Siemens 6AV6355-1AA47-7ED2 OP 77A

€ 149,14

SKU: 6AV6355-1AA47-7ED2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7ED2 is the OP 77A operator panel, part of the SIMATIC HMI Basic Panels product family manufactured by Siemens. This compact operator panel is designed for straightforward machine-level visualization and control tasks, providing a cost-effective human-machine interface solution. It belongs to the SIMATIC HMI portfolio and is intended for use with Siemens SIMATIC S7 PLCs and other compatible controllers.

The OP 77A features a monochrome STN 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 integration into existing Siemens automation networks. The panel is configured using WinCC flexible software and supports basic HMI functions including alarm management, recipe handling, and trend display. The unit operates on a 24 V DC supply and is rated to IP65 on the front face for protection against dust and water ingress.

The OP 77A is widely used in manufacturing, packaging, and process automation applications where a simple, reliable operator interface is required at the machine level. Its compact form factor and panel-mount design make it suitable for integration into control cabinets and machine panels with limited space. Industries such as food and beverage, automotive assembly, and general factory automation commonly deploy this panel for local operator interaction with SIMATIC-based control systems.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Size	4 inch
Input/Operating Voltage	24 V DC
Power Consumption	4.5 W (typical)
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)
Mounting	Panel mount
Configuration Software	WinCC flexible 2005 or higher
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 1000: Controller connection lost – the HMI panel cannot establish or has lost communication with the configured PLC.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify PLC is powered and in RUN mode. Confirm correct station address settings on both devices.
Event ID: 1003: Communication timeout – no response received from the controller within the configured timeout period.
Check network cabling and bus termination. Verify baud rate and station address match between HMI and PLC configuration. Reduce bus load if necessary.
Event ID: 10000: Configuration error – the project loaded on the panel does not match the connected controller type or version.
Reload the correct project using WinCC flexible. Verify the PLC type and firmware version match the HMI project configuration.
Event ID: 10001: Tag read/write error – the HMI panel is unable to read from or write to a configured PLC tag/data block address.
Verify the PLC data block and address referenced in the HMI project exist and are accessible. Check PLC program for correct DB definitions.
Event ID: 20000: System memory low – the panel's available runtime memory is insufficient to execute the current project.
Reduce the number of active screens, alarms, or recipes in the project. Optimize the project in WinCC flexible and reload.
Event ID: 40000: Backlight failure – the display backlight has reached end of life or has failed.
The backlight is not field-replaceable on this unit. Return the panel for repair or replacement of the display assembly.
Event ID: 2000: Alarm buffer overflow – the number of pending alarms exceeds the panel's alarm buffer capacity.
Acknowledge and clear existing alarms. Review the alarm configuration in WinCC flexible to reduce simultaneous alarm occurrences.

Frequently Asked Questions

What communication interfaces does the OP 77A (6AV6355-1AA47-7ED2) support?

The OP 77A supports MPI and PROFIBUS DP communication interfaces, allowing direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs as well as other PROFIBUS DP-compatible controllers.

What software is required to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later version. Projects are created on a PC and transferred to the panel via MPI cable or memory card.

What is the supply voltage for the 6AV6355-1AA47-7ED2?

The panel operates on a 24 V DC supply voltage. Ensure the power supply is within the specified tolerance range to avoid damage or operational issues.

Is the OP 77A compatible with SIMATIC S7-1200 or S7-1500 PLCs?

The OP 77A is primarily designed for use with S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It does not natively support PROFINET, so direct integration with S7-1200 or S7-1500 via Ethernet is not supported.

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

The front panel of the OP 77A is rated to IP65, providing protection against dust ingress and low-pressure water jets, making it suitable for installation in industrial machine panels.

Troubleshooting

Display remains blank after power on

Measure 24 V DC at the power supply connector on the rear of the panel. Check that the voltage is within the specified tolerance. Inspect the internal fuse if accessible.

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

HMI panel shows 'No connection to PLC' or communication error on startup

Check MPI or PROFIBUS DP cable connections at both the panel and PLC. Verify bus termination resistors are correctly placed at both ends of the network. Confirm station addresses are correctly configured.

Replace or reseat communication cables. Correct station address settings in WinCC flexible project and on the PLC. Ensure only the two physical end nodes have bus termination enabled.

Touchscreen or keypad buttons not responding

Determine whether the issue is with specific keys or all input. Check for physical damage to the keypad membrane. Attempt a panel restart to rule out software lockup.

If a soft reset does not resolve the issue, the keypad membrane or front panel assembly may be worn or damaged and requires replacement. For software lockup, reload the project via WinCC flexible.

Project transfer from WinCC flexible fails

Verify the MPI cable is correctly connected and the correct COM port is selected in WinCC flexible transfer settings. Check that the panel is in transfer mode (accessible via the panel's start center).

Place the panel in transfer mode manually via the start center menu. Confirm the MPI address and baud rate in the transfer settings match the panel configuration. Try a different MPI cable if the issue persists.

Alarms are not displaying or updating on the panel

Check that the alarm tags in the WinCC flexible project are correctly linked to the PLC data addresses. Verify PLC communication is active and the alarm bits are being set correctly in the PLC program.

Correct any misconfigured tag addresses in the WinCC flexible project and retransfer the project to the panel. Confirm the PLC program logic is correctly setting and resetting alarm bits.

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