing alarms. Review the alarm configuration in WinCC flexible to reduce simultaneous alarm generation or increase acknowledgement frequency.
Event ID: 70000: Illegal system state detected. The panel runtime has encountered an unexpected internal condition.
Perform a controlled power cycle of the panel. If the condition persists, reload the project from WinCC flexible and check for firmware compatibility.
Event ID: 80000: Firmware update failed or firmware version mismatch detected.
Re-initiate the firmware update using the correct firmware version compatible with the OP 77A hardware revision. Use the Siemens ProSave tool or WinCC flexible to perform the update.

Frequently Asked Questions

Which communication protocols does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP communication protocols, allowing direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs. No Ethernet or PROFINET interface is available on this panel.

What software is used to configure the 6AV6355-1AA47-7CC0?

The OP 77A is configured using Siemens WinCC flexible 2005 or later versions. Projects are downloaded to the panel via the MPI interface or using the USB/serial transfer cable.

What is the supply voltage for this operator panel?

The panel requires a 24 V DC supply with an acceptable range of 19.2 V DC to 28.8 V DC. A regulated DC power supply should be used to ensure stable operation.

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

The front face of the OP 77A 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 77A be used with S7-1200 or S7-1500 PLCs?

The OP 77A is not officially supported for use with S7-1200 or S7-1500 PLCs, as these controllers are designed for use with TIA Portal-based HMI panels. The OP 77A is intended for use with S7-300 and S7-400 series controllers via MPI or PROFIBUS DP.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel power connector. Verify the voltage is within the 19.2 V to 28.8 V range. Check the internal fuse if accessible.

Correct the supply voltage if out of range. Replace the power supply if it is faulty. If the display backlight has failed, the panel may require repair or replacement of the backlight unit.

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

Check whether a valid WinCC flexible project has been successfully downloaded to the panel. Verify the project was compiled without errors before transfer.

Recompile and re-download the project from WinCC flexible to the OP 77A. Ensure the correct panel type is selected in the project settings before downloading.

Communication error displayed; panel cannot connect to PLC

Inspect the MPI or PROFIBUS DP cable for damage, correct pinout, and proper termination at both ends of the network segment. Verify the PLC node address and baud rate match the panel configuration.

Replace damaged cables or connectors. Correct address and baud rate settings in the WinCC flexible project and re-download. Ensure only one active termination resistor is present at each end of the bus segment.

Function keys do not respond or register incorrect inputs

Check for physical damage to the keypad membrane. Verify the project configuration assigns the correct functions to the keys. Test key response in the panel's built-in service menu if available.

If the keypad membrane is damaged, the panel requires hardware repair or replacement. If the issue is configuration-related, update the key assignments in WinCC flexible and re-download the project.

Panel reboots repeatedly or freezes during operation

Check the supply voltage for ripple or instability using an oscilloscope. Verify the panel firmware version is compatible with the loaded project version. Check for excessive ambient temperature around the panel.

Stabilize the power supply and ensure adequate ventilation around the panel. Update the firmware to the correct version using ProSave. If the issue persists, the panel may require service or replacement of internal components.

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