Siemens 6AV6355-1AA47-7ET2 OP 77A

€ 1.333,18

SKU: 6AV6355-1AA47-7ET2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7ET2 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. This compact panel operator unit is designed for human-machine interface applications, providing a keypad-based interface for machine monitoring and control. It belongs to the SIMATIC HMI Basic Panels generation, intended for straightforward operator control tasks in industrial environments.

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 integration with SIMATIC S7 PLCs. The unit operates on 24 V DC supply voltage and is built to withstand industrial conditions, carrying a front panel protection rating of IP65. Configuration is performed using WinCC flexible software, allowing tag-based screen programming and alarm management.

The OP 77A is widely used in machine building, manufacturing automation, and process control applications where a cost-effective, robust operator interface is required. It is particularly suited for integration with Siemens S7-200, S7-300, and S7-400 PLC families. Typical installations include packaging machinery, conveyor systems, and general-purpose industrial machines requiring local operator interaction.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Permissible Voltage Range	19.2 – 28.8 V DC
Power Consumption	Max. 4.5 W
Communication Interface	MPI, PROFIBUS DP
IP Rating (Front)	IP65
IP Rating (Rear)	IP20
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10 – 90 % (non-condensing)
Mounting	Panel mounting
Configuration Software	WinCC flexible 2005 or higher
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 010000: System startup – the panel is initializing and loading the project configuration.
Wait for the startup sequence to complete. If the panel does not proceed, check the project file integrity and reload via WinCC flexible.
Event ID: 020010: No project loaded on the device.
Transfer a valid project to the panel using WinCC flexible via MPI or PROFIBUS connection.
Event ID: 040010: Communication error – connection to the PLC has been lost or cannot be established.
Check MPI/PROFIBUS cable connections, verify bus address settings, and confirm the PLC is powered and communicating on the network.
Event ID: 070010: Tag read error – the panel cannot read the value of a configured tag from the PLC.
Verify the tag address in WinCC flexible matches the actual PLC data block or memory address. Check PLC program for correct data availability.
Event ID: 070011: Tag write error – the panel cannot write a value to the configured PLC tag.
Check write permissions for the tag in the PLC program. Verify the address mapping in WinCC flexible is correct and the PLC is in RUN mode.
Event ID: 080010: 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 unnecessary alarm triggers.
Event ID: 110000: Operating system error – an internal software fault has been detected.
Perform a panel restart. If the fault persists, reload the operating system firmware using ProSave and retransfer the project.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

The OP 77A is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It can also communicate with S7-200 via PPI protocol.

What software is used to configure the 6AV6355-1AA47-7ET2?

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

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 suitable for environments where dust and water jets may be present.

Can the OP 77A display graphics or images?

No, the OP 77A uses a character-based monochrome LCD display and does not support graphical or bitmap image display. It is limited to text and simple bar graph representations.

What is the supply voltage for the 6AV6355-1AA47-7ET2?

The unit requires a 24 V DC supply with a permissible operating range of 19.2 V DC to 28.8 V DC.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the power connector. Verify the voltage is within the 19.2–28.8 V DC permissible range. Check for blown internal fuse.

Correct the supply voltage if out of range. Replace the internal fuse if blown. If the display remains blank with correct supply, the LCD or internal power board may require replacement.

Panel shows 'No project' or fails to load project on startup

The panel memory may be empty or the project file may be corrupted. Connect a PC with WinCC flexible and attempt to read back the device status.

Retransfer a valid compiled project from WinCC flexible to the panel via MPI or PROFIBUS. Ensure the correct panel type is selected in the WinCC flexible project settings.

Communication fault with PLC – connection cannot be established

Check the MPI or PROFIBUS DP cable for continuity and correct termination resistors at bus ends. Verify the bus address configured on the panel matches the WinCC flexible project settings and does not conflict with other devices.

Correct any address conflicts, replace damaged cables, and ensure bus termination is applied only at the physical ends of the network. Restart both the panel and PLC after corrections.

Function keys do not respond or produce incorrect actions

Inspect the membrane keypad for physical damage or contamination beneath the keys. Verify the key assignments in the WinCC flexible project are correctly configured.

Clean the keypad surface. If keys are physically damaged, the front membrane assembly should be replaced. If the issue is configuration-related, correct the key assignments in WinCC flexible and retransfer the project.

Panel repeatedly restarts or crashes during operation

Check the supply voltage for instability or voltage dips under load. Review the event log for recurring system event codes that may indicate a software or memory fault.

Stabilize the power supply, ensuring adequate current capacity. If software-related, reload the panel firmware using ProSave and retransfer the project. If hardware faults persist, the unit should be sent for repair or replacement.

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