Siemens 6AV6355-1AA47-7ER2 OP 77B

SKU: 6AV6355-1AA47-7ER2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7ER2 is an operator panel belonging to the OP 77B series within Siemens' SIMATIC HMI product line. This compact panel operator unit is designed for human-machine interface applications, providing a keypad-based interface for machine monitoring and control. It is part of the SIMATIC HMI Basic Panels family, intended for straightforward visualization and operator input tasks in industrial environments.

The OP 77B features a monochrome STN display and a membrane keypad with function keys, system keys, and numeric/alphanumeric input capability. It supports MPI and PROFIBUS DP communication interfaces, enabling direct integration with Siemens S7-200, S7-300, and S7-400 PLCs. The unit operates on 24 V DC supply and is configured using Siemens WinCC flexible software. It offers a compact, panel-mount form factor with an IP65 front protection rating, making it suitable for use in industrial enclosures.

The OP 77B is widely used in manufacturing, machine building, and process automation applications where a cost-effective, reliable operator interface is required. It is commonly found on standalone machines such as packaging equipment, conveyor systems, and injection molding machines. Its compatibility with the SIMATIC S7 controller family makes it a practical choice for system integrators working within the Siemens automation ecosystem.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	4 W (typical)
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
Configuration Software	WinCC flexible 2008 or higher
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Certifications	CE, UL, cULus

Common Error Codes and System Events

Event ID: 10000: Configuration error — the project loaded on the panel is incompatible with the connected PLC or contains invalid configuration data.
Reload the correct project using WinCC flexible. Verify PLC type and communication settings match the panel configuration.
Event ID: 10001: Communication error — the panel cannot establish a connection to the configured PLC.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel project.
Event ID: 10002: Tag read error — the panel is unable to read a configured tag from the PLC.
Verify the tag address exists in the PLC program and that the data type matches the HMI configuration. Check PLC is in RUN mode.
Event ID: 10003: Tag write error — the panel is unable to write a value to a configured PLC tag.
Check that the PLC memory area is not write-protected. Verify the tag address and data type in the WinCC flexible project.
Event ID: 10006: Illegal tag value — a tag value received from the PLC is outside the configured limit range.
Check the PLC program for out-of-range values. Adjust the configured tag limits in WinCC flexible if necessary.
Event ID: 40000: System error — internal panel firmware or runtime error detected.
Perform a panel restart. If the error persists, reload the firmware using the Siemens ProSave tool or replace the unit.
Event ID: 20000: Project transfer error — a project download to the panel was interrupted or failed.
Check the transfer cable or network connection. Ensure WinCC flexible version is compatible with the panel firmware version and retry the transfer.

Frequently Asked Questions

Which communication interfaces does the OP 77B support?

The OP 77B supports MPI and PROFIBUS DP interfaces, allowing direct connection to Siemens S7-200, S7-300, and S7-400 PLCs without an additional communication module.

What software is used to configure the Siemens 6AV6355-1AA47-7ER2?

The panel is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are downloaded to the panel via MPI cable or PROFIBUS connection.

What is the supply voltage for this operator panel?

The OP 77B operates on a 24 V DC supply voltage.

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

The front panel of the OP 77B carries an IP65 protection rating, making it resistant to dust ingress and low-pressure water jets, suitable for industrial enclosure mounting.

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

The OP 77B is not natively compatible with S7-1200 or S7-1500 PLCs, as it uses WinCC flexible which does not support TIA Portal-based controllers. It is designed for use with S7-200, S7-300, and S7-400 series PLCs.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel power connector. Verify polarity and measure actual voltage under load.

Ensure the supply voltage is within the specified 24 V DC range. Replace the power supply if voltage is absent or out of tolerance. If supply is correct, the internal power board may be faulty and the unit may require repair or replacement.

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

Inspect the MPI or PROFIBUS DP cable for damage, loose connectors, or missing bus termination. Verify the PLC address and baud rate configured in the WinCC flexible project match the actual PLC settings.

Replace or reseat the communication cable. Ensure bus termination resistors are correctly placed at both ends of the PROFIBUS segment. Correct any address or baud rate mismatches in the project and reload it to the panel.

Keypad buttons are unresponsive or intermittently fail

Inspect the membrane keypad for physical damage, contamination, or wear. Check the internal ribbon cable connection between the keypad membrane and the main board.

Clean the keypad surface with a dry cloth. If individual keys are permanently unresponsive, the membrane keypad assembly requires replacement. Reseat the ribbon cable connector if accessible during repair.

Project transfer fails or panel is not detected by WinCC flexible

Verify the MPI cable is correctly connected and the PC adapter (e.g., PC Adapter USB) is properly installed with correct drivers. Check that the panel is in transfer mode.

Place the panel in transfer mode via the panel's start center or loader menu. Reinstall the PC adapter drivers if the device is not recognized. Ensure the WinCC flexible project communication settings match the panel's MPI address and baud rate.

Panel displays garbled characters or incorrect screen content

This may indicate a corrupted project file on the panel or a firmware mismatch between the loaded project and the panel runtime version.

Re-download the correct project from WinCC flexible. If the issue persists, update the panel firmware using Siemens ProSave to match the version required by the project, then reload the project.

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