Siemens 6AV6355-1AA47-7CD1 OP 77A

€ 2.995,00

SKU: 6AV6355-1AA47-7CD1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CD1 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. This compact panel operator unit is designed for human-machine interface applications, providing a keypad-based interface for machine monitoring and control without a touchscreen. It belongs to the SIMATIC HMI Basic Panels generation and is intended for use with Siemens SIMATIC S7 controllers and compatible systems.

The OP 77A features a monochrome LCD display with a resolution suitable for text and simple graphic representation, along with a membrane keypad for operator input. It supports MPI and PROFIBUS DP communication interfaces, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and offers function keys, system keys, and numeric entry capability for parameter input and status monitoring.

The 6AV6355-1AA47-7CD1 is typically deployed in machine-level control panels across manufacturing, packaging, and process automation environments. Its compact form factor and robust membrane keypad make it well suited for applications where a simple, reliable operator interface is required without the complexity or cost of a full graphical touchscreen panel. It is commonly found in conveyor systems, pumping stations, and general-purpose machine control cabinets.

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 mounting
Certifications	CE, UL, cULus
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes and System Events

Event ID: 10000: Communication error between the operator panel and the connected PLC. The panel cannot establish or maintain a connection to the configured controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the panel configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect communication cables for damage or loose connectors. Check bus termination and cable shielding. Restart the panel and PLC if the connection is not restored automatically.
Event ID: 20000: Configuration or project data on the panel is missing or corrupted.
Re-download the WinCC flexible project to the panel using a PC connection. Verify the project was compiled without errors before transfer.
Event ID: 40000: System memory or internal storage error detected on the panel.
Perform a factory reset of the panel and re-transfer the project. If the error persists, the panel may require hardware service or replacement.
Event ID: 10006: Incorrect PLC type or version configured in the project does not match the connected controller.
Verify the PLC type and firmware version in the WinCC flexible project settings. Recompile and download the corrected project to the panel.
Event ID: 10002: Tag or variable address configured in the project does not exist in the connected PLC program.
Check all tag addresses in the WinCC flexible project against the PLC data blocks and memory areas. Correct any mismatched addresses and re-download the project.
Event ID: 50000: Panel operating voltage is outside the permissible range.
Measure the 24 V DC supply voltage at the panel power connector. Ensure the supply is stable and within the specified tolerance. Check the power supply unit and wiring.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A panel?

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

What software is used to configure the 6AV6355-1AA47-7CD1?

The panel is configured using Siemens WinCC flexible 2005 or a later version. The project is compiled on a PC and downloaded to the panel via an MPI or PC/PPI cable.

Does the OP 77A support touchscreen input?

No, the OP 77A does not have a touchscreen. Operator input is performed exclusively via the integrated membrane keypad, which includes function keys, system keys, and numeric entry keys.

What is the front panel protection rating of this unit?

The front panel of the OP 77A carries an IP65 protection rating, making it suitable for installation in control panel doors where it may be exposed to dust and water spray.

Can the OP 77A display graphical content?

The OP 77A is primarily a text-based panel with a character LCD display. It supports basic text display and simple status indicators but is not designed for complex graphical HMI applications.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel power connector. Verify polarity is correct and the supply is within the specified range. Inspect the internal fuse if accessible.

Correct any wiring errors and ensure the power supply delivers a stable 24 V DC. Replace the power supply if the voltage is out of range. If the display remains blank with correct power, the panel may require internal repair or replacement.

Panel shows communication error and cannot connect to PLC

Verify MPI or PROFIBUS DP cable connections at both the panel and PLC ends. Check bus termination resistors are installed only at the physical ends of the bus. Confirm the PLC node address matches the address configured in the WinCC flexible project.

Reseat all connectors, replace damaged cables, and correct bus termination. Update the panel project if the PLC address has changed and re-download via WinCC flexible.

Project download to panel fails or is interrupted

Check the PC-to-panel communication cable and the selected transfer interface in WinCC flexible. Ensure the panel is in transfer mode before initiating the download.

Place the panel in transfer mode via the panel menu, select the correct interface in WinCC flexible, and retry the download. Use a known-good MPI or USB-to-MPI adapter if the issue persists.

Operator keys are unresponsive or register incorrect inputs

Inspect the membrane keypad surface for physical damage, contamination, or deformation. Test each key systematically using the panel's built-in key test function if available.

Clean the keypad surface with a dry cloth. If keys are physically damaged or the membrane is torn, the keypad assembly requires replacement. Contact a qualified repair technician for membrane keypad replacement.

Panel repeatedly restarts or resets unexpectedly

Monitor the 24 V DC supply for voltage dips or instability under load. Check for electromagnetic interference sources near the panel or communication cables.

Install a stable, adequately rated power supply. Add ferrite cores to communication cables if EMC interference is suspected. Ensure proper grounding of the panel and control cabinet.

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