Siemens 6AV6355-1AA47-7EM8 OP 77B

€ 1.995,00

SKU: 6AV6355-1AA47-7EM8 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EM8 is an operator panel belonging to the SIMATIC HMI OP 77B series, manufactured by Siemens. It is a compact, key-operated panel designed for machine-level human-machine interface applications, providing operators with a straightforward interface for monitoring and controlling automated processes. The OP 77B series sits within Siemens' broader SIMATIC HMI product line and is intended for use with SIMATIC S7 and other compatible controllers.

The OP 77B features a monochrome LCD display and a membrane keypad for operator input, eliminating the need for a touchscreen while maintaining reliable operation in industrial environments. It supports the MPI and PROFIBUS DP communication interfaces, enabling direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using Siemens WinCC flexible software and supports basic alarm management, recipe handling, and process value display. It operates on a 24 V DC supply and is rated to IP65 at the front panel, providing protection against dust and water ingress.

The OP 77B is commonly deployed in machine building, packaging, material handling, and general factory automation applications where a cost-effective, robust operator interface is required. Its compact form factor and keypad-based operation make it well suited for control cabinets and machine panels where space is limited and touchscreen operation is not necessary. The panel is particularly popular in applications requiring straightforward process monitoring and parameter entry without complex graphical requirements.

Technical Specifications

Series/Product Family	SIMATIC HMI OP 77B
Display Type	Monochrome LCD
Display Size	4 inches
Input/Operating Voltage	24 V DC
Communication Interface	MPI, PROFIBUS DP
IP/Protection Rating	IP65 (front panel)
Operating Temperature	0 °C to 50 °C
Storage Temperature	-20 °C to 60 °C
Relative Humidity	10 % to 90 %, non-condensing
Certifications	CE, UL
Configuration Software	WinCC flexible
Mounting	Panel mounting

Common Error Codes & System Events

Event ID: 10000: Communication error between the OP 77B 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 configured PLC address matches the actual controller address. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Timeout error on the communication link. The panel did not receive a response from the PLC within the expected time window.
Check for cable faults or excessive bus loading. Reduce the number of devices on the bus or check bus cable length against PROFIBUS DP specifications.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel successfully.
Verify the USB or serial connection between the engineering PC and the panel. Ensure WinCC flexible project is compiled without errors before downloading.
Event ID: 40000: Tag acquisition error. One or more configured tags cannot be read from the PLC.
Check that the PLC data blocks and addresses referenced in the WinCC flexible project exist and are accessible. Verify PLC program is running correctly.
Event ID: 50000: System memory low. The panel's available runtime memory is insufficient for the loaded project.
Reduce the number of active alarms, recipes, or screen objects in the project. Simplify the project configuration and re-download.
Event ID: 60000: Alarm buffer overflow. The number of pending alarms has exceeded the panel's alarm buffer capacity.
Acknowledge and clear existing alarms. Review the alarm configuration to reduce unnecessary alarm triggers or increase acknowledgement frequency.
Event ID: 70000: Operating system or firmware error detected during panel startup.
Perform a panel reset by cycling power. If the fault persists, update the panel firmware using the Siemens ProSave tool or contact Siemens technical support.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B?

The OP 77B is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with certain third-party controllers supported by WinCC flexible drivers.

What software is used to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible software. The project is created on an engineering PC and downloaded to the panel via USB or serial connection.

What is the supply voltage for the OP 77B?

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 is rated to IP65, providing protection against dust ingress and low-pressure water jets.

Does the OP 77B support recipe management?

Yes, the OP 77B supports basic recipe management functionality, allowing operators to store and transfer 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 supply is within the specified tolerance and that the connector is fully seated.

Restore the supply voltage to within the 24 V DC specification. If the supply is correct and the display remains blank, the internal power supply or display backlight may have failed and the unit should be sent for repair or replacement.

Panel shows communication error and cannot connect to PLC

Inspect the MPI or PROFIBUS DP cable for physical damage. Verify bus termination is correctly applied at both ends of the bus. Check that the panel's configured station address matches the PLC address.

Replace damaged cables, correct bus termination, and ensure address settings in the WinCC flexible project match the physical network configuration. Cycle power on both the panel and PLC after making changes.

Project download fails from engineering PC

Check the USB or serial cable connection between the PC and the panel. Verify that the panel is in transfer mode and that the correct communication port is selected in WinCC flexible.

Place the panel in transfer mode via the panel's start center menu. Select the correct COM port or USB interface in WinCC flexible and retry the download. Ensure the project compiles without errors before attempting transfer.

Keypad buttons are unresponsive or intermittent

Inspect the membrane keypad for physical damage, contamination, or wear. Check that the keypad connector is properly seated on the internal PCB.

Clean the keypad surface with a dry cloth. If buttons remain unresponsive, the membrane keypad assembly may need to be replaced. Consult the OP 77B service manual for keypad replacement procedures.

Panel repeatedly restarts or fails to boot

Check the 24 V DC supply for voltage fluctuations or insufficient current capacity. Inspect the panel for signs of overheating or environmental contamination.

Ensure the power supply can deliver sufficient current for the panel. Verify the operating environment is within the specified temperature range of 0 °C to 50 °C. If the issue persists, update the panel firmware using Siemens ProSave or arrange for unit inspection and repair.

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