Siemens 6AV6355-1AA47-7EF0 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7EF0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EF0 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 industrial processes. The OP 77A belongs to the SIMATIC HMI Basic Panels generation and is intended for use with Siemens SIMATIC S7 controllers.

The OP 77A features a monochrome STN LCD display with a resolution of 160 x 80 pixels, capable of displaying text and simple graphics. It supports MPI and PROFIBUS DP communication interfaces, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and includes function keys for operator input, with no touchscreen capability. It operates on a 24 V DC supply and is rated to IP65 on the front face for protection against dust and water ingress.

The OP 77A is widely used in machine building, manufacturing automation, and process control environments where a cost-effective, robust operator interface is required. Its compact form factor makes it suitable for integration into control cabinets and machine panels with limited space. Industries such as automotive, food and beverage, packaging, and general manufacturing commonly deploy this panel for local machine control and status monitoring.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Colors	Monochrome (blue/white)
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.5 W
Communication Interface	MPI, PROFIBUS DP
IP/Protection Rating	IP65 (front), IP20 (rear)
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
Mounting	Panel mounting
Series/Product Family	SIMATIC HMI OP 77A
Configuration Software	WinCC flexible 2005 or higher
Certifications	CE, UL, cULus

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 panel configuration in WinCC flexible.
Event ID: 10001: Communication timeout between the HMI panel and the connected controller.
Verify the communication parameters (baud rate, station address) in WinCC flexible match the PLC settings. Check cable integrity and bus termination.
Event ID: 20000: Project download failed or project data on the panel is corrupt.
Re-transfer the project from WinCC flexible to the panel. Ensure the WinCC flexible version is compatible with the panel firmware version.
Event ID: 40000: Panel operating system or firmware error detected during startup.
Perform a firmware update using the ProSave tool or WinCC flexible. If the issue persists, the panel may require service or replacement.
Event ID: 50000: Internal memory error or configuration data could not be loaded correctly.
Reset the panel to factory defaults and re-download the project. Check available memory and reduce project size if necessary.
Event ID: 70000: Tag value exceeds the configured high or low limit defined in the project.
Check the process value and the configured tag limits in WinCC flexible. Adjust limit values or investigate the process for out-of-range conditions.
Event ID: 110000: Recipe data error — recipe record could not be read or written correctly.
Verify recipe configuration in WinCC flexible. Check that the recipe data area in the PLC data block matches the panel configuration.

Frequently Asked Questions

Which PLCs are compatible with the Siemens OP 77A (6AV6355-1AA47-7EF0)?

The OP 77A is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with SIMATIC S7-200 via PPI protocol.

What software is required to configure the OP 77A?

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

Does the OP 77A have a touchscreen?

No, the OP 77A does not have a touchscreen. Operator input is performed exclusively via the integrated function keys and navigation keys on the panel.

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

The front face of the OP 77A is rated to IP65, providing protection against dust ingress and low-pressure water jets. The rear of the unit is rated IP20.

Can the OP 77A display graphics or only text?

The OP 77A can display both text and simple graphics on its monochrome STN LCD. However, its 160 x 80 pixel resolution limits graphical complexity compared to larger HMI panels.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the panel power connector. Check that the voltage is within the acceptable range and that the connector is firmly seated.

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

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

Check the MPI or PROFIBUS DP cable between the panel and the PLC. Verify bus termination at both ends of the cable and confirm station addresses are correctly configured.

Replace or reseat the communication cable. Correct the station address and baud rate settings in WinCC flexible to match the PLC configuration, then re-download the project.

Project download from WinCC flexible fails or is interrupted

Check the PC-to-panel connection cable (MPI or serial). Ensure the panel is in transfer mode and that the correct communication port and baud rate are selected in WinCC flexible.

Switch the panel to transfer mode manually via the panel menu. Use a known-good MPI cable and verify PC COM port settings. Retry the download with WinCC flexible.

Function keys do not respond or produce incorrect actions

Check the project configuration in WinCC flexible to confirm that function key assignments are correctly defined. Inspect the key membrane for physical damage or contamination.

Re-download the project to ensure the latest configuration is loaded. If keys are physically damaged, the panel front membrane or the unit itself will require replacement.

Panel restarts repeatedly or enters a boot loop

This may indicate corrupt firmware or a failed project download. Observe whether the panel reaches the operating system startup screen or fails before that point.

Use the Siemens ProSave tool to perform a firmware recovery or update via the MPI interface. If the panel cannot be recovered via software, it requires hardware service.

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