Siemens 6AV6355-1AA47-7ES6 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7ES6 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7ES6 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 monitoring and controlling machine processes, and is part of Siemens' established SIMATIC HMI product line. It is intended for use with Siemens SIMATIC S7 and other compatible PLC families.

The OP 77A features a monochrome LCD display and a membrane keypad with function keys, system keys, and numeric entry capability. It supports MPI and PROFIBUS DP communication interfaces for direct connection to SIMATIC S7 controllers. The panel is configured using Siemens WinCC flexible software and supports tag-based data exchange, alarm management, and recipe handling. The unit operates on a 24 V DC supply and is rated for industrial environments with an IP65 protection rating on the front panel.

The OP 77A is widely used in machine building, manufacturing automation, and process control applications 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. Industries such as automotive, food and beverage, packaging, and general manufacturing commonly deploy this panel for local operator interaction with PLC-controlled systems.

Technical Specifications

Series/Product Family	SIMATIC HMI OP 77A
Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
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)
Configuration Software	WinCC flexible 2005 or higher
Mounting	Panel mounting
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Communication error between the OP 77A 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 panel configuration in WinCC flexible.
Event ID: 10001: PLC is not responding or connection has been lost during operation.
Verify the PLC is powered and in RUN mode. Check physical cable integrity and bus termination. Restart the panel if the connection does not recover automatically.
Event ID: 20000: Configuration data on the panel is missing or corrupt.
Re-download the project from WinCC flexible to the panel. Ensure the correct project version is used and the transfer was completed without errors.
Event ID: 20001: Project version mismatch between the loaded project and the panel firmware.
Update the panel firmware to the version compatible with the WinCC flexible project, or recompile and re-transfer the project using the matching software version.
Event ID: 30000: Internal panel error or hardware fault detected during self-test at startup.
Power cycle the panel. If the error persists, check the 24 V DC supply voltage and wiring. Contact Siemens technical support or arrange for panel repair if the fault is not resolved.
Event ID: 40000: Tag limit exceeded. The number of configured tags exceeds the panel's supported capacity.
Review the WinCC flexible project and reduce the number of configured tags to within the OP 77A's supported limit. Re-download the project to the panel.
Event ID: 50000: Alarm buffer overflow. The alarm log has reached its maximum capacity.
Acknowledge and clear pending alarms on the panel. Archive or export the alarm log if required, then clear the buffer through the panel's system settings.

Frequently Asked Questions

What communication interfaces does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP interfaces, allowing direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs.

What software is used to configure the 6AV6355-1AA47-7ES6?

The panel is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are transferred to the panel via MPI or a serial PC/PPI cable.

What is the supply voltage for this operator panel?

The OP 77A operates on a 24 V DC supply voltage, which is standard for SIMATIC HMI panels in this series.

What is the front panel protection rating?

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 industrial machine panel installation.

Can the OP 77A be used with third-party PLCs?

The OP 77A is primarily designed for use with Siemens SIMATIC S7 controllers via MPI or PROFIBUS DP. Connectivity to third-party PLCs is limited and depends on available driver support within WinCC flexible.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel's power connector. Verify that the supply is within the specified range and that the wiring polarity is correct.

Correct any wiring faults or supply voltage issues. If the supply is confirmed correct and the display remains blank, the internal power supply or display assembly may be faulty and the unit should be sent for repair.

Panel shows communication error and cannot connect to PLC

Inspect the MPI or PROFIBUS DP cable for damage or loose connectors. Verify bus termination is correctly applied at both ends of the network. Check that the PLC address configured in WinCC flexible matches the actual PLC station address.

Replace damaged cables, correct termination, and ensure address settings match. Restart both the panel and the PLC after making changes to re-establish communication.

Project transfer from WinCC flexible fails

Confirm the correct transfer cable is connected and the panel is in transfer mode. Check that the WinCC flexible project is compiled without errors and that the software version is compatible with the panel firmware.

Place the panel in transfer mode via the Start Center menu, use the correct MPI or serial cable, and re-initiate the transfer. Update panel firmware if a version mismatch is identified.

Function keys do not respond to presses

Inspect the membrane keypad for physical damage, contamination, or deformation. Verify in the WinCC flexible project that the function keys are correctly configured and assigned to active screen objects.

Clean the keypad surface if contaminated. If keys are physically damaged, the keypad membrane may require replacement. Review and correct key assignments in the WinCC flexible project if the issue is configuration-related.

Panel repeatedly restarts or enters an error loop at startup

Check the 24 V DC supply for voltage drops or instability under load. Inspect the project configuration for errors that may cause a runtime fault during initialization.

Stabilize the power supply and ensure it is adequately rated for the panel's power consumption. Re-download a verified project to the panel. If restarts continue, perform a factory reset and re-transfer the project.

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