Siemens 6AV6355-1AA47-7HA0 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7HA0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7HA0 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 provides a robust interface for machine-level operator control and monitoring. It is intended for use with Siemens SIMATIC S7 and other compatible controller families.

The OP 77A features a monochrome LCD display with a resolution of 128 x 64 pixels, offering clear text and simple graphic visualization. It supports key-based operation with dedicated function keys, system keys, and numeric entry keys, making it suitable for straightforward parameter entry and status monitoring. Communication is handled via MPI and PROFIBUS DP interfaces, enabling direct integration into Siemens automation networks. The unit operates on a 24 V DC supply and is built to withstand the demands of industrial environments with a front panel protection rating of IP65.

The OP 77A is commonly deployed in machine building, manufacturing automation, and process control applications where a compact, cost-effective operator interface is required. It is well-suited for controlling conveyor systems, packaging machinery, and general-purpose machine tools where operators need to input parameters and monitor basic process states. Its compatibility with SIMATIC S7-200, S7-300, and S7-400 PLCs makes it a versatile choice across a wide range of industrial installations.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	128 x 64 pixels
Display Size	4 inches (diagonal)
Operation Type	Keypad (membrane keys)
Input Voltage	24 V DC
Voltage Tolerance	19.2 V DC to 28.8 V DC
Power Consumption	Approx. 4 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: Connection to the PLC could not be established or was interrupted during operation.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify PLC address settings match the configuration in WinCC flexible.
Event ID: 10001: Communication timeout: no response received from the configured PLC within the expected time.
Check network cabling, verify PLC is in RUN mode, and confirm baud rate and station address settings on both the OP 77A and PLC.
Event ID: 20000: Configuration data could not be loaded or is missing from the device.
Re-transfer the project from WinCC flexible to the OP 77A using a valid PC-to-panel connection. Verify project compatibility with the panel firmware version.
Event ID: 20001: Firmware version mismatch detected between the loaded project and the panel firmware.
Update the panel firmware to the version required by the WinCC flexible project, or recompile and transfer the project using the matching software version.
Event ID: 40000: Internal device error or hardware fault detected during self-test at startup.
Perform a factory reset and reload the project. If the fault persists, the panel may require repair or replacement.
Event ID: 50000: Tag or variable address in the project references an invalid or inaccessible PLC memory area.
Review the tag configuration in WinCC flexible and verify that all referenced PLC addresses exist and are accessible in the connected controller.
Event ID: 60000: Panel memory is full; no further data logging or alarm buffering is possible.
Clear the alarm buffer and data logs via the panel's service menu, or reduce the number of logged events in the WinCC flexible project configuration.

Frequently Asked Questions

Which PLC families are compatible with the OP 77A (6AV6355-1AA47-7HA0)?

The OP 77A is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It can also communicate with S7-1200 in some configurations using appropriate drivers in WinCC flexible.

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

The OP 77A is configured using Siemens WinCC flexible software. Projects are created on a PC and transferred to the panel via a serial or USB-to-MPI adapter cable.

What is the supply voltage for the 6AV6355-1AA47-7HA0?

The panel requires a 24 V DC supply with an operating range of 19.2 V DC to 28.8 V DC.

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 installation in environments with dust and water spray exposure.

Can the OP 77A display graphics and images?

The OP 77A supports basic graphic elements and text-based screens but is limited by its 128 x 64 pixel monochrome display. It is not suitable for complex graphical visualization; it is intended for text and simple symbol-based operator interfaces.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Check that the voltage is within the 19.2 V to 28.8 V range. Inspect the supply cable and connector for damage.

Restore the supply voltage to within specification. If voltage is correct and display remains blank, the internal power supply or display backlight may have failed, requiring panel repair or replacement.

Panel displays 'No connection to PLC' or connection error at startup

Verify the MPI or PROFIBUS DP cable is correctly connected and terminated at both ends. Check that the PLC station address configured in WinCC flexible matches the actual PLC address setting.

Correct any wiring faults, ensure proper bus termination, and confirm matching station addresses. Re-transfer the project if configuration changes are made.

Project transfer from PC to panel fails

Check the PC-to-panel communication cable (serial or USB-to-MPI adapter). Verify that WinCC flexible is set to the correct transfer mode and COM port. Confirm the panel is in transfer mode.

Place the panel in transfer mode via the Start Center menu, use a known-good transfer cable, and retry the download. Ensure the WinCC flexible version matches the panel firmware version.

Function keys do not respond or produce incorrect actions

Check for physical damage to the membrane keypad. Verify the key assignments in the WinCC flexible project are correctly configured and the project has been successfully transferred to the panel.

If keys are physically damaged, the membrane keypad assembly requires replacement. If the issue is configuration-related, correct the key assignments in WinCC flexible and re-transfer the project.

Panel repeatedly restarts or enters a boot loop

This may indicate corrupted firmware or a failed project transfer. Attempt to access the Start Center during boot by pressing the appropriate key combination. Check for supply voltage instability.

Perform a firmware update or factory reset via the Start Center. Ensure the power supply is stable and within specification before re-transferring the project from WinCC flexible.

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