Siemens 6AV6355-1AA47-7EJ0 OP 77A

€ 386,38

SKU: 6AV6355-1AA47-7EJ0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EJ0 is an Operator Panel (OP 77A) belonging to the SIMATIC HMI Basic Panels product family. This compact operator panel is designed for straightforward human-machine interface tasks, providing a monochrome display and membrane keypad for machine-level operation and monitoring. It is manufactured by Siemens as part of the SIMATIC HMI portfolio, intended for integration into control panels and machinery.

The OP 77A features a monochrome STN LCD display with a resolution of 160 x 80 pixels and a membrane keypad with function keys for direct operator interaction. It supports MPI and PROFIBUS DP communication interfaces, enabling seamless integration with SIMATIC S7 PLCs. The panel is configured using WinCC flexible software and offers sufficient tag memory for basic HMI applications. The unit operates on 24 V DC supply and is rated IP65 at the front panel for protection against dust and water ingress.

The OP 77A is typically deployed in manufacturing and process automation environments where a cost-effective, reliable operator interface is required at the machine level. It is well suited for applications in packaging machinery, conveyor systems, and general-purpose machine tools where operators need to monitor process values and trigger control commands. Its compact form factor and robust construction make it appropriate for installation in confined control cabinet cutouts across a wide range of industrial sectors.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Keypad	Membrane keypad with function keys
Input Voltage	24 V DC
Voltage Tolerance	19.2 V DC to 28.8 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
Mounting	Panel mounting
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Communication error between the OP 77A and the connected PLC. The panel cannot establish or maintain a connection to the configured controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration in WinCC flexible.
Event ID: 10001: Connection to PLC interrupted during runtime. The panel has lost communication with the configured S7 controller.
Inspect the communication cable for damage or loose connectors. Confirm the PLC is powered and in RUN mode. Restart the panel if the connection is not re-established automatically.
Event ID: 20000: Configuration download error. The project could not be transferred to the panel successfully.
Verify the transfer cable and PC interface settings. Ensure WinCC flexible project is compatible with the OP 77A firmware version. Retry the download after restarting both the panel and the configuration PC.
Event ID: 20001: Firmware version mismatch. The loaded project was created for a different firmware version than installed on the device.
Update the panel firmware to the version required by the WinCC flexible project, or recompile the project targeting the installed firmware version.
Event ID: 40000: Internal device error. A hardware fault has been detected within the operator panel.
Perform a power cycle on the panel. If the error persists, note the event details and contact Siemens technical support or arrange for device repair or replacement.
Event ID: 50000: Tag read/write error. The panel was unable to read from or write to a configured PLC tag.
Verify the tag address is correct and accessible in the PLC program. Check that the PLC data block or memory area referenced by the tag exists and is not write-protected.
Event ID: 60000: System memory low. The panel's available runtime memory is insufficient for the loaded project.
Reduce the number of active screens, alarms, or tags in the WinCC flexible project. Optimize the project to reduce memory usage and reload the configuration.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7EJ0)?

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

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible software. The project is then transferred to the panel via a PC adapter cable connected to the MPI or PROFIBUS DP port.

What is the supply voltage for the 6AV6355-1AA47-7EJ0?

The panel requires a 24 V DC supply voltage with an acceptable 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 is rated IP65, providing protection against dust ingress and low-pressure water jets.

Can the OP 77A display graphics or only text?

The OP 77A supports basic graphical elements on its monochrome STN LCD display, including bar graphs and simple symbols, in addition to text-based process value displays.

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 19.2 V to 28.8 V range. Inspect the internal fuse if accessible.

Restore the correct supply voltage if out of range. Replace any blown fuse with the correct rating. If the display remains blank with correct supply voltage, the internal power supply or display unit may require replacement.

Panel cannot communicate with the PLC

Check the MPI or PROFIBUS DP cable connections at both the panel and PLC ends. Verify bus termination is correctly applied at both ends of the network. Confirm that the PLC address and baud rate configured in WinCC flexible match the actual PLC settings.

Replace or reseat the communication cable. Correct any address or baud rate mismatches in the WinCC flexible project and re-download the configuration. Ensure only the two physical end nodes on the bus have termination resistors enabled.

Project download fails or transfer is not possible

Verify the PC adapter cable is correctly connected to the panel's MPI port and the PC's USB or serial port. Check that the panel is in transfer mode and that the correct COM port and baud rate are selected in WinCC flexible.

Set the panel to transfer mode via the Start Center menu. Select the correct interface and baud rate in WinCC flexible transfer settings. Try a different USB port or PC adapter cable if the issue persists.

Function keys do not respond or respond incorrectly

Inspect the membrane keypad surface for physical damage, contamination, or deformation. Test each key systematically in a diagnostic or test screen if available in the project.

Clean the keypad surface with a dry cloth. If keys are physically damaged or the membrane is torn, the keypad membrane assembly requires replacement. Contact a qualified repair technician for membrane keypad replacement.

Alarm messages are not displayed or are missing

Check the alarm configuration in the WinCC flexible project to confirm alarm tags are correctly mapped to PLC addresses. Verify the PLC program is setting the correct alarm bits and that communication is active.

Correct any tag address mismatches in the alarm configuration and re-download the project. Confirm the PLC logic is functioning as intended by monitoring the relevant data addresses in the PLC programming software.

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