Siemens 6AV6355-1AA47-7BD6 OP 77B

€ 1.995,00

SKU: 6AV6355-1AA47-7BD6 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7BD6 is an operator panel belonging to the OP 77B series within the Siemens SIMATIC HMI product family. This compact panel operator unit is designed for machine-level human-machine interface applications, providing a text-based display and membrane keypad for operator interaction with automation systems. It is a robust, panel-mounted device intended for integration into control cabinets and machine fronts.

The OP 77B features a multi-line STN LCD text display capable of showing alphanumeric characters and basic graphics, paired with a membrane keypad for navigation and data entry. It supports communication via MPI and PROFIBUS DP interfaces, enabling direct connection to Siemens S7-200, S7-300, and S7-400 PLCs without an additional communication module. The unit operates on a 24 V DC supply and is configured using Siemens WinCC flexible software, supporting recipe management, alarm logging, and trend display functions within its onboard memory.

The OP 77B is widely deployed in manufacturing, packaging, material handling, and process automation environments where a cost-effective, reliable operator interface is required at the machine level. Its compact form factor and panel-mount design make it suitable for integration into existing control panels with limited space. The device is particularly common in applications where text-based status monitoring, parameter entry, and alarm acknowledgment are the primary operator tasks.

Technical Specifications

Display Type	STN LCD
Display Lines	4 lines of text
Display Characters per Line	20 characters
Input/Operating Voltage	24 V DC
Power Consumption	4.5 W (typical)
Communication Interface	MPI, PROFIBUS DP
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
IP Rating (Front)	IP65
IP Rating (Rear)	IP20
Mounting	Panel mounting
Configuration Software	WinCC flexible 2008 or higher
Series/Product Family	SIMATIC HMI OP 77B
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel 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 settings match the HMI project configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during runtime operation.
Inspect the communication cable for damage or loose connectors. Check bus termination and cable shielding. Restart the HMI panel and verify PLC communication parameters.
Event ID: 20000: Project download error. The configuration project could not be transferred to the HMI device.
Verify the PC-to-HMI connection cable is correctly seated. Ensure WinCC flexible is using the correct transfer settings and COM port. Check that the HMI is in transfer mode before initiating download.
Event ID: 40000: System memory low. The available memory on the HMI device is insufficient for the current project or runtime data.
Reduce the size of the project by limiting the number of screens, alarms, or recipe entries. Delete unused data records from the device memory before reloading the project.
Event ID: 50000: Alarm buffer overflow. The number of pending or unacknowledged alarms has exceeded the buffer capacity.
Acknowledge and clear existing alarms on the panel. Review the alarm configuration in WinCC flexible to reduce the maximum number of simultaneous alarms or increase the buffer size if supported.
Event ID: 60000: Device configuration error. The loaded project is incompatible with the current firmware version of the HMI panel.
Update the HMI firmware to the version required by the project, or recompile the project using a compatible version of WinCC flexible and re-download to the device.
Event ID: 70000: Operating system error or internal device fault detected during startup or runtime.
Perform a power cycle of the HMI panel. If the error persists, perform a factory reset and re-download the project. If the fault continues, the device may require hardware repair or replacement.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B (6AV6355-1AA47-7BD6)?

The OP 77B is compatible with Siemens S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP communication. It can also connect to S7-1200 and S7-1500 controllers in some configurations depending on firmware version.

What software is used to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are compiled in WinCC flexible and downloaded to the panel via a PC adapter or MPI/PROFIBUS connection.

What is the supply voltage for the 6AV6355-1AA47-7BD6?

The device operates on a 24 V DC supply voltage, which is standard for SIMATIC HMI operator panels in this series.

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

Can the OP 77B display graphics or only text?

The OP 77B is primarily a text-based operator panel with a character LCD display. It supports basic alphanumeric characters and limited symbolic representations, but is not designed for full graphical display output.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the power connector using a multimeter. Verify that the supply is within the specified range and that the connector is fully seated.

Restore the correct 24 V DC supply. If the supply is correct and the display remains blank, inspect the internal power supply board for damage. The display backlight or internal fuse may require replacement.

HMI panel shows 'No connection to PLC' message at runtime

Verify the MPI or PROFIBUS DP cable is connected to both the HMI and the PLC. Check the bus address configured in the HMI project matches the PLC station address. Inspect cable termination at both ends of the bus.

Correct any address mismatches in the WinCC flexible project and re-download. Replace damaged cables and ensure proper bus termination resistors are installed at both ends of the PROFIBUS or MPI segment.

Project download fails or transfer does not initiate

Confirm the HMI is set to transfer mode by navigating to the system menu on the panel. Check the PC adapter cable connection and verify the correct COM port and transfer settings are selected in WinCC flexible.

Place the HMI in transfer mode manually via the system menu. Select the correct interface and baud rate in WinCC flexible transfer settings. Replace the PC adapter cable if communication cannot be established.

Keypad buttons do not respond or are intermittent

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

Clean the keypad surface with a dry cloth. If individual keys are unresponsive due to membrane damage, the keypad membrane assembly will need to be replaced as a spare part.

Alarm messages are not displayed or alarms are missing

Check the alarm configuration in the WinCC flexible project to ensure alarm tags are correctly linked to PLC data addresses. Verify the PLC communication is active and the relevant PLC bits are being set correctly.

Correct tag address assignments in the WinCC flexible project and re-download. Confirm the PLC program is writing to the correct alarm trigger bits. Clear the alarm buffer on the HMI if it has reached capacity.

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