Siemens 6AV6355-1AA47-7CB4 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7CB4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CB4 is an operator panel belonging to the OP 77A series, part of the SIMATIC HMI Basic Panels product family manufactured by Siemens. This compact operator panel is designed for straightforward machine-level visualization and control tasks, offering a monochrome display for process monitoring and operator interaction. It integrates into Siemens automation environments and is configured using the WinCC flexible engineering software.

The OP 77A features a monochrome STN LCD display with a resolution of 160 x 80 pixels, providing clear readability of process values, alarms, and status messages. It supports MPI and PROFIBUS DP communication interfaces, enabling direct connection to Siemens S7-200, S7-300, and S7-400 PLCs. The panel includes function keys for operator input, an integrated real-time clock, and non-volatile memory for project data retention without battery backup. The unit operates on a 24 V DC supply and is rated IP65 on the front face for protection against dust and water ingress.

The OP 77A is typically deployed in manufacturing, packaging, and process automation applications where a cost-effective, reliable operator interface is required at the machine level. Its compact form factor and robust front panel protection make it suitable for installation in control cabinet doors and machine enclosures across industries such as food and beverage, automotive, and general factory automation. The panel is well suited for applications requiring basic alarm management, recipe handling, and process value display without the need for a full graphical color interface.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Colors	Monochrome (blue/white)
Input/Operating Voltage	24 V DC
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
Series/Product Family	SIMATIC HMI OP 77A
Configuration Software	WinCC flexible 2005 or higher
PLC Compatibility	S7-200, S7-300, S7-400
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC. The connection to the controller has been interrupted or cannot be established.
Check MPI/PROFIBUS DP cable connections and terminating resistors. Verify the PLC address settings match the HMI project configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to PLC timed out. The panel did not receive a response from the controller within the expected time window.
Check network cable integrity and connector seating. Verify baud rate and station address settings on both the HMI and PLC. Reduce network cable length or check for bus termination issues.
Event ID: 20000: Project download error. A fault occurred during the transfer of the project from the engineering PC to the HMI panel.
Verify the transfer cable and PC interface settings. Ensure WinCC flexible is set to the correct transfer mode and the panel is in transfer mode. Retry the download after restarting both devices.
Event ID: 40000: System memory low. The available memory for runtime operation is insufficient to load or run the current project.
Reduce the project size by removing unused screens, tags, or alarm entries. Recompile and re-download the project using WinCC flexible.
Event ID: 50000: Operating system error. An internal system fault has been detected in the HMI panel firmware.
Perform a panel reset by cycling power. If the fault persists, update or reinstall the panel firmware using the appropriate Siemens ProSave tool.
Event ID: 60000: Tag read/write error. A configured tag could not be read from or written to the connected PLC.
Verify the tag address in the WinCC flexible project matches the actual PLC data block or memory address. Check PLC program for address conflicts or protected data areas.

Frequently Asked Questions

Which PLCs are compatible with the Siemens OP 77A (6AV6355-1AA47-7CB4)?

The OP 77A is compatible with Siemens S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with other controllers supported by WinCC flexible drivers.

What software is required 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 connected to the MPI interface.

What is the supply voltage for the OP 77A?

The OP 77A operates on a 24 V DC supply voltage. Ensure the power supply is within the specified tolerance range to avoid panel faults.

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

The front face of the OP 77A is rated IP65, providing protection against dust ingress and low-pressure 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 functionality, allowing operators to store and transfer parameter sets between the HMI and the connected PLC.

Troubleshooting

Display remains blank after power on

Check that 24 V DC is present at the power supply terminals. Measure voltage directly at the panel connector to rule out wiring faults. Inspect for any visible damage to the unit.

Verify and restore the 24 V DC supply. If voltage is correct and the display remains blank, the internal power supply or backlight may have failed and the unit should be sent for repair or replacement.

HMI panel shows communication error 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 station address in the HMI project matches the actual PLC configuration.

Replace or reseat the communication cable. Correct any address mismatches in the WinCC flexible project and re-download. Ensure bus termination resistors are enabled only at the physical ends of the network.

Panel does not enter transfer mode for project download

Confirm the panel is set to transfer mode either via the Start Center menu or by holding the appropriate key combination during boot. Check that the PC adapter is correctly connected and the COM port or USB driver is functioning.

Restart the panel and access the Start Center to manually select Transfer mode. Reinstall the PC adapter driver on the engineering PC if the connection is not recognized. Verify the correct interface is selected in WinCC flexible transfer settings.

Operator function keys are unresponsive

Check whether the issue affects all keys or specific keys only. Test key response in the panel's Start Center menu to determine if the fault is hardware or project-related.

If keys are unresponsive in the Start Center, the keypad membrane may be damaged and requires hardware repair. If keys work in the Start Center but not in the project, review the key assignments in the WinCC flexible project and re-download.

Alarm messages are not displayed on the panel

Verify that the alarm tags are correctly configured in the WinCC flexible project and that the corresponding PLC bit addresses are correct. Check the PLC program to confirm alarm bits are being set as expected.

Correct any tag address mismatches in the alarm configuration and re-download the project. Confirm the PLC program logic is activating the alarm bits. Ensure the alarm view object is present and correctly configured on the relevant HMI screen.

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