Siemens 6AV6355-1AA47-7CM2 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7CM2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CM2 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for human-machine interface applications in industrial automation environments. This compact panel operator unit is part of Siemens' SIMATIC HMI product line and serves as a key interface device for monitoring and controlling machine processes. It is intended for use with SIMATIC S7 controllers and other compatible Siemens automation systems.

The OP 77A features a monochrome display with a membrane keypad for operator input, providing a robust and reliable interface in demanding industrial conditions. It supports MPI and PROFIBUS DP communication interfaces, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs. The unit is configured using WinCC flexible software and offers a defined number of tags, screens, and alarm functions suited to small and mid-range machine applications. Its compact housing is designed for panel mounting with a defined cutout dimension.

The OP 77A is commonly deployed in machine building, packaging machinery, conveyor systems, and general factory automation where a cost-effective, reliable operator interface is required. Its compatibility with the SIMATIC controller family makes it a practical choice for OEMs and system integrators working within the Siemens automation ecosystem. The panel is suited for environments where a simple, text-based or basic graphical interface is sufficient for process visualization and operator control.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 inches
Communication Interface	MPI, PROFIBUS DP
Operating Voltage	24 V DC
Power Consumption	Max. 6 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
IP Rating (Rear)	IP20
Mounting	Panel mounting
Configuration Software	WinCC flexible 2005 or higher
Series/Product Family	SIMATIC HMI OP 77A
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings and ensure the PLC is in RUN mode.
Event ID: 10001: Connection to the configured PLC has been interrupted or cannot be established.
Inspect the communication cable for damage. Confirm bus address configuration in WinCC flexible matches the physical PLC address.
Event ID: 20000: Project download error — the project could not be transferred to the HMI panel.
Verify the PC-to-panel connection (MPI or USB adapter). Ensure WinCC flexible version is compatible with the panel firmware version.
Event ID: 40000: System memory low — available memory on the HMI device is insufficient.
Reduce the number of screens, tags, or alarm entries in the project. Perform a full project download after optimization.
Event ID: 50000: Firmware version mismatch between the project and the panel firmware.
Update the panel firmware using WinCC flexible or ProSave to match the version required by the project.
Event ID: 60000: 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.
Event ID: 70000: Configuration error — a configured tag or screen references an invalid PLC address.
Review the project in WinCC flexible and correct any invalid tag addresses. Re-download the project to the panel.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7CM2)?

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

What software is used to configure and program the OP 77A?

The OP 77A is configured using Siemens WinCC flexible software, version 2005 or later. Projects are downloaded to the panel via MPI adapter or USB-to-MPI interface.

What is the supply voltage for the 6AV6355-1AA47-7CM2?

The panel operates on a 24 V DC supply voltage, which is standard for SIMATIC HMI operator panels.

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.

Can the OP 77A be used with third-party PLCs?

The OP 77A is primarily designed for use with Siemens SIMATIC controllers. While WinCC flexible supports some third-party drivers, compatibility with non-Siemens PLCs should be verified against the specific driver availability in the software.

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.

Ensure the power supply is stable and within the 24 V DC specification. If voltage is correct and display remains blank, the internal power supply or display unit may be faulty and require repair.

Panel shows communication error at startup

Verify MPI or PROFIBUS DP cable connections at both the panel and PLC ends. Check bus termination resistors are correctly placed at both ends of the bus segment.

Replace or reseat the communication cable. Confirm the bus address of the panel and PLC in WinCC flexible match the physical configuration. Ensure the PLC is powered and in RUN mode.

Project download fails from WinCC flexible

Check the MPI adapter or PC adapter connection between the engineering PC and the panel. Verify that the correct communication port and transfer settings are selected in WinCC flexible.

Switch the panel to Transfer mode manually via the Start Center menu. Retry the download with the correct adapter settings. Update panel firmware if a version mismatch is reported.

Keypad buttons are unresponsive or intermittent

Inspect the membrane keypad for physical damage, contamination, or wear. Check the internal ribbon cable connection between the keypad and the main board.

Clean the keypad surface with a dry cloth. If the ribbon cable is loose or damaged, reseat or replace it. If the keypad membrane is worn, the front panel assembly may need replacement.

Panel reboots repeatedly or fails to complete startup

Check for unstable 24 V DC supply voltage or excessive voltage ripple. Inspect the project stored on the panel for corruption by attempting a fresh project download.

Stabilize the power supply and ensure it meets the panel's current requirements. Perform a factory reset and re-download the project. If rebooting continues, the internal hardware may require professional repair.

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