Siemens 6AV6355-1AA47-7EB0 OP 77A

SKU: 6AV6355-1AA47-7EB0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EB0 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. It is a compact, key-operated panel designed for machine-level human-machine interface applications, providing operators with a straightforward interface for monitoring and controlling automated processes. The OP 77A is part of the SIMATIC HMI Basic Panels generation and is intended for use with Siemens SIMATIC S7 controllers.

The OP 77A features a monochrome LCD display with a resolution of 160 x 80 pixels and a membrane keypad for operator input, eliminating the need for a touchscreen. It supports MPI and PROFIBUS DP communication interfaces for direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel operates on a 24 V DC supply and is configured using WinCC flexible Compact engineering software. It offers a compact form factor with an IP65 protection rating on the front face, making it suitable for panel-mount installations in industrial environments.

The OP 77A is commonly deployed in manufacturing, machine building, and process automation applications where a cost-effective, reliable operator interface is required. It is well suited for small to mid-scale machinery such as packaging equipment, conveyor systems, and production line control panels. Its robust membrane keypad and compact design make it a practical choice for environments where simplicity and durability are prioritized over graphical complexity.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Input Voltage	24 V DC
Power Consumption	Max. 4 W
Communication Interface	MPI, PROFIBUS DP
IP Protection Rating (Front)	IP65
IP Protection 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
Engineering Software	WinCC flexible Compact
Series/Product Family	SIMATIC HMI OP 77A
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Connection to PLC failed or communication error detected on MPI/PROFIBUS interface.
Check MPI/PROFIBUS cable connections and termination resistors. Verify PLC address settings and baud rate configuration in WinCC flexible.
Event ID: 10001: Connection to the configured PLC was interrupted during operation.
Inspect communication cables for damage. Verify PLC is powered and running. Check network topology and bus termination.
Event ID: 20000: Configuration or project data could not be loaded from internal memory.
Re-download the project from WinCC flexible Compact to the panel. Check for memory corruption and perform a factory reset if necessary.
Event ID: 40000: Tag read error — the panel cannot read a configured PLC tag.
Verify the tag address in WinCC flexible matches the actual PLC data block or memory address. Check PLC program is running and the address exists.
Event ID: 40001: Tag write error — the panel cannot write a value to a configured PLC tag.
Check that the target PLC address is not write-protected. Verify the data type configured in WinCC flexible matches the PLC variable type.
Event ID: 70000: System startup error — panel failed to initialize correctly on power-up.
Cycle power to the panel. If the error persists, perform a factory reset via the loader menu and re-download the project.
Event ID: 80000: Internal device error or hardware fault detected.
Note the full event ID and sub-code. Restart the panel. If the fault recurs, the unit may require repair or replacement.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7EB0)?

The OP 77A is compatible with Siemens 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 Compact engineering software. Projects are downloaded to the panel via an MPI or PROFIBUS DP connection.

What is the supply voltage for the 6AV6355-1AA47-7EB0?

The panel requires a 24 V DC power supply. Ensure the supply is within the specified tolerance range to guarantee stable operation.

Does the OP 77A support touchscreen input?

No, the OP 77A uses a membrane keypad for operator input and does not feature a touchscreen. All navigation and data entry is performed via the physical keys.

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

The front face of the OP 77A carries an IP65 protection rating, making it resistant to dust ingress and low-pressure water jets when correctly panel-mounted with the supplied gasket.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Check that the supply is within tolerance and that the connector is fully seated.

Correct any supply voltage issues. If the supply is confirmed good and the display remains blank, the internal power supply or display backlight may have failed and the unit should be sent for repair.

Panel cannot establish communication with the PLC

Verify the MPI or PROFIBUS DP cable is correctly wired and terminated. Check that the bus address configured on the panel matches the project settings and that no address conflicts exist on the network.

Correct cable wiring and termination. Adjust bus addresses in WinCC flexible to eliminate conflicts. Ensure the PLC is in RUN mode and the communication interface is active.

Project download from WinCC flexible fails

Check the PC-to-panel communication cable (PC adapter or MPI cable). Verify the correct communication port and baud rate are selected in WinCC flexible transfer settings.

Replace or reseat the communication cable. Set the panel to transfer mode via the loader menu before initiating the download. Reinstall the PC adapter driver if necessary.

Operator keys are unresponsive or register incorrect inputs

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

Clean the keypad surface with a dry cloth. If individual keys are damaged or non-functional, the membrane keypad assembly requires replacement.

Panel repeatedly restarts or enters an error loop on startup

Attempt to access the loader menu during startup by pressing the appropriate key combination. Check whether a valid project is stored in the panel memory.

Perform a factory reset from the loader menu and re-download a valid project from WinCC flexible Compact. If the restart loop continues without a project loaded, the unit likely has a hardware fault requiring professional repair.

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