Siemens 6AV6355-1AA47-7DM0 OP 77A

€ 1.257,64

SKU: 6AV6355-1AA47-7DM0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7DM0 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 provides a keypad-based interface for machine monitoring and control, and is part of Siemens' SIMATIC HMI product line. It is intended for use with Siemens SIMATIC S7 and other compatible PLC families, enabling operators to visualize process data and interact with control systems.

The OP 77A features a monochrome LCD display with a resolution of 160 x 80 pixels, providing clear readout of process values, alarms, and status messages. It supports communication via MPI and PROFIBUS DP interfaces, allowing direct integration into existing Siemens automation networks. The panel includes function keys and system keys for navigation and control, and is configured using Siemens WinCC flexible or STEP 7 Micro/WIN engineering software. The unit operates on a 24 V DC supply and is rated to IP65 on the front face, making it suitable for panel-mount installations in industrial enclosures.

The OP 77A is commonly used in machine building, manufacturing automation, and process control applications where a cost-effective, robust operator interface is required. It is well suited for small to mid-scale machinery such as conveyor systems, packaging machines, and production equipment where basic HMI functionality including alarm display, parameter entry, and status monitoring is needed. Its compact form factor and keypad-based design make it appropriate for environments where touchscreen operation is not practical.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Input Voltage	24 V DC
Voltage Tolerance	19.2 V DC to 28.8 V DC
Power Consumption	Approx. 3 W
Communication Interface	MPI, PROFIBUS DP
IP Rating (Front)	IP65
IP 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
Series	SIMATIC HMI OP 77A

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 to the controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the configured PLC has been lost during operation.
Inspect the communication cable for damage or loose connectors. Verify network topology and bus termination. Restart both the panel and PLC if the connection is not restored automatically.
Event ID: 20000: Configuration error detected. The project loaded on the panel is incompatible or corrupt.
Re-download the project from WinCC flexible or STEP 7 Micro/WIN to the panel. Verify the project was compiled without errors before transfer.
Event ID: 40000: Operating system error or internal firmware fault detected on the panel.
Perform a panel reset. If the fault persists, update the panel firmware using the appropriate Siemens ProSave tool or return the unit for service.
Event ID: 50000: Power supply voltage is outside the permissible range (below 19.2 V DC or above 28.8 V DC).
Measure the 24 V DC supply at the panel power connector. Ensure the power supply unit is functioning correctly and within specification. Check wiring for voltage drop.
Event ID: 60000: Memory error detected. The panel's internal memory may be corrupted or a project transfer was interrupted.
Re-transfer the project to the panel. If the error persists, perform a factory reset using the panel's Start Center and reload the project.

Frequently Asked Questions

What communication interfaces does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP communication interfaces, enabling direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs as well as other PROFIBUS-compatible controllers.

What software is used to configure the Siemens 6AV6355-1AA47-7DM0?

The OP 77A is configured using Siemens WinCC flexible Compact or Standard edition. For S7-200 applications, STEP 7 Micro/WIN with the OP Wizard add-on can also be used.

What is the supply voltage for this panel?

The panel operates on a 24 V DC supply with a permissible range of 19.2 V DC to 28.8 V DC.

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

The front face of the OP 77A is rated to IP65, making it resistant to dust ingress and low-pressure water jets, suitable for panel-mount installations in industrial environments.

Can the OP 77A be used as a replacement for older Siemens OP7 or OP17 panels?

The OP 77A is designed as a successor to older SIMATIC HMI operator panels such as the OP7 and OP17. Migration is possible using WinCC flexible, though project conversion and hardware configuration adjustments may be required.

Troubleshooting

Display remains blank after power on

Check that 24 V DC is present at the power supply terminals of the panel using a multimeter. Verify the power connector is fully seated.

Ensure the supply voltage is within the 19.2–28.8 V DC range. If voltage is correct and the display remains blank, the internal power supply or backlight may be faulty and the unit should be inspected or repaired.

Panel displays 'No connection to PLC' or communication error on startup

Verify the MPI or PROFIBUS DP cable is connected and undamaged. Check that bus termination is correctly applied at both ends of the network. Confirm the PLC address and baud rate in the panel project match the actual PLC settings.

Correct any address or baud rate mismatches in the WinCC flexible project and re-download. Replace the communication cable if damaged. Ensure proper bus termination resistors are installed.

Panel freezes or becomes unresponsive during operation

Determine whether the freeze is reproducible under specific conditions, such as alarm bursts or communication loss. Check for power supply fluctuations.

Perform a panel reset by cycling power. If the issue recurs, update the panel firmware using Siemens ProSave. Review the project for excessive alarm or tag polling loads that may overwhelm the panel processor.

Project transfer from PC to panel fails

Check the PC-to-panel communication cable (typically a PC/MPI adapter or USB-MPI adapter). Verify the correct COM port and transfer settings are selected in WinCC flexible.

Ensure the panel is in transfer mode via the Start Center. Use a known-good Siemens PC/MPI or USB-MPI adapter. Reinstall the adapter drivers on the PC if communication cannot be established.

Keys on the panel do not respond or register incorrect inputs

Inspect the keypad membrane for physical damage, contamination, or wear. Test each key systematically using the panel's built-in key test function in the Start Center.

Clean the keypad surface with a dry cloth. If individual keys are non-functional, the keypad membrane assembly may need replacement. Contact a qualified repair facility for membrane replacement.

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