Siemens 6AV6355-1AA47-7CD0 OP 77A

€ 850,20

SKU: 6AV6355-1AA47-7CD0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CD0 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 product line, which is widely deployed across industrial automation environments worldwide.

The OP 77A features a monochrome LCD display and a membrane keypad with function keys, system keys, and numeric entry capability, enabling structured operator interaction without the complexity of a full touchscreen interface. It supports the MPI and PROFIBUS DP communication protocols, allowing direct integration with Siemens S7-200, S7-300, and S7-400 PLCs. Configuration is performed using WinCC flexible software, and the panel includes onboard flash memory for project storage. The unit operates on a 24 V DC supply and is rated for industrial environments with an IP65 front panel protection rating.

The OP 77A is typically deployed in machine building, manufacturing automation, and process control applications where a cost-effective, robust operator interface is required at the machine level. It is well suited for packaging machinery, conveyor systems, and general-purpose industrial machines where text-based status display and parameter entry are the primary HMI requirements. Its compact form factor and panel-mount design make it appropriate for integration into standard control cabinet doors and machine enclosures.

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 mounting
Certifications	CE, UL, cULus
Configuration Software	WinCC flexible 2005 or higher
Compatible PLCs	SIMATIC S7-200, S7-300, S7-400

Common Error Codes and System Events

Event ID: 10000: Configuration error detected on startup; the loaded project is incompatible or corrupt.
Reload the project using WinCC flexible. Verify the project was compiled for the correct HMI device type before transferring.
Event ID: 10001: No project found in the panel memory; the device has started without a valid configuration.
Transfer a valid compiled project to the panel via MPI or PROFIBUS DP using WinCC flexible.
Event ID: 20000: Communication error with the configured PLC; connection to the controller has been lost.
Check MPI or PROFIBUS DP cabling and termination resistors. Verify the PLC address settings match the project configuration.
Event ID: 20001: PLC is in STOP mode; the controller is not executing the user program.
Switch the PLC to RUN mode. Investigate the cause of the PLC stop condition before resuming operation.
Event ID: 40000: Operator panel internal hardware fault detected.
Cycle power to the panel. If the fault persists, the unit requires inspection and likely repair or replacement of internal components.
Event ID: 50000: Transfer mode active; the panel is waiting for a project download from the configuration PC.
Initiate the project transfer from WinCC flexible, or cycle power to exit transfer mode if no transfer is intended.
Event ID: 60000: Watchdog timeout; the panel firmware has detected an internal processing error.
Perform a power cycle. If the fault recurs, check for firmware version compatibility and consider a firmware update or unit replacement.

Frequently Asked Questions

Which communication protocols does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP communication protocols, enabling direct connection to Siemens S7-200, S7-300, and S7-400 series PLCs.

What software is required to configure the 6AV6355-1AA47-7CD0?

The panel is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are compiled within WinCC flexible and transferred to the panel via MPI or PROFIBUS DP.

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

The front panel of the OP 77A carries an IP65 protection rating, making it suitable for environments where dust and water spray may be present.

What supply voltage does the OP 77A require?

The OP 77A operates on a 24 V DC supply, with an acceptable input range of 19.2 V DC to 28.8 V DC.

Can the OP 77A be used with S7-1200 or S7-1500 PLCs?

The OP 77A is not natively compatible with S7-1200 or S7-1500 PLCs, as these controllers use TIA Portal and are designed to work with newer SIMATIC HMI panels such as the Basic or Comfort series.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Verify the supply is within the 19.2 V to 28.8 V range. Check the supply cable and connector for damage or loose connections.

Restore the supply voltage to within specification. If the supply is correct and the display remains blank, the internal power supply or display backlight may have failed, requiring unit repair or replacement.

Panel shows communication error or cannot connect to PLC

Verify the MPI or PROFIBUS DP cable is correctly connected and terminated at both ends. Check that the bus address configured in the panel project matches the actual PLC address. Confirm the PLC is powered and in RUN mode.

Correct any address mismatches in the WinCC flexible project and retransfer. Replace damaged cables or connectors. Ensure proper bus termination resistors are installed at both ends of the network segment.

Panel enters transfer mode unexpectedly on startup

The panel may have been powered on while a transfer request was active, or a button combination was held during boot. Check whether a PC running WinCC flexible is connected and attempting a transfer.

Disconnect the configuration PC or cancel the transfer in WinCC flexible. Cycle power to the panel to allow it to boot normally into the loaded project.

Function keys do not respond or produce incorrect actions

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

Retransfer the corrected project if key assignments are misconfigured. If the keypad is physically damaged, the membrane keypad assembly requires replacement.

Project transfer fails or times out

Verify the MPI or PROFIBUS DP interface settings on the PC match the panel's configured bus address and baud rate. Check the PC interface adapter (e.g., PC Adapter USB) is correctly installed and recognized by WinCC flexible.

Correct the interface settings in WinCC flexible and retry the transfer. Replace the interface cable or adapter if communication cannot be established. Ensure the panel is in transfer mode before initiating the download.

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