Siemens 6AV6355-1AA47-7CE0 OP 77A

€ 560,84

SKU: 6AV6355-1AA47-7CE0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CE0 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for machine-level human-machine interface applications. This compact panel provides a text-based display interface for monitoring and controlling industrial processes. It is part of Siemens' SIMATIC HMI product line, which is widely used in factory automation environments.

The OP 77A features a monochrome LCD display with a fixed number of function keys and membrane keypad for operator input. It supports MPI and PROFIBUS DP communication interfaces, enabling direct integration with SIMATIC S7 PLCs. The panel is configured using WinCC flexible software and supports alarm management, recipe handling, and process value display. It operates on a 24 V DC supply and is designed for panel front mounting with IP65 protection on the front face.

The OP 77A is typically deployed in manufacturing machinery, conveyor systems, packaging equipment, and process automation installations where a cost-effective, robust operator interface is required. Its compact form factor and compatibility with the SIMATIC S7 controller family make it suitable for OEM machine builders and system integrators working in industries such as automotive, food and beverage, and general manufacturing.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input Voltage	24 V DC
Voltage Tolerance	19.2 V DC to 28.8 V DC
Power Consumption	Max. 4.5 W
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)
Mounting	Panel front mounting
Certifications	CE, UL
Configuration Software	WinCC flexible 2005 or later
Series	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Communication error between the operator panel and the connected PLC. The panel cannot establish or maintain a connection.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings and ensure the PLC is in RUN mode.
Event ID: 10001: Connection to the configured PLC has been interrupted during operation.
Inspect communication cables for damage. Verify bus termination and cable shielding. Check PLC status and restart communication if necessary.
Event ID: 20000: Configuration download error. The project data could not be transferred to the panel.
Verify the WinCC flexible project is compiled without errors. Check the transfer cable connection and ensure the panel is in transfer mode.
Event ID: 40000: System memory low. The panel is running low on available memory resources.
Reduce the number of active alarms or recipe entries. Optimize the WinCC flexible project to reduce memory usage and reload the project.
Event ID: 50000: Internal device error detected during self-test at startup.
Perform a factory reset of the panel. If the error persists, the panel may require hardware repair or replacement.
Event ID: 70000: Alarm buffer overflow. The number of pending alarms has exceeded the buffer capacity.
Acknowledge and clear existing alarms. Review the alarm configuration in WinCC flexible to reduce the number of simultaneously active alarms.
Event ID: 30000: Date and time not set or battery-backed clock has lost its settings.
Set the correct date and time via the panel's system settings menu. If the clock repeatedly loses settings, check or replace the internal backup battery.

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 interfaces. It can also communicate with S7-200 via PPI protocol.

What software is required to configure the 6AV6355-1AA47-7CE0?

The panel is configured using Siemens WinCC flexible 2005 or a later version. Projects are compiled and downloaded to the panel via a PC adapter or MPI/PROFIBUS connection.

What is the supply voltage for this operator panel?

The OP 77A requires a 24 V DC supply voltage with an allowable range of 19.2 V DC to 28.8 V DC.

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 suitable for panel mounting in environments where dust and water spray may be present.

Can the OP 77A handle recipe management?

Yes, the OP 77A supports recipe management functionality, allowing operators to store and transfer process parameter sets between the panel and the connected PLC.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Check that the voltage is within the 19.2 V to 28.8 V range. Inspect the power connector for loose or incorrect wiring.

Correct the supply voltage if out of range. Re-seat the power connector and ensure correct polarity. If the display remains blank with correct supply voltage, the panel's internal power supply or display unit may require repair.

Panel cannot communicate with the S7 PLC

Verify the MPI or PROFIBUS DP address configured in the WinCC flexible project matches the panel's set address. Check bus cable connections, termination resistors at both ends of the bus, and cable shielding continuity.

Correct address mismatches in the project configuration and reload the project. Replace damaged cables and ensure proper bus termination. Confirm the PLC is powered and in RUN or STOP mode with the communication interface active.

Project download fails from WinCC flexible

Confirm the panel is set to transfer mode via the Start Center menu. Check the PC adapter cable connection and that the correct communication port and baud rate are selected in WinCC flexible's transfer settings.

Switch the panel to transfer mode, select the correct COM port and transfer speed in WinCC flexible, and retry the download. If using a USB-to-serial adapter, ensure the correct driver is installed.

Alarms are not displayed on the panel

Check the alarm configuration in the WinCC flexible project to confirm alarm triggers are correctly linked to PLC data tags. Verify that the PLC tags are updating correctly and that the alarm view object is present on the relevant screen.

Correct any misconfigured alarm triggers or tag connections in the project and reload it to the panel. Ensure the PLC program is writing the expected values to the alarm trigger bits.

Panel repeatedly loses date and time settings after power off

The internal real-time clock battery may be discharged or missing. Access the panel's system settings to check if the clock resets to a default date after each power cycle.

Replace the internal backup battery with the correct type as specified in the OP 77A operating instructions. After replacement, set the correct date and time in the panel's system settings.

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