Siemens 6AV6355-1AA47-7EE0 OP 77A

€ 1.722,53

SKU: 6AV6355-1AA47-7EE0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EE0 is an OP 77A operator panel belonging to the SIMATIC HMI Basic Panels product family. This compact panel operator unit is designed for straightforward machine-level human-machine interface tasks, providing a keypad-based interface for monitoring and controlling industrial automation systems. It is manufactured by Siemens and integrates seamlessly within the SIMATIC automation environment.

The OP 77A features a monochrome LCD display and a membrane keypad with function keys, system keys, and numeric/alphanumeric input capability. It supports the MPI and PROFIBUS DP communication interfaces, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs without additional hardware. The panel is configured using WinCC flexible software and offers a modest tag memory suitable for straightforward HMI applications with limited screen and variable requirements.

The OP 77A is commonly deployed in machine building, conveyor systems, packaging machinery, and general factory automation where a cost-effective, robust operator interface is required. Its compact form factor and keypad-based operation make it well suited for environments where touchscreen operation is impractical or where operators require tactile feedback. The panel is particularly popular in applications requiring simple setpoint entry, status monitoring, and alarm acknowledgment at the machine level.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	3.5 W (typical)
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 Rating (Front)	IP65
IP Rating (Rear)	IP20
Mounting	Panel mounting
Configuration Software	WinCC flexible 2005 or higher
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Certifications	CE, UL, cULus

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 and baud rate settings match the panel configuration in WinCC flexible.
Event ID: 10001: Connection to the configured PLC has been lost during operation.
Inspect physical communication cables for damage. Confirm the PLC is powered and in RUN mode. Re-establish communication by checking network topology and address assignments.
Event ID: 20000: Configuration error detected. The project loaded on the panel is incompatible or corrupt.
Re-download the WinCC flexible project to the panel using the correct software version. Ensure the project was compiled without errors before transfer.
Event ID: 40000: Operating system error or internal firmware fault detected on the panel.
Perform a panel reset by cycling power. If the fault persists, update or reinstall the panel firmware using ProSave or WinCC flexible.
Event ID: 50000: Alarm buffer overflow. The number of pending alarms exceeds the panel buffer capacity.
Acknowledge and clear active alarms. Review the alarm configuration in WinCC flexible to reduce simultaneous alarm occurrences or increase acknowledgment frequency.
Event ID: 60000: Tag update error. One or more configured tags cannot be read from or written to the PLC.
Verify that the tag addresses configured in WinCC flexible match the actual PLC data block or memory addresses. Check for address conflicts in the PLC program.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7EE0)?

The OP 77A is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with 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 2005 or later versions. Projects are transferred to the panel via the MPI interface or a direct PC-to-panel connection using ProSave.

What is the supply voltage for the OP 77A?

The OP 77A requires a 24 V DC supply voltage. Ensure the power source is within the specified tolerance range to avoid panel faults.

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 typical industrial panel installations.

Can the OP 77A display graphics or only text?

The OP 77A is a character-based operator panel and displays text in a 4-line by 20-character format. It does not support graphical screen content or bitmap images.

Troubleshooting

Display remains blank after power is applied

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

Restore correct 24 V DC supply voltage within the specified tolerance. If the display remains blank with correct voltage, the internal power supply or display unit may be faulty and the panel should be repaired or replaced.

Panel shows communication error and cannot connect to PLC

Verify MPI or PROFIBUS DP cable continuity and check that bus termination resistors are correctly installed at both ends of the network. Confirm the panel address and baud rate in WinCC flexible match the PLC network settings.

Correct any wiring faults, install proper termination, and ensure address and baud rate settings are consistent across all devices on the network. Re-download the project if configuration changes are made.

Project download from PC to panel fails

Check the PC-to-panel communication cable and confirm the correct COM port or USB-to-MPI adapter is selected in WinCC flexible or ProSave. Verify the panel is in transfer mode.

Place the panel in transfer mode via the panel start screen, select the correct interface in the transfer software, and retry the download. Replace the communication cable or adapter if the connection cannot be established.

Function keys do not respond or produce incorrect input

Inspect the membrane keypad for physical damage, contamination, or deformation. Test each key systematically in the panel's built-in self-test mode if available.

Clean the keypad surface with a dry cloth. If keys are physically damaged or contacts are worn, the membrane keypad assembly should be replaced by a qualified technician.

Alarms are not displayed or acknowledged correctly

Review the alarm configuration in the WinCC flexible project to confirm alarm tags are correctly mapped to PLC addresses. Check that the PLC program is setting and resetting alarm bits as expected.

Correct any tag address mismatches in the WinCC flexible project and re-download to the panel. Verify PLC logic for alarm bit control and ensure the alarm acknowledgment model matches the panel configuration.

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