Siemens 6AV6355-1AA47-7ES1 OP 77A

€ 2.111,89

SKU: 6AV6355-1AA47-7ES1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7ES1 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 is part of the SIMATIC HMI Basic Panels generation, offering reliable performance in demanding industrial environments.

The OP 77A features a monochrome LCD display with a resolution suited for text and simple graphic visualization, along with a membrane keypad for operator input. It supports the MPI and PROFIBUS DP communication interfaces, enabling direct integration with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using Siemens WinCC flexible software and offers onboard flash memory for project storage. It is rated to IP65 on the front face, providing protection against dust and water ingress in panel-mounted installations.

The OP 77A is widely used in machine building, packaging, material handling, and general factory automation applications where a cost-effective, robust operator interface is required. Its compact form factor makes it suitable for integration into control cabinets and machine panels with limited space. The panel is particularly common in applications where simple process visualization, alarm display, and recipe management are needed without the complexity of a full graphical touchscreen HMI.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Input Method	Membrane keypad
Communication Interface	MPI, PROFIBUS DP
Operating Voltage	24 V DC
Power Consumption	Max. 4.5 W
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
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Mounting	Panel mounting
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 10000: Configuration error detected on the HMI panel, indicating a mismatch or corrupted project data.
Re-download the project from WinCC flexible to the panel and verify configuration integrity.
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 operational.
Event ID: 10002: Tag read error — the panel cannot read a configured PLC variable.
Verify the PLC address and data block referenced in the tag configuration. Ensure the PLC program contains the expected data areas.
Event ID: 10003: Tag write error — the panel cannot write a value to the configured PLC variable.
Check write permissions for the target PLC address and confirm the data type matches the configured tag in WinCC flexible.
Event ID: 20000: Internal device error or hardware fault detected on the panel.
Perform a power cycle. If the fault persists, back up the project and perform a factory reset, then re-download the project.
Event ID: 40000: Project download interrupted or failed during transfer from the engineering PC.
Check the transfer cable connection, ensure WinCC flexible is set to the correct transfer mode, and retry the download.
Event ID: 10006: Alarm buffer overflow — the number of pending alarms exceeds the panel buffer capacity.
Acknowledge and clear existing alarms. Review alarm configuration to reduce simultaneous alarm occurrences.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

The OP 77A is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP communication interfaces.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or later versions. Projects are transferred to the panel via the MPI interface or a dedicated transfer cable.

What is the supply voltage for the 6AV6355-1AA47-7ES1?

The panel operates on 24 V DC supply voltage, typically sourced from a regulated DC power supply within the control cabinet.

Does the OP 77A support touchscreen input?

No, the OP 77A uses a membrane keypad for operator input and does not feature a touchscreen display.

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

The front face of the OP 77A is rated to IP65, providing protection against dust and low-pressure water jets when correctly panel-mounted with the supplied seal.

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 fully seated.

Restore correct 24 V DC supply. If voltage is correct and 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 on the panel matches the PLC network settings and that no address conflicts exist.

Correct the bus address in the panel transfer settings, replace damaged cables, and ensure the PLC is powered and the network is properly terminated at both ends.

Project download fails or transfer cannot be initiated

Confirm the panel is set to transfer mode (accessible via the panel's start menu). Check the PC interface settings in WinCC flexible match the physical connection being used.

Set the panel to transfer mode manually, verify the correct COM port or MPI adapter is selected in WinCC flexible, and retry the download. Replace the transfer cable if communication still fails.

Operator keys are unresponsive or produce incorrect input

Inspect the membrane keypad surface for physical damage, contamination, or deformation. Test individual keys in a diagnostic or transfer screen if accessible.

Clean the keypad surface with a dry cloth. If keys remain unresponsive, the membrane keypad assembly may be worn or damaged and the panel should be serviced or replaced.

Alarms are not displaying or alarm history is missing

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

Re-download the corrected project after verifying alarm tag addresses. Confirm the PLC program is setting the expected alarm bits and that the panel has an active connection to the PLC.

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