Siemens 6AV6355-4AA00-0AA3 OP 77A

€ 1.995,00

SKU: 6AV6355-4AA00-0AA3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-4AA00-0AA3 is the OP 77A operator panel, part of the SIMATIC HMI Basic Panels product family from Siemens. This compact operator panel is designed for straightforward machine-level human-machine interface tasks, providing a text-based display for monitoring and control of automated processes. It belongs to the established SIMATIC HMI portfolio and is intended for use as a local operator interface in industrial control systems.

The OP 77A features a 4-line text display capable of showing alphanumeric characters, enabling operators to view process values, alarms, and status messages. It communicates via MPI and PROFIBUS DP interfaces, allowing direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and supports recipe management, alarm logging, and multilingual text display. Its compact and robust housing is rated for industrial environments with a protection class of IP65 on the front face.

The OP 77A is typically deployed in manufacturing machinery, conveyor systems, packaging equipment, and process automation installations where a cost-effective, text-based operator interface is sufficient. Its compatibility with the SIMATIC S7 controller family makes it a practical choice for retrofit and new-build projects in discrete manufacturing and light process industries. The panel's small footprint and panel-mount design allow integration into standard control cabinets and machine enclosures.

Technical Specifications

Display Type	Text display, 4 lines
Display Characters per Line	20 characters
Input/Operating Voltage	24 V DC
Power Consumption	4 W (typical)
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 mounting
Certifications	CE, UL, cULus
Configuration Software	WinCC flexible 2008 or later
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400

Common Error Codes & System Events

Event ID: 1000: System startup completed. The HMI device has successfully booted and the runtime is active.
No action required. This is an informational event confirming normal startup.
Event ID: 10000: Connection to PLC lost. Communication between the OP 77A and the configured controller has been interrupted.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify PLC is powered and in RUN mode. Check configured station address and baud rate settings.
Event ID: 10001: Connection to PLC established. Communication link has been successfully restored or initialized.
No action required. This is an informational event confirming communication is active.
Event ID: 20000: Tag read error. The HMI device cannot read the value of a configured process tag from the PLC.
Verify the tag address exists in the PLC program. Check that the data block or memory area referenced is correctly defined and accessible.
Event ID: 20001: Tag write error. The HMI device cannot write a value to the configured process tag in the PLC.
Check that the target PLC address is writable and not write-protected. Verify the tag configuration in WinCC flexible matches the PLC data structure.
Event ID: 40000: Recipe data error. An error occurred during reading or writing of recipe data.
Check recipe configuration in WinCC flexible. Verify that the recipe data records are correctly defined and that sufficient memory is available.
Event ID: 70010: Project download error. A project transfer to the HMI device was interrupted or failed.
Restart the transfer process. Ensure the correct communication interface and transfer settings are selected in WinCC flexible. Check cable integrity.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-4AA00-0AA3)?

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

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are transferred to the panel via the MPI or PROFIBUS DP interface.

What is the supply voltage for the OP 77A?

The OP 77A requires a 24 V DC supply voltage for 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, suitable for panel-mount installation in industrial environments.

Can the OP 77A display alarm messages?

Yes, the OP 77A supports alarm and event display. Alarms configured in the WinCC flexible project are shown on the text display and can be acknowledged directly from the operator panel.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the power connector. Measure voltage with a multimeter to confirm it is within the specified range. Inspect the supply cable and connector for damage.

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

No communication with PLC, connection error displayed

Verify the MPI or PROFIBUS DP cable is securely connected at both the OP 77A and the PLC. Check bus termination at both ends of the network. Confirm the station address and baud rate configured in WinCC flexible match the PLC network settings.

Correct any wiring faults, ensure proper bus termination resistors are in place, and align the station address and baud rate settings between the HMI project and the PLC network configuration. Restart both devices after corrections.

Project transfer from WinCC flexible fails

Check the transfer cable connection between the PC and the OP 77A. Verify the panel is in transfer mode, which can be activated via the panel's loader menu. Confirm the correct communication port and transfer settings are selected in WinCC flexible.

Place the OP 77A in transfer mode manually via the system menu, select the correct interface in WinCC flexible, and retry the transfer. Replace the transfer cable if communication cannot be established.

Operator panel displays incorrect or frozen process values

Check the PLC program to confirm the source tags are being updated correctly. Verify the tag addresses in the WinCC flexible project match the actual PLC memory locations. Check for communication errors in the HMI alarm list.

Correct any tag address mismatches in the WinCC flexible project and reload the project to the panel. If the PLC program is not updating the relevant data areas, review and correct the PLC logic.

Panel buttons or keys do not respond

Inspect the keypad membrane for physical damage or contamination. Attempt to navigate the panel's built-in loader menu to determine if the hardware keys are functional at the system level.

Clean the keypad area if contamination is present. If keys remain unresponsive at the loader level, the keypad membrane or internal PCB may be faulty and the unit should be inspected and repaired by a qualified technician.

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