Siemens 6AV6355-1AA47-7ES3 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7ES3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7ES3 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for human-machine interface applications in industrial automation environments. This compact panel provides a key-based operator interface for process visualization and control, and is part of Siemens' established SIMATIC HMI product line. It is intended for use with Siemens SIMATIC S7 and S5 PLCs, offering straightforward integration into existing automation architectures.

The OP 77A features a monochrome LCD display with a resolution suited for text and simple graphic representation, along with a membrane keypad for operator input. It supports the MPI (Multi-Point Interface) and PROFIBUS-DP communication protocols, enabling direct connection to SIMATIC S7 controllers without additional hardware. The panel is configured using Siemens ProTool or WinCC flexible engineering software, and supports recipe management, alarm logging, and trend display functions within its onboard memory capacity.

The OP 77A is commonly deployed in machine-level control panels across manufacturing, packaging, and process industries where a compact, robust operator interface is required. Its keypad-based design makes it suitable for environments where touchscreen operation is impractical due to contamination or glove use. The panel's compatibility with the SIMATIC controller family makes it a practical choice for retrofitting or extending existing Siemens-based automation systems.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
Input/Operating Voltage	24 V DC
Power Consumption	Max. 6 W
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
Series/Product Family	SIMATIC HMI OP 77A
Engineering Software	ProTool, WinCC flexible

Common Error Codes & System Events

Event ID: 10000: Connection to the PLC could not be established or was interrupted.
Check MPI or PROFIBUS-DP cable connections and termination resistors. Verify PLC address settings match the OP configuration.
Event ID: 10001: Timeout error during communication with the configured PLC.
Check network cabling and bus termination. Verify the PLC is in RUN mode and the configured station address is correct.
Event ID: 20000: Tag read error — the panel cannot read a configured tag from the PLC.
Verify the tag address in the project configuration matches the actual PLC data block or memory address. Re-download the project if necessary.
Event ID: 20001: 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 engineering project.
Event ID: 40000: Project download failed or project data is corrupted.
Re-download the project from WinCC flexible or ProTool. Check the serial or MPI connection used for transfer and ensure sufficient panel memory is available.
Event ID: 50000: Internal device error or hardware fault detected.
Perform a panel reset. If the error persists, check the 24 V DC supply voltage and inspect the unit for hardware damage. Contact Siemens support or arrange for repair.
Event ID: 60000: Alarm buffer overflow — the number of pending alarms exceeds the buffer capacity.
Acknowledge and clear existing alarms. Review the alarm configuration to reduce the number of simultaneously active alarms or increase acknowledgement frequency.

Frequently Asked Questions

Which communication protocols does the OP 77A support?

The OP 77A supports MPI and PROFIBUS-DP protocols, allowing direct connection to SIMATIC S7 PLCs. No additional communication modules are required for these interfaces.

Which engineering software is used to configure the 6AV6355-1AA47-7ES3?

The panel is configured using Siemens ProTool or WinCC flexible software. The project is then downloaded to the panel via MPI or a serial connection.

What is the supply voltage for the OP 77A?

The OP 77A requires a 24 V DC supply voltage for operation.

Is the OP 77A compatible with SIMATIC S5 PLCs?

Yes, the OP 77A supports connection to SIMATIC S5 PLCs in addition to S7 controllers, using the appropriate protocol and cable configuration.

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 suitable for installation in control cabinet doors where it may be exposed to dust and water spray.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the panel's power connector. Check for blown internal fuses or wiring faults.

Ensure the 24 V DC supply is within tolerance. Replace any blown fuses and verify all connector pins are properly seated. If the display backlight has failed, the unit may require repair or backlight replacement.

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

Check the MPI or PROFIBUS-DP cable between the panel and PLC. Verify bus termination is correctly applied at both ends of the network segment.

Replace or reseat the communication cable. Confirm the PLC station address in the OP project matches the physical PLC configuration. Ensure the PLC is powered and in RUN mode.

Project download fails or is not accepted by the panel

Verify the engineering software version is compatible with the panel firmware. Check the transfer cable connection and that the panel is in transfer mode.

Set the panel to transfer mode via the Start Center menu. Use a compatible version of WinCC flexible or ProTool and retry the download. If memory errors occur, perform a factory reset before re-downloading.

Keys on the membrane keypad are unresponsive or intermittent

Inspect the membrane keypad for physical damage, contamination, or deformation. Test individual keys to identify whether the fault is isolated or affects the entire keypad.

Clean the keypad surface with a dry cloth. If individual keys have failed due to wear or damage, the membrane keypad assembly will need to be replaced as the panel requires hardware repair.

Alarm messages are not displayed or alarms are not acknowledged correctly

Review the alarm configuration in the engineering project. Check that the correct PLC bit addresses are assigned to alarm triggers and that the project has been successfully downloaded.

Re-download the project after verifying alarm tag addresses. Ensure the PLC program is setting and resetting alarm bits as expected. Clear the alarm buffer if it has reached capacity.

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