Siemens 6AV6355-1AA47-7BD1 OP 77A

€ 1.257,64

SKU: 6AV6355-1AA47-7BD1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7BD1 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for human-machine interface applications in industrial automation environments. This compact panel provides a keypad-based interface for process monitoring and control, and is part of Siemens' established SIMATIC HMI product line. It is intended for use with Siemens SIMATIC S7 and S5 PLCs as well as other compatible controllers via standard communication interfaces.

The OP 77A features a monochrome LCD display with a resolution suitable for displaying text and simple graphics, along with a membrane keypad for operator input. It supports the MPI and PROFIBUS DP communication protocols, enabling direct integration into SIMATIC automation networks. Configuration is performed using Siemens ProTool or WinCC flexible engineering software, and the panel includes internal flash memory for project storage. The unit operates on a 24 V DC supply and is built to withstand typical industrial environmental conditions.

The OP 77A is commonly deployed in machine-level control panels across manufacturing, packaging, and process industries where a cost-effective, robust operator interface is required. Its compact form factor makes it suitable for integration into control cabinets and machine panels with limited space. The keypad-based design is preferred in environments where touchscreen operation is impractical due to gloves, dust, or other conditions.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
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 Protection Rating	IP65 (front panel)
Mounting	Panel mounting
Series/Product Family	SIMATIC HMI OP 77A
Engineering Software	ProTool, WinCC flexible
Memory	Internal flash memory
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Communication error between the OP 77A and the connected PLC or controller. The panel cannot establish or maintain a connection.
Check the MPI or PROFIBUS DP cable connections and termination resistors. Verify the configured station address matches the PLC settings. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the configured PLC address has been lost during operation.
Inspect the communication cable for damage or loose connectors. Verify network termination and bus parameters. Restart the panel and PLC if the connection is not restored automatically.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel successfully.
Check the transfer cable connection between the engineering PC and the panel. Ensure the panel is in transfer mode and that the correct communication port and baud rate are selected in the engineering software.
Event ID: 40000: Internal memory error detected. The panel has encountered a fault with its flash memory or stored project data.
Attempt to re-download the project to the panel. If the error persists, perform a factory reset and re-transfer the project. Replace the panel if the memory fault cannot be cleared.
Event ID: 50000: Operating system or firmware error. The panel firmware may be corrupted or incompatible with the loaded project.
Update the panel firmware to the version compatible with the engineering software used. Re-download the project after the firmware update is complete.
Event ID: 60000: Configuration error. The project loaded on the panel contains settings or objects that are incompatible with the OP 77A hardware.
Review the project in ProTool or WinCC flexible and verify that all configured objects and functions are supported by the OP 77A. Correct any incompatibilities and re-download the project.

Frequently Asked Questions

What communication protocols does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP communication protocols, allowing direct connection to Siemens SIMATIC S7 and S5 PLCs as well as other PROFIBUS-compatible controllers.

What engineering software is required to configure the 6AV6355-1AA47-7BD1?

The OP 77A is configured using Siemens ProTool or WinCC flexible engineering software. The project is then transferred to the panel via a PC adapter cable.

What is the supply voltage for this operator panel?

The 6AV6355-1AA47-7BD1 operates on a 24 V DC supply voltage.

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

The front panel of the OP 77A is rated IP65, providing protection against dust ingress and low-pressure water jets, making it suitable for industrial panel mounting.

Can the OP 77A be used with non-Siemens PLCs?

The OP 77A primarily supports Siemens SIMATIC controllers via MPI and PROFIBUS DP. Connectivity to non-Siemens controllers depends on PROFIBUS DP compatibility and available driver support in the engineering software.

Troubleshooting

Display remains blank after power on

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

Restore the correct 24 V DC supply. If the supply voltage is correct and the display remains blank, inspect the internal fuse and replace if blown. If the fault persists, the panel may require repair or replacement.

Panel displays communication error and cannot connect to PLC

Verify the MPI or PROFIBUS DP cable connections at both the panel and PLC ends. Check the bus termination resistors at both ends of the network segment and confirm the station address configured on the panel matches the PLC address.

Replace or reseat the communication cable. Correct the station address in the panel project if it does not match the PLC. Ensure bus termination is active only at the physical ends of the network segment.

Project cannot be downloaded to the panel from the engineering PC

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

Place the panel in transfer mode before initiating the download. Select the correct communication port and baud rate in the engineering software. Replace the PC adapter cable if communication cannot be established.

Operator keys are unresponsive or produce incorrect input

Inspect the membrane keypad for physical damage, contamination, or deformation. Test each key systematically to identify whether the fault is isolated to specific keys or affects the entire keypad.

Clean the keypad surface with a dry cloth to remove contamination. If individual keys are mechanically damaged or the keypad connector is faulty, the keypad membrane or the panel unit will need to be replaced.

Panel restarts repeatedly or enters a boot loop

Check the 24 V DC supply for voltage drops or instability under load. Verify that the project stored on the panel is compatible with the installed firmware version.

Stabilize the power supply and ensure it is adequately rated for the panel's power consumption. Update the firmware if a version mismatch is detected, then re-download the project. Perform a factory reset if the boot loop continues.

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