Siemens 6AV6355-1AA47-7AA1 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7AA1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7AA1 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. 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 SIMATIC HMI product line, which is widely used across Siemens automation environments.

The OP 77A features a monochrome LCD display and a membrane keypad for operator input, offering a reliable and robust interface without the complexity of a touchscreen. It supports the MPI and PROFIBUS DP communication protocols, enabling direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. Configuration is performed using Siemens WinCC flexible software, and the panel includes onboard flash memory for storing project data and recipes.

The OP 77A is suited for use in machine building, manufacturing automation, and process control environments where a compact, cost-effective operator interface is required. It is commonly found on standalone machines, conveyor systems, and packaging equipment where operators need to input parameters, view process values, and acknowledge alarms. Its compact form factor and panel-mount design make it appropriate for integration into control cabinets and machine enclosures.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	4 W (typical)
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
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400

Common Error Codes & System Events

Event ID: 10000: Communication error between the OP 77A and the connected PLC. The panel cannot establish or maintain a connection to the controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the project configuration in WinCC flexible.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect the communication cable for damage. Verify the PLC is powered and running. Check bus termination and cable shielding.
Event ID: 20000: Project download error. The project could not be transferred to the panel successfully.
Check the PC-to-panel transfer cable and connection. Ensure the panel is in transfer mode and that the WinCC flexible project is compatible with the OP 77A firmware version.
Event ID: 40000: System memory low. Insufficient memory available for the current project or runtime data.
Reduce the project size by removing unused screens, tags, or recipes. Re-download the optimized project to the panel.
Event ID: 50000: Firmware version mismatch. The firmware on the panel is not compatible with the downloaded project.
Update the panel firmware using WinCC flexible or ProSave to match the version required by the project.
Event ID: 60000: Internal device error detected during self-test at startup.
Perform a factory reset of the panel. If the error persists, the panel hardware may require service or replacement.
Event ID: 70000: Tag limit exceeded. The number of configured tags in the project exceeds the panel's supported maximum.
Review the project in WinCC flexible and reduce the number of configured tags to within the OP 77A specification limits.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7AA1)?

The OP 77A is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP communication interfaces.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later version. Projects are downloaded to the panel via a PC adapter cable.

What is the supply voltage for the 6AV6355-1AA47-7AA1?

The panel operates on 24 V DC supply voltage, which is standard for SIMATIC HMI operator panels.

What is the IP protection rating of the OP 77A?

The front face of the OP 77A is rated IP65, making it resistant to dust and water jets. The rear of the unit is rated IP20.

Does the OP 77A support recipe management?

Yes, the OP 77A supports basic recipe management functions, allowing operators to store and recall parameter sets directly on the panel using its onboard flash memory.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel's power connector using a multimeter. Verify polarity is correct and voltage is within specification.

Ensure the power supply is providing stable 24 V DC. If voltage is correct and the display remains blank, the internal power supply or display unit may be faulty and the panel should be inspected or replaced.

Panel shows 'No connection to PLC' message at startup

Verify the MPI or PROFIBUS DP cable is securely connected at both the panel and PLC ends. Check that bus termination resistors are correctly placed at both ends of the bus segment.

Correct any wiring faults, replace damaged cables, and ensure the PLC station address configured in the WinCC flexible project matches the actual PLC address. Restart both the panel and PLC after corrections.

Project download fails or transfer does not start

Confirm the panel is set to transfer mode via the panel's start screen. Check that the correct transfer cable and COM port settings are selected in WinCC flexible on the PC.

Switch the panel to transfer mode manually, verify cable integrity, and retry the download. If the issue persists, update the panel firmware using ProSave before attempting the project transfer again.

Operator keys are unresponsive or intermittently fail

Inspect the membrane keypad for physical damage, contamination, or wear. Test each key systematically using a diagnostic screen if available in the project.

Clean the keypad surface with a dry cloth. If individual keys are permanently unresponsive, the membrane keypad assembly may need to be replaced as a service part.

Panel repeatedly restarts or crashes during operation

Check the 24 V DC supply for voltage dips or instability using an oscilloscope or data logger. Review the project for excessively high tag update rates or communication polling loads.

Stabilize the power supply by adding filtering capacitors or replacing the power supply unit. Optimize the WinCC flexible project by reducing tag update frequencies and re-download the project to the panel.

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