Siemens 6AV6355-1AA47-7EG0 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7EG0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EG0 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. It is a compact, key-operated panel designed for machine-level human-machine interface applications, providing operators with a straightforward interface for monitoring and controlling automated processes. The OP 77A is part of the SIMATIC HMI Basic Panels generation and is intended for use with Siemens SIMATIC S7 controllers.

The OP 77A features a monochrome LCD display with a resolution of 160 x 80 pixels and a backlit screen for readability in varying ambient light conditions. It communicates via MPI and PROFIBUS DP 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 supports function keys for direct operator input. It operates on a 24 V DC supply and is rated IP65 on the front face for protection against dust and water ingress.

The OP 77A is widely deployed in manufacturing, machine building, and process automation environments where a cost-effective, reliable operator interface is required at the machine level. Its compact form factor and robust construction make it suitable for installation in control cabinets and machine panels in industries such as automotive, food and beverage, packaging, and general factory automation. The panel is particularly suited to applications requiring simple setpoint entry, status display, and alarm acknowledgment.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Display Size	4 inch
Input/Operating Voltage	24 V DC
Communication Interface	MPI, PROFIBUS DP
IP/Protection Rating	IP65 (front), IP20 (rear)
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
Mounting	Panel mounting
Configuration Software	WinCC flexible 2008
Series/Product Family	SIMATIC HMI OP 77A
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 1000: Connection to PLC lost or communication timeout detected.
Check MPI/PROFIBUS cable connections and termination resistors. Verify PLC is powered and running. Check configured station address matches PLC settings.
Event ID: 1003: Tag read error — the panel cannot read a configured tag from the PLC.
Verify the tag address configured in WinCC flexible matches the actual PLC data block or memory address. Check PLC program is running and the address exists.
Event ID: 1004: Tag write error — the panel cannot write a value to the configured PLC tag.
Check that the target PLC memory area is not write-protected. Verify the tag address and data type are correctly configured in WinCC flexible.
Event ID: 10000: System startup — panel has completed initialization and is starting the runtime project.
Informational event. No action required unless startup fails to complete, in which case check project integrity and reload via WinCC flexible.
Event ID: 10001: Runtime project loading error — the project file on the panel is corrupt or missing.
Reload the project to the panel using WinCC flexible. Ensure the correct project version is transferred and the transfer connection is stable.
Event ID: 20000: Power supply voltage out of tolerance — supply voltage below or above acceptable range.
Measure the 24 V DC supply at the panel connector. Ensure supply is within the specified range. Check for voltage drops due to cable length or load.
Event ID: 40000: Operating system error — internal software fault detected.
Perform a panel restart. If the fault persists, restore the panel to factory settings and reload the project. Contact Siemens support if the issue recurs.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

The OP 77A supports direct connection to 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 OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2008 or later. Projects are transferred to the panel via the MPI/PROFIBUS interface or a USB-to-MPI adapter.

What is the supply voltage for the 6AV6355-1AA47-7EG0?

The panel requires a 24 V DC power supply. Ensure the supply is within the specified tolerance range to avoid power-related faults.

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

The front face of the OP 77A is rated IP65, providing protection against dust ingress and low-pressure water jets. The rear of the panel is rated IP20.

Can the OP 77A display alarms and messages?

Yes, the OP 77A supports alarm and message display, including alarm acknowledgment via the integrated function keys. Alarm classes and messages are configured in WinCC flexible.

Troubleshooting

Display remains blank after power on

Check that 24 V DC is present at the power supply terminals using a multimeter. Inspect the supply cable and connector for damage or loose connections.

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

Panel shows 'No connection to PLC' or communication error on startup

Verify the MPI or PROFIBUS DP cable is correctly connected and terminated at both ends. Check that the PLC station address configured in WinCC flexible matches the actual PLC address setting.

Replace or reseat the communication cable. Correct the station address in the WinCC flexible project and retransfer. Ensure PROFIBUS termination resistors are enabled only at the physical ends of the bus.

Operator keys are unresponsive or produce incorrect input

Check for physical damage to the keypad membrane. Verify the project configuration in WinCC flexible to ensure function keys are correctly assigned.

If the keypad membrane is damaged, the panel requires hardware repair or replacement. If the issue is configuration-related, correct the key assignments in WinCC flexible and retransfer the project.

Project transfer from WinCC flexible fails

Check the communication interface connection between the PC and the panel. Verify the panel is in transfer mode and the correct interface (MPI address, baud rate) is selected in WinCC flexible.

Set the panel to transfer mode via the Start Center menu. Ensure the MPI adapter or PROFIBUS cable is correctly installed on the PC. Match the baud rate and MPI address settings between WinCC flexible and the panel.

Panel displays corrupted graphics or incorrect screen content

The project file on the panel may be corrupt or an incomplete transfer may have occurred. Check the WinCC flexible project for configuration errors.

Retransfer the complete project to the panel using WinCC flexible. If corruption persists, perform a factory reset on the panel and reload the project from a known good backup.

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