Siemens 6AV6355-4AA00-0AA0 OP 77A

€ 2.495,00

SKU: 6AV6355-4AA00-0AA0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-4AA00-0AA0 is the OP 77A operator panel, part of the SIMATIC HMI Basic Panels product family. This compact operator panel is designed for straightforward machine-level human-machine interface applications and is manufactured by Siemens as part of their SIMATIC HMI portfolio. It provides a text-based display interface for monitoring and controlling industrial processes without the need for a full graphical touchscreen.

The OP 77A features a 4-line STN LCD text display capable of showing alphanumeric characters, with membrane keypad input for operator interaction. It communicates via MPI and PROFIBUS DP interfaces, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible Compact or Standard engineering software and supports a limited number of tags, alarm messages, and recipe management functions suited to entry-level HMI requirements.

The OP 77A is commonly deployed in manufacturing machinery, conveyor systems, packaging equipment, and general-purpose industrial automation where a cost-effective, robust operator interface is required. Its compact form factor and membrane keypad make it suitable for environments where a touchscreen is unnecessary or impractical, and its compatibility with the SIMATIC S7 controller family makes it a natural fit for Siemens-based automation architectures.

Technical Specifications

Display Type	STN LCD, text-based
Display Lines	4 lines
Characters per Line	20 characters
Input Method	Membrane keypad
Communication Interface	MPI / PROFIBUS DP
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Engineering Software	WinCC flexible Compact / Standard
Input Voltage	24 V DC
Power Consumption	Approx. 3 W
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
Mounting	Panel mounting
Certifications	CE, UL

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.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the panel configuration in WinCC flexible.
Event ID: 10001: PLC is not responding or is in STOP mode.
Check PLC operating mode and ensure it is in RUN. Verify network address and baud rate settings on both the panel and PLC.
Event ID: 20000: Configuration download error. The project could not be transferred to the panel.
Verify the PC-to-panel transfer cable is correctly connected. Check that the panel is in transfer mode and that the WinCC flexible project is compatible with the OP 77A.
Event ID: 40000: Tag read/write error. A configured tag could not be read from or written to the PLC.
Verify the tag address exists in the PLC program and that the data type matches the configuration in WinCC flexible.
Event ID: 50000: Internal device error or hardware fault detected.
Perform a panel restart. If the fault persists, check the 24 V DC supply voltage and inspect the unit for physical damage. Consider replacing the panel.
Event ID: 60000: Alarm buffer overflow. The number of pending alarms exceeds the panel buffer capacity.
Acknowledge and clear existing alarms. Review the alarm configuration in WinCC flexible to reduce unnecessary alarm triggers.
Event ID: 70000: Recipe data error. A recipe could not be read or written correctly.
Check the recipe configuration in WinCC flexible. Verify that the associated PLC data blocks are correctly defined and accessible.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-4AA00-0AA0)?

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 Compact or WinCC flexible Standard engineering software.

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 panel of the OP 77A carries an IP65 protection rating, making it suitable for environments where dust and water spray may be present.

Does the OP 77A support touchscreen input?

No, the OP 77A uses a membrane keypad for operator input and does not feature a touchscreen display.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel power connector. Verify polarity and measure actual voltage under load.

Ensure the supply voltage is within the specified 24 V DC range. Replace the power supply if voltage is absent or out of tolerance. If supply is correct, the internal power circuit of the panel may be faulty and the unit should be repaired or replaced.

Panel shows communication error and cannot connect to PLC

Inspect the MPI or PROFIBUS DP cable for damage or loose connectors. Verify bus termination is correctly applied at both ends of the network. Check that the PLC node address and baud rate match the panel configuration.

Replace or reseat the communication cable. Correct the node address and baud rate settings in WinCC flexible and re-download the project. Ensure bus termination resistors are active only at the physical ends of the network.

Project transfer from PC to panel fails

Confirm the panel is set to transfer mode by navigating to the transfer settings on the panel. Check the PC-to-panel transfer cable and the COM or USB port settings on the PC.

Set the panel to transfer mode, verify the correct transfer cable is used, and re-initiate the download from WinCC flexible. Ensure no firewall or port conflict is blocking the transfer on the PC.

Keypad buttons are unresponsive or intermittent

Inspect the membrane keypad surface for physical damage, contamination, or wear. Test each key systematically in the panel's diagnostic or transfer mode if available.

Clean the keypad surface with a dry cloth. If keys remain unresponsive, the membrane keypad assembly is likely worn or damaged and the panel should be sent for repair or the keypad replaced.

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 and inspect the environment for excessive electrical noise.

Stabilize the power supply and ensure adequate current capacity. Add filtering or use a dedicated power supply for the panel. If restarts continue with a stable supply, the internal hardware may be faulty and the unit should be inspected for repair.

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