Siemens 6AV6355-1AA47-7EA4 OP 77A

€ 1.107,64

SKU: 6AV6355-1AA47-7EA4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EA4 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 machine monitoring and control, and is part of Siemens' established SIMATIC HMI product line. It is intended for use with Siemens SIMATIC S7 PLCs and other compatible controllers via standard communication interfaces.

The OP 77A features a monochrome LCD display with a resolution suitable for displaying process values, alarms, and status messages. It supports MPI and PROFIBUS DP communication protocols, enabling direct integration into existing Siemens automation networks. The panel is configured using Siemens WinCC flexible engineering software and supports recipe management, alarm logging, and multilingual text display. Its robust housing is rated for panel mounting and is designed to withstand typical industrial environmental conditions.

The OP 77A is commonly deployed in machine building, manufacturing automation, and process control applications where a cost-effective, keypad-operated HMI is required. It is well suited for applications such as packaging machinery, conveyor systems, and general-purpose machine control where touchscreen functionality is not required. The panel's compatibility with the SIMATIC S7 controller family makes it a practical choice for facilities already operating within the Siemens automation ecosystem.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 inches
Communication Interface	MPI, PROFIBUS DP
Input Voltage	24 V DC
Power Consumption	Max. 5 W
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
Mounting	Panel mounting
Engineering Software	WinCC flexible 2005 or higher
Series	SIMATIC HMI OP 77A

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 controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the HMI project configuration. Restart both the panel and the PLC.
Event ID: 10001: Connection to the configured PLC has been lost during operation.
Inspect the communication cable for damage or loose connectors. Verify bus termination and cable shielding. Check PLC operating state and re-establish communication.
Event ID: 20000: Project download error. The HMI panel was unable to receive or store the project data transferred from the engineering PC.
Verify the transfer cable and PC interface settings. Ensure sufficient memory is available on the panel. Retry the project transfer using WinCC flexible.
Event ID: 40000: 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 in WinCC flexible to reduce unnecessary alarm triggers or increase the buffer size if supported.
Event ID: 50000: Recipe data error. A fault has occurred during reading or writing of recipe data.
Check the recipe configuration in WinCC flexible. Verify that the PLC data blocks referenced by the recipes are correctly defined and accessible.
Event ID: 70000: System memory low. The panel's available memory for runtime operation is critically low.
Reduce the project size by removing unused screens, tags, or alarm entries. Re-download the optimized project to the panel.
Event ID: 80000: Operating system error or internal panel fault detected during runtime.
Perform a panel restart. If the fault persists, perform a factory reset and re-download the project. If the issue continues, the panel may require hardware repair or replacement.

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 S7-200, S7-300, and S7-400 PLCs.

What software is required to configure the Siemens 6AV6355-1AA47-7EA4?

The panel is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are transferred to the panel via a PC adapter cable or PROFIBUS connection.

What is the supply voltage for this operator panel?

The OP 77A operates on a 24 V DC supply voltage. Ensure the power source is within the specified tolerance range to avoid damage or malfunction.

Is the OP 77A compatible with SIMATIC S7-1200 or S7-1500 PLCs?

The OP 77A is primarily designed for use with S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. Compatibility with S7-1200 or S7-1500 is limited and may require additional configuration or may not be supported.

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 when correctly installed in a panel cutout.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Check for blown fuses or wiring faults in the supply circuit.

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

Panel displays a communication error and cannot connect to the PLC

Check the MPI or PROFIBUS DP cable connections at both the panel and PLC ends. Verify bus termination resistors are correctly placed at both ends of the network segment.

Replace or reseat the communication cable. Confirm that the PLC station address in the HMI project matches the actual PLC configuration. Restart both devices after correcting any address or wiring issues.

Project transfer from engineering PC fails or times out

Verify that the PC adapter is correctly configured for the appropriate interface (MPI or USB). Check that the panel is set to transfer mode before initiating the download from WinCC flexible.

Set the panel to transfer mode via the Start Center menu. Ensure the correct COM port or USB driver is selected in WinCC flexible. Retry the transfer with the panel in a stable power state.

Keypad buttons are unresponsive or intermittently fail

Inspect the keypad membrane for physical damage, contamination, or wear. Check the internal ribbon cable connection between the keypad and the main board if the unit is open for service.

Clean the keypad surface with a dry cloth. If individual keys have failed due to membrane wear, the keypad membrane assembly should be replaced. Reseat the ribbon cable connector if accessible.

Panel restarts unexpectedly during operation

Monitor the 24 V DC supply voltage for voltage dips or instability under load. Check for excessive ambient temperature around the panel installation.

Stabilize the power supply by using a dedicated 24 V DC source with adequate current capacity. Ensure the panel installation location provides adequate ventilation and that the ambient temperature remains within the 0 °C to +50 °C operating range.

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