Siemens 6AV6355-1AA47-7EA0 OP 77A

€ 1.141,69

SKU: 6AV6355-1AA47-7EA0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EA0 is an operator panel (OP 77A) belonging to the SIMATIC HMI Basic Panels product family. It is a compact, key-operated human-machine interface designed for straightforward machine-level visualization and operator control tasks. This unit is part of Siemens' established SIMATIC HMI portfolio and is configured and programmed using WinCC flexible software.

The OP 77A features a monochrome STN LCD display with a resolution of 160 x 80 pixels, providing clear text and simple graphic representation. It supports MPI and PROFIBUS DP communication interfaces, enabling direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel includes function keys with LED indicators, a numeric keypad, and onboard flash memory for project storage. Operating voltage is 24 V DC, and the unit 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 and keypad-based operation make it suitable for installations where touchscreen interfaces are not practical, such as in environments with heavy glove use or high vibration. The panel is commonly found on standalone machines, conveyor systems, and small-scale process control stations.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Colors	Monochrome (blue/white)
Input/Operating Voltage	24 V DC
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
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC. The connection to the controller has been interrupted or cannot be established.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the HMI project configuration. Restart both the panel and the PLC.
Event ID: 10001: Timeout error on the communication link. The PLC did not respond within the expected time window.
Check network cable integrity and connector seating. Verify baud rate and bus parameters are consistent across all nodes. Reduce bus length or check for cable shielding issues.
Event ID: 20000: Project download error. The project could not be transferred to the panel successfully.
Verify the PC-to-panel connection cable is functional. Ensure the WinCC flexible project is compiled without errors before transfer. Check available flash memory on the panel.
Event ID: 40000: System memory low. The panel's available runtime memory is insufficient to execute the current project.
Reduce the number of active screens, variables, or alarms in the project. Recompile and re-download the project using WinCC flexible.
Event ID: 50000: Illegal tag value detected. A process variable has received a value outside its configured limits.
Check the PLC program for incorrect data being written to the tag. Verify tag data type and address mapping in the WinCC flexible project.
Event ID: 70000: Hardware fault detected on the panel. An internal self-diagnostic check has failed.
Perform a panel reset by cycling power. If the fault persists, the panel may require repair or replacement of internal components.
Event ID: 60000: Configuration error. The loaded project is incompatible with the current panel firmware version.
Update the panel firmware to match the version required by the WinCC flexible project, or recompile the project targeting the installed firmware version.

Frequently Asked Questions

Which communication interfaces does the OP 77A (6AV6355-1AA47-7EA0) support?

The OP 77A supports MPI and PROFIBUS DP interfaces, allowing direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs without requiring an additional communications module.

What software is used to configure and program this panel?

The OP 77A is configured using Siemens WinCC flexible 2005 or later versions. Projects are compiled on a PC and downloaded to the panel via a PC/PPI or MPI cable.

What is the supply voltage for the 6AV6355-1AA47-7EA0?

The panel operates on 24 V DC. Ensure the power supply is within the specified tolerance range to avoid panel faults or damage.

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

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

Can the OP 77A be used with third-party PLCs?

The OP 77A is primarily designed for use with Siemens SIMATIC S7 PLCs via MPI or PROFIBUS DP. Communication with third-party controllers may be possible via PROFIBUS DP if the controller supports the protocol, but this requires careful configuration and is not officially supported for all vendors.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel power connector. Check for correct polarity. Inspect the internal fuse if accessible.

Correct any wiring errors or supply voltage issues. If the supply is confirmed good and the display remains blank, the panel backlight or internal power supply board may require replacement.

Panel displays 'No connection to PLC' or communication error message

Check the MPI or PROFIBUS DP cable for physical damage, loose connectors, and correct bus termination at both ends of the network. Verify the PLC station address and baud rate match the HMI project settings.

Replace or reseat the communication cable. Correct address and baud rate mismatches in the WinCC flexible project and re-download. Ensure bus termination resistors are enabled only at the two physical ends of the bus.

Project download fails or transfer is interrupted

Verify the PC-to-panel cable type is correct for the interface being used (MPI or USB-to-MPI adapter). Check that the panel is in transfer mode and that WinCC flexible is targeting the correct panel type and firmware version.

Place the panel in transfer mode manually via the Start Center menu. Use a known-good cable and adapter. Recompile the project in WinCC flexible and retry the download.

Function keys do not respond or produce incorrect actions

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

Correct any incorrect key assignments in the project and re-download. If keys are physically damaged or unresponsive due to membrane wear, the keypad membrane assembly requires replacement.

Panel repeatedly restarts or enters a boot loop

This may indicate a corrupted project file in flash memory or a firmware issue. Attempt to access the Start Center during boot by pressing the appropriate key combination.

Perform a factory reset via the Start Center if accessible. Re-download a freshly compiled project from WinCC flexible. If the issue persists, the panel firmware may need to be reflashed using the Siemens ProSave tool.

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