Siemens 6AV6355-1AA47-7CE4 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7CE4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CE4 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 keypad-based interface for process monitoring and control, and is part of Siemens' established SIMATIC HMI product line. It is intended for use with Siemens SIMATIC S7 and S5 controllers as well as third-party PLCs via standard communication protocols.

The OP 77A features a monochrome LCD display with a resolution of 128 x 64 pixels, providing clear visualization of process values, alarms, and status messages. It supports MPI and PROFIBUS DP communication interfaces for direct integration with SIMATIC S7 controllers, and includes a membrane keypad with function keys for operator input. 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.

The OP 77A is widely deployed in machine building, packaging machinery, conveyor systems, and general factory automation where a cost-effective, robust operator interface is required. Its compact form factor and panel-mount design make it suitable for integration into control cabinets and machine enclosures. The keypad-based operation without a touchscreen makes it particularly suitable for environments where gloves are worn or where touchscreen surfaces may be exposed to contamination.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	128 x 64 pixels
Display Size	4 inch
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 during operation.
Check MPI or PROFIBUS DP cable connections, verify PLC address settings, and confirm the PLC is powered and in RUN mode.
Event ID: 10001: Communication timeout: No response received from the configured PLC within the expected time.
Verify network cabling, check bus termination resistors, and confirm correct baud rate settings on both the panel and PLC.
Event ID: 20000: Project download failed or project data in the panel is corrupted.
Re-download the project from WinCC flexible or ProTool to the panel. Check USB or serial transfer cable integrity.
Event ID: 40000: Alarm buffer overflow: The number of pending alarms exceeds the panel's alarm buffer capacity.
Acknowledge and clear existing alarms. Review alarm configuration in the project to reduce unnecessary alarm triggers.
Event ID: 50000: Internal device error detected during self-test at startup.
Perform a factory reset of the panel. If the error persists, the unit may require repair or replacement of internal components.
Event ID: 60000: Operating voltage out of permissible range detected by internal monitoring.
Measure the 24 V DC supply voltage at the panel connector. Ensure the supply is stable and within the specified tolerance of 20.4 V to 28.8 V DC.
Event ID: 70000: Recipe data error: Recipe record could not be read or written correctly.
Check available memory on the panel. Re-download recipe data from the engineering system and verify recipe configuration in the project.

Frequently Asked Questions

What communication interfaces does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP communication interfaces, allowing direct connection to Siemens SIMATIC S7 controllers. Third-party PLC connectivity may also be possible via PROFIBUS DP with appropriate driver configuration.

Which engineering software is used to configure the 6AV6355-1AA47-7CE4?

The panel is configured using Siemens ProTool or WinCC flexible software. WinCC flexible is the preferred tool for newer projects, while ProTool is supported for legacy configurations.

What is the supply voltage requirement for this operator panel?

The OP 77A requires a 24 V DC supply voltage. The permissible voltage range is typically 20.4 V to 28.8 V DC.

Does the OP 77A support touchscreen input?

No, the OP 77A uses a membrane keypad with dedicated function keys for operator input. It does not feature a touchscreen display.

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.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel's power connector using a multimeter. Verify that the supply is within the 20.4 V to 28.8 V DC range and that the connector is fully seated.

Restore the supply voltage to within specification. If voltage is correct and the display remains blank, inspect the internal fuse and replace if blown. If the fault persists, the panel may require internal repair.

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

Verify the MPI or PROFIBUS DP cable is correctly connected and undamaged. Check that bus termination is applied at both ends of the network and that the PLC address configured in the project matches the actual PLC settings.

Replace or reseat the communication cable. Correct any address mismatches in the WinCC flexible or ProTool project and re-download the project to the panel. Ensure bus termination resistors are correctly installed.

Panel freezes or becomes unresponsive during operation

Determine whether the freeze is reproducible under specific conditions such as high alarm frequency or recipe operations. Check for project configuration errors using the engineering software.

Perform a controlled restart of the panel by cycling the 24 V DC supply. If the issue recurs, re-download the project to the panel. Consider updating the panel firmware if a newer version is available from Siemens.

Function keys do not respond to presses

Inspect the membrane keypad surface for physical damage, contamination, or deformation. Test each key systematically using the panel's built-in key test function if available in the service menu.

Clean the keypad surface with a dry cloth. If individual keys are non-functional due to membrane damage, the keypad membrane assembly will need to be replaced as a service part.

Project download fails or transfer is interrupted

Check the transfer cable connection between the PC and the panel. Verify that the panel is set to transfer mode and that the correct communication port and transfer settings are selected in WinCC flexible or ProTool.

Reseat the transfer cable and retry the download. Ensure no other software is occupying the COM port. If using a USB-to-serial adapter, verify driver compatibility with the operating system and try a different adapter if necessary.

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