Siemens 6AV6355-1AA47-7DC3 OP 77A

€ 955,52

SKU: 6AV6355-1AA47-7DC3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7DC3 is an operator panel belonging to the OP 77A series, part of the SIMATIC HMI product line. This compact panel operator unit is designed for machine-level human-machine interface applications and provides a keypad-based interface for process monitoring and control. It is manufactured by Siemens and integrates into the broader SIMATIC automation environment.

The OP 77A features a monochrome LCD display with a resolution suitable for text and simple graphic representation, along with a membrane keypad for operator input. It supports MPI and PROFIBUS DP communication interfaces, enabling direct connection to SIMATIC S7 PLCs. The unit operates on 24 V DC supply voltage and is built to withstand industrial environments, carrying a front panel protection rating of IP65.

The OP 77A is typically deployed in machine building, manufacturing automation, and process control applications where a cost-effective, robust operator interface is required. It is well suited for controlling and monitoring individual machines or production cells connected to SIMATIC S7-200, S7-300, and S7-400 controllers. Its compact form factor and keypad-based operation make it appropriate for panel mounting in space-constrained control cabinets.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 inches (diagonal)
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
Voltage Range	19.2 V DC to 28.8 V DC
Power Consumption	Max. 6 W
Communication Interface	MPI, PROFIBUS DP
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
Protection Rating (Front)	IP65
Protection Rating (Rear)	IP20
Mounting	Panel mounting
Certifications	CE, UL, cULus
Series	SIMATIC HMI OP 77A

Common Error Codes and System Events

Event ID: 10000: Configuration error detected during startup; the loaded configuration is incompatible with the panel firmware version.
Reload the project using SIMATIC WinCC flexible and ensure the firmware version matches the target panel version.
Event ID: 20000: Communication link to the PLC has been interrupted or cannot be established.
Check MPI or PROFIBUS DP cable connections, verify bus address settings, and confirm PLC is powered and in RUN mode.
Event ID: 40000: No project loaded on the panel; the device has started without a valid configuration.
Transfer a valid WinCC flexible project to the panel using the configured download interface.
Event ID: 50000: Internal memory error detected; the project data stored in flash memory may be corrupted.
Perform a factory reset and re-transfer the project. If the error persists, the panel may require service or replacement.
Event ID: 60000: Firmware update error; the firmware transfer was interrupted or the firmware file is incompatible.
Retry the firmware update using ProSave or WinCC flexible, ensuring the correct firmware version for the OP 77A is used.
Communication Error: Bus address conflict detected on the MPI or PROFIBUS DP network.
Verify that each device on the bus has a unique address. Reconfigure the panel address in the WinCC flexible project settings.
Tag Error: A configured tag cannot be read or written; the PLC address referenced in the project does not exist.
Check the PLC program to confirm the data block or memory address exists and matches the tag configuration in the HMI project.

Frequently Asked Questions

Which PLCs are compatible with the Siemens OP 77A (6AV6355-1AA47-7DC3)?

The OP 77A is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with S7-200 via PPI protocol.

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

The OP 77A is configured using Siemens SIMATIC WinCC flexible software. Projects are downloaded to the panel via the MPI interface or using a PC adapter.

What is the supply voltage for the 6AV6355-1AA47-7DC3?

The panel operates on 24 V DC with an acceptable input 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 carries an IP65 protection rating, making it resistant to dust and water jets, suitable for industrial panel mounting.

Can the OP 77A display graphical elements or only text?

The OP 77A supports basic graphics in addition to text display on its monochrome LCD, allowing simple bar graphs and symbols alongside alphanumeric information.

Troubleshooting

Display remains blank after power is applied

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

Correct the supply voltage if out of range. Replace a blown fuse with the correct rating. If the display remains blank with correct supply voltage, the panel backlight or internal power board may require replacement.

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 bus termination resistors are correctly placed at both ends of the bus. Confirm the PLC bus address matches the address configured in the WinCC flexible project.

Reseat all connectors, correct bus termination, and verify address settings in both the PLC and the HMI project. Re-download the project if configuration changes are made.

Project transfer from PC to panel fails

Check the PC adapter connection to the MPI port on the panel. Verify the correct COM port and transfer speed are selected in WinCC flexible or ProSave. Confirm the panel is in transfer mode.

Set the panel to transfer mode via the panel's start center menu. Ensure the PC adapter drivers are correctly installed and the baud rate matches on both sides. Retry the download.

Operator keypad inputs are not responding

Check for physical damage to the membrane keypad. Attempt to navigate menus using different keys to isolate whether the fault is with specific keys or the entire keypad.

If individual keys are unresponsive due to membrane wear, the keypad membrane assembly should be replaced. If no keys respond, inspect the internal ribbon cable connection between the keypad and the main board.

Panel restarts repeatedly or enters a boot loop

Attempt to access the start center during boot by pressing the appropriate key combination. Check if a valid project is loaded and whether the firmware version is compatible with the project.

Perform a factory reset from the start center and re-transfer a compatible project and firmware version using ProSave. If the boot loop continues, the panel may have a hardware fault requiring service.

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