Siemens 6AV6355-1AA47-7BB4 OP 77B

€ 2.495,00

SKU: 6AV6355-1AA47-7BB4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7BB4 is an operator panel belonging to the OP 77B series, part of the SIMATIC HMI product line from Siemens. This compact panel operator unit is designed for machine-level human-machine interface tasks, providing a text-based display for process visualization and operator control. It is a member of the Micro Panel family, intended for straightforward monitoring and control applications in industrial environments.

The OP 77B features a monochrome LCD display capable of showing text and simple graphics, with a membrane keypad for operator input. It supports the MPI and PROFIBUS DP communication interfaces, enabling direct integration with SIMATIC S7 PLCs. The panel includes configurable function keys, an integrated real-time clock, and is configured using Siemens WinCC flexible software. It operates on a 24 V DC supply and is built to withstand typical industrial environmental conditions.

The OP 77B is widely used in manufacturing, packaging, and process automation applications where a cost-effective, reliable operator interface is required at the machine level. It is suitable for integration into control cabinets and machine panels, particularly in applications where text-based status display and simple parameter entry are sufficient. Industries such as food and beverage, automotive assembly, and general machine building commonly deploy this panel for local operator interaction with SIMATIC S7-based control systems.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input Voltage	24 V DC
Voltage Range	19.2 V DC – 28.8 V DC
Communication Interface	MPI, PROFIBUS DP
Configuration Software	WinCC flexible Micro
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
Certifications	CE, UL, cULus
Series	SIMATIC HMI OP 77B

Common Error Codes and 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 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 communication cables for damage or loose connectors. Check bus termination and cable shielding. Restart the panel and PLC if the connection is not automatically re-established.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel successfully.
Verify the PC-to-panel connection (PC/PPI cable or MPI adapter). Ensure the correct COM port and transfer settings are selected in WinCC flexible. Retry the download after restarting the panel in transfer mode.
Event ID: 40000: System memory error detected on the HMI panel.
Perform a factory reset of the panel and re-download the project. If the error persists, the internal flash memory may be faulty and the unit should be sent for repair or replacement.
Event ID: 50000: Illegal tag value detected. A process tag has received a value outside its configured limits.
Check the PLC data block or variable address mapped to the affected tag. Verify data type consistency between the PLC variable and the HMI tag configuration in WinCC flexible.
Event ID: 70000: Recipe data error. A recipe record could not be read from or written to the PLC correctly.
Verify the recipe configuration in WinCC flexible, including data block addresses and data types. Ensure the PLC program is not simultaneously accessing the same data block during the recipe transfer.
Event ID: 80000: Operator control and monitoring system (OCMS) configuration mismatch. The loaded project does not match the connected hardware.
Re-download the correct project version from WinCC flexible that matches the OP 77B hardware configuration. Check the panel type selected during project creation.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B panel?

The OP 77B is designed primarily for use 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 Siemens 6AV6355-1AA47-7BB4?

The panel is configured using Siemens WinCC flexible Micro or WinCC flexible Standard engineering software. Projects are downloaded to the panel via an MPI adapter or PC/PPI cable.

What is the supply voltage for the OP 77B?

The OP 77B requires a 24 V DC supply voltage, with an acceptable operating range of 19.2 V DC to 28.8 V DC.

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 text display, function key labels, and simple status indicators, but is not designed for bitmap graphics or complex visualizations.

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

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 supply cable and connector for damage.

Correct the supply voltage if it is out of range. Replace the power supply cable or connector if damaged. If the supply is correct and the display remains blank, the internal power supply or LCD backlight of the panel may be faulty and require repair or unit replacement.

Panel displays 'Connecting…' and cannot establish communication with the PLC

Verify the MPI or PROFIBUS DP address configured in the HMI project matches the address set on the PLC. Check the communication cable for continuity and correct pin assignment. Confirm bus termination resistors are correctly placed at both ends of the bus.

Correct any address mismatches in the WinCC flexible project and re-download. Replace the communication cable if continuity tests fail. Ensure only the two physical end nodes on the bus have termination resistors enabled.

Project download from PC to panel fails or times out

Check the PC-to-panel interface cable (PC/PPI or MPI adapter). Confirm the panel is in transfer mode by navigating to the transfer menu on the panel. Verify the correct COM port and baud rate are selected in WinCC flexible transfer settings.

Place the panel in transfer mode manually before initiating the download. Try a different USB or serial adapter if the current one is not recognized. Reinstall the WinCC flexible communication drivers on the PC if the connection cannot be established.

Function keys do not respond to operator input

Check whether the panel is in runtime mode and the project is loaded correctly. Inspect the membrane keypad for physical damage or contamination around the key area. Verify that the function keys are correctly configured and assigned in the WinCC flexible project.

Re-download the project to ensure the latest configuration is active. Clean the keypad surface carefully. If specific keys are unresponsive due to membrane damage, the keypad membrane or the entire panel front unit may need to be replaced.

Real-time clock shows incorrect time after power loss

The OP 77B uses an internal battery to maintain the real-time clock during power-off periods. If the clock resets after power loss, the internal backup battery may be discharged or missing.

Replace the internal backup battery with the correct type as specified in the Siemens OP 77B operating instructions. After replacement, reset the time and date via the panel's system menu or through the WinCC flexible project.

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