Siemens 6AV6355-1AA47-7EK1 OP 77A

€ 955,52

SKU: 6AV6355-1AA47-7EK1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EK1 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for machine-level human-machine interface applications. This compact panel provides a key-based interface for process visualization and operator control, and is part of Siemens' SIMATIC HMI product line. It is intended for use in industrial environments where reliable, straightforward operator interaction is required without the need for a full touchscreen display.

The OP 77A features a monochrome LCD display and a membrane keypad with function keys, system keys, and numeric entry keys for operator input. It supports MPI and PROFIBUS DP communication interfaces, enabling direct integration with SIMATIC S7 PLCs. The panel is configured using WinCC flexible software and supports recipe management, alarm logging, and trend display functions. Its compact housing is designed for panel mounting with an IP65 protection rating on the front face.

The OP 77A is widely used in manufacturing automation, machine building, and process control applications where a cost-effective, robust operator terminal is needed. It is particularly suited for controlling and monitoring individual machines or production cells connected to SIMATIC S7-200, S7-300, or S7-400 PLCs. Industries such as automotive, food and beverage, packaging, and general manufacturing commonly deploy this panel for local operator stations.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
Input/Operating Voltage	24 V DC
Power Consumption	Max. 5 W
Communication Interface	MPI, PROFIBUS DP
IP/Protection Rating	IP65 (front), IP20 (rear)
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
Mounting	Panel mounting
Certifications	CE, UL
Configuration Software	WinCC flexible 2005 or higher
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Configuration error detected during startup; the loaded project is incompatible or corrupt.
Reload the project using WinCC flexible. Verify the project version matches the panel firmware version.
Event ID: 20000: Communication error with the connected PLC; connection to the controller has been lost.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify PLC address settings match the HMI project configuration.
Event ID: 40000: Tag read/write error; the HMI cannot access a configured PLC tag.
Verify the tag address in the WinCC flexible project matches the actual PLC data block or memory address. Check PLC program is running.
Event ID: 50000: Recipe data error; recipe records cannot be read or written correctly.
Check available memory on the panel. Re-transfer the project and recipe data using WinCC flexible.
Event ID: 60000: Alarm buffer overflow; the number of pending alarms has exceeded the buffer capacity.
Acknowledge and clear active alarms. Review alarm configuration to reduce unnecessary alarm triggers.
Event ID: 70000: System memory low; available runtime memory is insufficient for current operations.
Reduce the number of active screens, tags, or alarms in the project. Restart the panel to clear runtime memory.
Event ID: 80000: Firmware update error; a firmware transfer to the panel was interrupted or failed.
Retry the firmware update using ProSave or WinCC flexible. Ensure stable power supply during the update process.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

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 depending on configuration.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or later versions. Projects are transferred to the panel via MPI cable or a direct serial connection.

What is the supply voltage for the 6AV6355-1AA47-7EK1?

The panel operates on a 24 V DC supply voltage. Ensure the power source is within the specified tolerance range to avoid operational faults.

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 suitable for environments where dust and water spray may be present.

Can the OP 77A display graphical trend curves?

Yes, the OP 77A supports basic trend display functionality, allowing operators to view process value trends over time as configured in the WinCC flexible project.

Troubleshooting

Panel 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 acceptable range and that the supply can deliver sufficient current.

Correct the supply voltage if out of range. If voltage is correct, check internal fuse and replace if blown. If the display hardware is faulty, the panel may require repair or replacement.

HMI cannot establish communication with the PLC

Verify the MPI or PROFIBUS DP cable is properly connected and terminated at both ends. Check that the bus address configured in the HMI project matches the physical PLC address.

Replace or reseat the communication cable. Correct address settings in the WinCC flexible project and re-transfer. Ensure termination resistors are enabled only at the two physical ends of the bus.

Panel repeatedly restarts or enters an error loop on startup

The loaded project may be corrupt or incompatible with the current firmware version. Connect to the panel using ProSave to check firmware version and project status.

Perform a factory reset using ProSave and re-transfer a compatible project. Update the panel firmware if the project requires a newer version.

Function keys do not respond to operator input

Check for physical damage to the membrane keypad. Verify that the key functions are correctly assigned in the WinCC flexible project and that the project has been successfully transferred.

Re-transfer the project to ensure key assignments are active. If keys remain unresponsive after project transfer, the membrane keypad assembly may need replacement.

Alarms are not displayed on the panel

Check the alarm configuration in the WinCC flexible project. Verify that the alarm tags are correctly linked to PLC addresses and that the PLC is writing the expected values.

Correct any misconfigured alarm tags and re-transfer the project. Confirm the PLC program is setting the alarm bits as expected and that the HMI communication link is active.

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