Siemens 6AV6355-1AA47-7HC1 OP 77A

€ 1.897,00

SKU: 6AV6355-1AA47-7HC1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7HC1 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 interface for monitoring and controlling automated processes. This unit is part of the SIMATIC HMI portfolio and is intended for integration into control cabinets or machine fronts.

The OP 77A features a monochrome LCD display with a fixed function key layout, enabling direct access to process values, alarms, and operator inputs without requiring a touchscreen. It supports the MPI and PROFIBUS DP communication interfaces, allowing seamless integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. Configuration is performed using WinCC flexible software, and the panel includes onboard flash memory for project storage. The unit operates on a 24 V DC supply and is built to meet the demands of industrial environments.

The OP 77A is commonly deployed in manufacturing, automotive, food and beverage, and general machine-building industries where a cost-effective, robust operator interface is required. Its compact form factor and key-based operation make it suitable for applications where touchscreen panels are not necessary and where reliable, direct operator input is preferred. The panel is typically mounted in control cabinet doors or machine enclosures.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.5 W
Communication Interface	MPI, PROFIBUS DP
Configuration Software	WinCC flexible 2005 or higher
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
Certifications	CE, UL, cULus
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400

Common Error Codes and System Events

Event ID: 10000: Communication error between the OP 77A and the connected PLC. The panel cannot establish or maintain a connection to the controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the panel configuration in WinCC flexible.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect the communication cable for damage or loose connectors. Check PLC power and operational status. Restart the panel after resolving the connection issue.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel.
Verify the PC-to-panel communication cable is correctly connected. Ensure WinCC flexible project settings match the panel type and firmware version.
Event ID: 40000: System error on the HMI panel. An internal fault has been detected.
Perform a panel restart. If the error persists, reload the project using WinCC flexible or perform a factory reset via the panel's loader menu.
Event ID: 50000: Alarm buffer overflow. The number of pending alarms has exceeded the panel's buffer capacity.
Acknowledge and clear existing alarms. Review the alarm configuration in WinCC flexible to reduce unnecessary alarm triggers.
Event ID: 60000: Tag update error. One or more process tags could not be read from the PLC.
Check that the PLC data blocks and addresses referenced in the WinCC flexible project are correct and accessible. Verify PLC program is running.
Event ID: 70000: Panel operating voltage out of range. Supply voltage has dropped below or exceeded the specified 24 V DC threshold.
Measure the supply voltage at the panel's power connector. Ensure the power supply unit provides a stable 24 V DC within the specified tolerance range.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

The OP 77A is compatible with 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 a later version of the software.

What is the supply voltage for the 6AV6355-1AA47-7HC1?

The panel requires a 24 V DC power supply for operation.

What is the IP protection rating of the OP 77A?

The front of the panel is rated IP65, providing protection against dust and water jets. The rear of the unit is rated IP20.

Does the OP 77A support touchscreen input?

No, the OP 77A is a key-operated panel and does not feature a touchscreen. Operator input is performed via the integrated function and system keys.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the power connector using a multimeter. Verify the power supply unit is functioning correctly and delivering stable voltage.

Ensure the supply voltage is within the 24 V DC tolerance range. If voltage is correct and the display remains blank, the internal power supply or backlight may be faulty and the unit may require repair or replacement.

Panel cannot communicate with the PLC

Verify the MPI or PROFIBUS DP cable is correctly connected to both the panel and the PLC. Check bus termination at both ends of the network and confirm the panel address in WinCC flexible matches the hardware configuration.

Replace or reseat the communication cable. Correct any address mismatches in the WinCC flexible project and reload the configuration to the panel. Ensure the PLC is in RUN mode.

Project download fails from WinCC flexible

Check the PC-to-panel transfer cable connection. Confirm the panel is in transfer mode by accessing the loader menu. Verify the WinCC flexible project is configured for the correct panel type and firmware version.

Switch the panel to transfer mode manually via the loader. Use the correct transfer cable and ensure the COM port or USB settings in WinCC flexible match the connected interface.

Keys are unresponsive or register incorrect inputs

Inspect the keypad membrane for physical damage, contamination, or wear. Check whether the issue is consistent across all keys or limited to specific ones.

Clean the keypad surface with a dry cloth. If specific keys are permanently unresponsive, the keypad membrane assembly may need to be replaced by a qualified repair technician.

Panel repeatedly restarts or freezes during operation

Check the supply voltage for instability or voltage dips. Inspect the project for configuration errors such as invalid tag addresses or communication timeouts that may cause the panel runtime to crash.

Stabilize the power supply and ensure it meets the panel's power requirements. Reload a verified WinCC flexible project to the panel. If the issue persists, perform a factory reset and reconfigure the device.

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