Siemens 6AV6355-1AA47-7DL2 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7DL2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7DL2 is an operator panel belonging to the OP 77A series, part of the SIMATIC HMI product line from Siemens. This compact panel operator unit is designed for machine-level human-machine interface applications, providing a keypad-based interface for process monitoring and control. It belongs to the Micro Panel family and is intended for use with SIMATIC S7 PLCs and other compatible Siemens controllers.

The OP 77A features a monochrome LCD display with a resolution of 128 x 64 pixels, capable of displaying text and simple graphics. It communicates via MPI and PROFIBUS-DP interfaces, enabling direct integration into Siemens automation networks. The panel supports configuration through WinCC flexible software and provides function keys for operator input, along with LED indicators for status feedback. It operates on a 24 V DC supply and is built to withstand industrial environments with a front panel protection rating of IP65.

The OP 77A is widely used in manufacturing, packaging, and process automation applications where a cost-effective, compact operator interface is required at the machine level. Its keypad-based design makes it suitable for environments where touchscreen operation is impractical, such as in the presence of gloves or harsh conditions. Industries including food and beverage, automotive, and general machine building commonly deploy this panel for local operator control and status monitoring.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	128 x 64 pixels
Input Voltage	24 V DC
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% to 90% (non-condensing)
Configuration Software	WinCC flexible 2005 or higher
Mounting	Panel mounting
Series/Product Family	SIMATIC HMI OP 77A
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 10000: Configuration error detected on startup; the loaded project is incompatible or corrupt.
Re-transfer the correct WinCC flexible project to the panel using the configuration PC.
Event ID: 10001: Communication connection to the PLC has been lost or cannot be established.
Check MPI or PROFIBUS-DP cable connections, verify bus address settings, and confirm PLC is powered and communicating.
Event ID: 10002: Tag read error; the panel cannot read a configured PLC tag.
Verify the tag address in WinCC flexible matches the actual PLC data block or memory address. Check PLC program is running.
Event ID: 10003: Tag write error; the panel cannot write a value to the configured PLC tag.
Check that the PLC tag address is correct and that the memory area is not write-protected. Verify communication link integrity.
Event ID: 10004: System memory low; available panel memory is insufficient for the current project.
Reduce the project size by removing unused screens or tags, then re-transfer the project to the panel.
Event ID: 10005: Operating system error; internal firmware fault detected.
Perform a panel reset. If the fault persists, update or reinstall the panel firmware using the appropriate Siemens service tool.
Event ID: 10006: Power supply undervoltage detected; supply voltage has dropped below the minimum threshold.
Measure the 24 V DC supply at the panel connector. Ensure the power supply unit is rated adequately and check wiring for voltage drop.

Frequently Asked Questions

What configuration software is required for the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later version. Projects are transferred to the panel via MPI or a serial PC/PPI cable.

Which PLCs are compatible with the Siemens 6AV6355-1AA47-7DL2?

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

What is the supply voltage for this operator panel?

The panel operates on a 24 V DC supply. Ensure the power source is within the specified tolerance range to prevent undervoltage 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 when correctly panel-mounted with the supplied gasket.

Can the OP 77A display graphical images?

The OP 77A supports basic graphics and text on its 128 x 64 pixel monochrome LCD, but it is primarily designed for text-based and simple graphical operator interfaces rather than complex image display.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel power connector. Verify that the supply is within tolerance and that the wiring connections are secure.

Restore correct 24 V DC supply. If the supply is correct and the display remains blank, the internal power supply or LCD 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 undamaged. Check that the bus address configured in WinCC flexible matches the address set on the panel and that the PLC is powered and running.

Correct any address mismatches in the WinCC flexible project or panel settings. Replace damaged cables. Ensure the PLC is in RUN mode and the bus termination resistors are correctly placed at both ends of the network.

Project transfer from PC to panel fails

Confirm the correct transfer cable is being used (MPI or PC/PPI cable). Check that the transfer mode is enabled on the panel and that the COM port or USB-to-serial adapter is correctly configured on the PC.

Enable transfer mode on the panel via the Start Center menu. Use a known-good Siemens-compatible MPI or PC/PPI cable. Verify PC COM port settings match the transfer configuration in WinCC flexible.

Function keys do not respond or produce incorrect actions

Check the WinCC flexible project to confirm that function key assignments are correctly configured for the active screen. Inspect the keypad membrane for physical damage or contamination.

Correct the function key configuration in WinCC flexible and re-transfer the project. If keys are physically damaged or unresponsive due to membrane wear, the keypad membrane assembly should be replaced.

Panel repeatedly restarts or resets unexpectedly

Monitor the 24 V DC supply for voltage dips or instability under load. Check for loose wiring at the power connector. Inspect the panel for signs of overheating.

Stabilize the power supply and secure all wiring connections. Ensure the panel is installed within the specified operating temperature range. If restarts continue with a stable supply, the unit may have an internal hardware fault requiring professional repair.

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