Siemens 6AV6355-1AA47-7DL1 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7DL1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7DL1 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 operator unit is part of Siemens' SIMATIC HMI product line and provides a reliable interface for machine monitoring and control. It is intended for use with SIMATIC S7 and other compatible Siemens controller families.

The OP 77A features a monochrome LCD display with a membrane keypad for operator input, providing a robust and straightforward interface without touchscreen complexity. It supports MPI and PROFIBUS DP communication interfaces, enabling direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. The unit operates on 24 V DC supply voltage and is built to withstand typical industrial environmental conditions, including resistance to vibration and electromagnetic interference. Configuration is performed using WinCC flexible software.

The OP 77A is commonly deployed in machine building, manufacturing automation, and process control applications where a compact, cost-effective operator interface is required. It is well-suited for panel mounting in control cabinets and machine enclosures where space is limited. Industries such as automotive manufacturing, food and beverage processing, and general factory automation frequently utilize this type of operator panel for local machine control and status display.

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 (Front)	IP65
IP Protection Rating (Rear)	IP20
Mounting	Panel mounting
Configuration Software	WinCC flexible 2008
Series/Product Family	SIMATIC HMI OP 77A
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Communication error between the operator panel and the connected PLC. The connection to the configured controller cannot be established or has been lost.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings and ensure the PLC is powered and running. Check the configured communication parameters in WinCC flexible.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect the communication cable for damage or loose connectors. Verify PROFIBUS DP or MPI network integrity and check for address conflicts on the network.
Event ID: 20000: Project download error. The project could not be transferred to the operator panel.
Verify the transfer cable connection between the PC and the OP 77A. Ensure the panel is set to transfer mode and that the correct COM port or USB adapter is selected in WinCC flexible.
Event ID: 40000: System memory low. Insufficient memory available to execute the current project.
Reduce the size of the project by removing unused screens, tags, or alarm entries. Reload the optimized project to the panel.
Event ID: 50000: Alarm buffer overflow. The number of pending alarms has exceeded the buffer capacity.
Acknowledge and clear existing alarms. Review the alarm configuration in WinCC flexible to reduce the number of simultaneously active alarms.
Event ID: 70000: Operating system error or internal panel fault detected.
Perform a panel restart by cycling the 24 V DC supply. If the fault persists, perform a factory reset and reload the project. If the issue continues, the panel may require hardware repair or replacement.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

The OP 77A supports communication with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It is also compatible with certain SIMATIC S5 controllers using appropriate protocol settings.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2008 software. Projects are created on a PC and downloaded to the panel via a PC/PPI cable or MPI adapter.

What is the supply voltage for the 6AV6355-1AA47-7DL1?

The panel operates on a 24 V DC supply voltage. Ensure the power supply is within the specified tolerance range to ensure reliable operation.

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

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

Can the OP 77A display graphical content?

The OP 77A uses a character-based monochrome LCD display and does not support graphical or bitmap content. It is designed for text-based status display, alarm messages, and simple parameter entry.

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 acceptable voltage range and that the connector is fully seated.

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

Panel shows communication error on startup

Verify the MPI or PROFIBUS DP cable is correctly connected and that termination resistors are properly placed at both ends of the network. Check that the PLC is powered on and that the network addresses configured in the project match the physical device addresses.

Correct any wiring faults, replace damaged cables, and ensure network termination is correct. Update the project in WinCC flexible to match the actual PLC address and re-download the project to the panel.

Project download fails from WinCC flexible

Confirm the panel is in transfer mode by navigating to the transfer settings on the panel. Check the PC-to-panel cable connection and verify the correct communication port is selected in WinCC flexible transfer settings.

Set the panel to transfer mode, reconnect the transfer cable, and retry the download. If using a USB-to-serial adapter, ensure the correct driver is installed and the COM port is recognized by the PC.

Operator keys are unresponsive

Check whether the panel is in a locked or protected operating mode. Inspect the membrane keypad for physical damage, contamination, or deformation that may prevent key actuation.

Disable any configured key lock in the project settings. If the keypad is physically damaged, the membrane keypad assembly will need to be replaced. Clean the keypad surface if contamination is suspected.

Alarm messages are not displayed correctly

Review the alarm configuration in WinCC flexible to ensure alarm tags are correctly linked to PLC data addresses. Verify that the PLC program is writing the correct bit values to trigger the configured alarms.

Correct any misconfigured alarm tag addresses in WinCC flexible and re-download the project. Verify PLC logic is functioning as intended using the PLC programming software online monitoring function.

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