Siemens 6AV6355-1AA47-7CD2 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7CD2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CD2 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 means of monitoring and controlling industrial processes. This unit belongs to 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 clear readability in various lighting conditions. It supports 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 Compact or Standard engineering software and supports a limited number of process tags, screens, and alarms suited to entry-level HMI requirements. The housing is rated IP65 on the front face, providing protection against dust and water jets in industrial environments.

The OP 77A is commonly deployed in machine building, manufacturing automation, and process control applications where a cost-effective, reliable operator interface is required. It is well suited for small to medium-sized machines where basic process visualization, parameter input, and alarm display are the primary requirements. Industries such as packaging, food and beverage, and general factory automation frequently utilize this panel for local operator stations.

Technical Specifications

Display Type	Monochrome LCD with backlight
Display Resolution	160 x 80 pixels
Number of Keys	10 function keys + navigation keys
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.5 W
Communication Interface	MPI, PROFIBUS DP
IP Protection Rating (Front)	IP65
IP Protection Rating (Rear)	IP20
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
Mounting	Panel mounting
Certifications	CE, UL
Engineering Software	WinCC flexible Compact / Standard

Common Error Codes & System Events

Event ID: 10000: Configuration error detected during startup; the project loaded on the panel is incompatible or corrupted.
Re-transfer the project from WinCC flexible engineering software. Verify the project version matches the panel firmware version.
Event ID: 10001: Communication connection to the PLC has been lost or cannot be established.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the panel configuration.
Event ID: 10002: Tag read error; the panel cannot read a configured process tag from the PLC.
Verify the tag address in the WinCC flexible project 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 target PLC memory area is not write-protected. Verify the tag address and data type in the project configuration.
Event ID: 10004: Panel internal memory error; project data in flash memory may be corrupted.
Perform a panel reset and re-transfer the project. If the error persists, the internal flash memory may require service or panel replacement.
Event ID: 10005: Firmware update error; firmware transfer to the panel was interrupted or failed.
Restart the firmware update procedure using ProSave or WinCC flexible. Ensure stable power supply and communication connection during the update.
Event ID: 10006: Alarm buffer overflow; the number of pending alarms exceeds the panel buffer capacity.
Acknowledge and clear existing alarms. Review the alarm configuration in the project to reduce simultaneous alarm occurrences.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A panel?

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

What engineering software is required to configure the 6AV6355-1AA47-7CD2?

This panel is configured using Siemens WinCC flexible Compact or WinCC flexible Standard software. The project is then transferred to the panel via MPI cable or PROFIBUS connection.

What is the supply voltage for this operator panel?

The OP 77A requires a 24 V DC power supply. 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 face of the OP 77A is rated IP65, providing full protection against dust ingress and resistance to water jets, making it suitable for industrial cabinet door mounting.

Can the OP 77A display graphical elements or only text?

The OP 77A has a monochrome LCD display with limited graphical capability. It supports basic bar graphs, static graphics, and text-based screens, but is not intended for complex graphical visualization.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the panel power connector. Check that the supply is within tolerance and that the connector is firmly seated.

Restore correct 24 V DC supply. If voltage is correct and display remains blank, the backlight or internal power supply board may be faulty and the panel should be sent for repair.

No communication with PLC after project transfer

Verify the MPI or PROFIBUS DP address configured in the WinCC flexible project matches the address set on the panel and the PLC. Check cable connections and bus termination at both ends.

Correct the address settings in the project and re-transfer. Replace the MPI or PROFIBUS cable if continuity testing reveals a fault. Ensure bus termination resistors are correctly placed at both ends of the network.

Panel repeatedly restarts or enters bootloader mode

This may indicate a corrupted or missing project in the panel memory, or a firmware mismatch. Connect to the panel via ProSave to check firmware version and project status.

Re-transfer the correct firmware version using ProSave, followed by re-transferring the WinCC flexible project. If the issue persists, the internal flash memory may be defective.

Function keys do not respond or respond incorrectly

Check the project configuration to confirm function key assignments are correctly defined. Inspect the keypad membrane for physical damage or contamination.

Re-transfer the project with corrected key assignments. If keys are physically damaged, the keypad membrane assembly should be replaced by a qualified technician.

Alarms are not displayed on the panel

Verify that the alarm tags are correctly configured in the WinCC flexible project and that the corresponding PLC bit addresses are active. Check that the alarm view object is present on the relevant screen.

Correct the alarm tag addresses in the project and re-transfer. Ensure the PLC program is setting the correct alarm bits and that the panel screen displaying alarms is accessible to the operator.

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