Siemens 6AV6355-1AA47-7CL0 OP 77A

€ 882,11

SKU: 6AV6355-1AA47-7CL0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CL0 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. It is a compact, key-operated operator panel designed for machine-level human-machine interface applications, providing a straightforward interface for process monitoring and control. The OP 77A is part of the SIMATIC HMI Basic Panels generation and is intended for use with Siemens SIMATIC S7 controllers via direct or network-based connections.

The OP 77A features a monochrome LCD display and a membrane keypad for operator input, supporting function keys and system keys for navigation and control. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration into Siemens automation networks. The panel is configured using WinCC flexible software and supports basic alarm management, recipe handling, and trend display functions. Its compact housing is rated IP65 on the front face, making it suitable for panel mounting in industrial enclosures.

The OP 77A is widely used in manufacturing, machine building, and process automation environments where a cost-effective, reliable operator interface is required at the machine level. It is commonly found on packaging machinery, conveyor systems, and general-purpose industrial machines where operators need to monitor status, acknowledge alarms, and adjust setpoints. Its compatibility with the SIMATIC S7 controller family and straightforward configuration make it a practical choice for OEMs and system integrators.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.5 W
Communication Interface	MPI, PROFIBUS DP
IP Rating (Front)	IP65
IP 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 mounting
Configuration Software	WinCC flexible 2005 or higher
Certifications	CE, UL, cULus
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Connection to the PLC could not be established or was interrupted.
Check MPI/PROFIBUS cable connections, verify PLC address settings, and confirm the communication parameters in WinCC flexible match the controller configuration.
Event ID: 10001: Communication timeout with the configured controller.
Verify the PLC is powered and running, check network cabling and termination resistors on the PROFIBUS/MPI network, and confirm baud rate settings.
Event ID: 20000: Configuration download failed or project data is corrupted.
Re-download the project from WinCC flexible, ensure the correct panel type is selected in the project, and verify USB/serial transfer cable integrity.
Event ID: 40000: Internal device error detected during self-test at startup.
Perform a factory reset of the panel. If the error persists, the unit may require repair or replacement of internal components.
Event ID: 50000: Power supply voltage out of specified range.
Measure the 24 V DC supply at the panel connector. Ensure the supply is within the specified tolerance and check for voltage drops under load.
Event ID: 60000: Alarm buffer overflow — too many unacknowledged alarms.
Acknowledge pending alarms on the panel. Review the alarm configuration in WinCC flexible to reduce unnecessary alarm triggers or increase buffer size.

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 Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs.

What software is required to configure the 6AV6355-1AA47-7CL0?

The panel is configured using Siemens WinCC flexible 2005 or a later compatible version. The correct panel type must be selected within the WinCC flexible project.

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

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

What is the supply voltage for this operator panel?

The OP 77A requires a 24 V DC power supply, with a maximum power consumption of approximately 4.5 W.

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 or PROFIBUS DP. Compatibility with S7-1200 or S7-1500 is limited and not officially supported; newer SIMATIC Basic Panels are recommended for those controllers.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel power connector using a multimeter. Verify the supply is within tolerance and that the connector is fully seated.

Restore correct 24 V DC supply. If voltage is correct and display remains blank, the internal power supply or backlight may be faulty and the unit should be sent for repair.

Panel shows 'No connection to PLC' or communication error at startup

Verify MPI or PROFIBUS DP cable is connected and undamaged. Check that the PLC address and baud rate configured in WinCC flexible match the actual PLC settings. Confirm termination resistors are correctly placed on the network.

Correct any address or baud rate mismatches in the WinCC flexible project and re-download. Replace damaged cables and ensure proper network termination.

Project download to panel fails

Check the transfer cable connection between the PC and the panel. Confirm the panel is in transfer mode and that the correct COM port or USB adapter is selected in WinCC flexible.

Restart the panel in transfer mode, select the correct interface in WinCC flexible, and retry the download. Replace the transfer cable if communication cannot be established.

Function keys do not respond or produce incorrect actions

Inspect the membrane keypad for physical damage or contamination. Verify the key assignments in the WinCC flexible project are correctly configured and the project has been fully downloaded.

Clean the keypad surface if contaminated. If keys are physically damaged, the membrane keypad assembly requires replacement. Re-download the project if key assignments are incorrect.

Panel repeatedly restarts or resets unexpectedly

Monitor the 24 V DC supply for voltage dips or instability under load. Check for loose wiring at the power connector. Review the event log for internal fault events.

Stabilize the power supply and secure all wiring connections. If restarts continue with a stable supply, the unit likely has an internal hardware fault and should be inspected or repaired.

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