Siemens 6AV6355-1AA47-7EP0 OP 77A

€ 1.722,53

SKU: 6AV6355-1AA47-7EP0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EP0 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 means of monitoring and controlling automated processes. This unit 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, capable of displaying text and simple graphics for process visualization. It communicates via the MPI/PROFIBUS DP interface, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs without additional hardware. The panel includes a membrane keypad with function keys for operator input and supports configuration via Siemens WinCC flexible software. It operates on a 24 V DC supply and is rated IP65 on the front face for protection against dust and water ingress.

The OP 77A is widely used in manufacturing, packaging, and process automation environments where a cost-effective, robust operator interface is required at the machine level. Its compact form factor makes it suitable for installation in control cabinets and machine panels with limited space. The panel is commonly found in applications such as conveyor systems, pumping stations, and general-purpose machine control where basic text-based visualization and operator input are sufficient.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Input Voltage	24 V DC
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)
Configuration Software	WinCC flexible 2005 or higher
Mounting	Panel mounting
Certifications	CE, UL
Series	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 1000: Configuration transfer error — the configuration data could not be transferred to the panel.
Check the communication cable and interface settings. Ensure WinCC flexible project is compatible with the OP 77A firmware version and retry the transfer.
Event ID: 10000: Communication error — the panel cannot establish a connection to the configured PLC.
Verify MPI/PROFIBUS DP address settings on both the panel and PLC. Check cable integrity and bus termination resistors.
Event ID: 10001: Connection to PLC interrupted during runtime.
Check physical connection and cable. Verify PLC is powered and in RUN mode. Check for bus address conflicts on the network.
Event ID: 20000: Tag read error — the panel cannot read a configured process tag from the PLC.
Verify the tag address exists in the PLC program. Check PLC data block and variable addresses match the WinCC flexible configuration.
Event ID: 20001: Tag write error — the panel cannot write a value to the configured PLC tag.
Check that the PLC tag address is writable and not write-protected. Verify address configuration in WinCC flexible project.
Event ID: 40000: System memory low — available panel memory is insufficient for the current project.
Reduce the number of screens, tags, or alarm entries in the WinCC flexible project and retransfer the configuration.
Event ID: 50000: Internal device error — a hardware fault has been detected on the panel.
Perform a panel reset. If the error persists, the panel may require repair or replacement of internal components.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

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 the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later version. Projects are transferred to the panel via the MPI interface or a PC adapter cable.

What is the supply voltage for the 6AV6355-1AA47-7EP0?

The panel operates on a 24 V DC supply voltage.

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

The front face of the OP 77A is rated IP65, providing protection against dust and low-pressure water jets, making it suitable for industrial panel mounting.

Can the OP 77A display graphics or only text?

The OP 77A monochrome LCD can display both text and simple graphics, though it is primarily intended for text-based process visualization given its 160 x 80 pixel resolution.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the panel power connector. Check for blown internal fuse or wiring fault at the terminal block.

Restore correct 24 V DC supply. If supply is confirmed correct and display remains blank, the internal power supply or display backlight may have failed and the unit should be sent for repair.

Panel cannot communicate with the PLC

Check MPI/PROFIBUS DP cable connections and verify the bus address configured on the panel matches the PLC network settings. Use a bus diagnostic tool to check for address conflicts or missing termination.

Correct the MPI/PROFIBUS DP address in the panel configuration. Replace or reseat the communication cable. Ensure bus termination resistors are correctly placed at both ends of the network segment.

Configuration transfer fails from WinCC flexible

Verify the PC adapter cable is correctly connected to the MPI port and that the correct COM port and transfer speed are selected in WinCC flexible transfer settings.

Set the correct baud rate (typically 187.5 kbps for MPI) and COM port in WinCC flexible. Ensure no other software is occupying the COM port. Try a different PC adapter cable if the issue persists.

Function keys do not respond to operator input

Inspect the membrane keypad for physical damage, contamination, or deformation. Check whether the issue is with all keys or specific keys only.

Clean the keypad surface. If specific keys are unresponsive and the panel is otherwise functional, the membrane keypad assembly may need replacement. Contact a repair specialist for keypad replacement.

Alarm messages are not displayed on the panel

Check the WinCC flexible project to confirm alarm tags are correctly configured and linked to the appropriate PLC addresses. Verify PLC communication is active.

Correct alarm tag addresses in the WinCC flexible configuration and retransfer the project. Ensure the PLC program is setting the correct alarm bits and that communication between panel and PLC is established.

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