Siemens 6AV6355-1AA47-7CM0 OP 77A

€ 431,06

SKU: 6AV6355-1AA47-7CM0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CM0 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for machine-level human-machine interface applications. This compact panel provides a keypad-based interface for process visualization and control, and is part of Siemens' SIMATIC HMI product line. It is intended for use as a local operator interface in automation systems where a full graphical touchscreen is not required.

The OP 77A features a monochrome LCD display and a membrane keypad for operator input, supporting function keys and system keys for navigation and control. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration with Siemens SIMATIC S7 PLCs. The panel supports configuration via Siemens WinCC flexible engineering software, and offers a compact, panel-mount design with a protection rating suitable for industrial environments.

The OP 77A is commonly deployed in manufacturing, process automation, and machine tool applications where a cost-effective, robust operator interface is needed. It is well suited for controlling and monitoring discrete manufacturing equipment, conveyor systems, and packaging machinery. Its compatibility with the SIMATIC S7 controller family makes it a practical choice for system integrators working within the Siemens automation ecosystem.

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
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
Series/Product Family	SIMATIC HMI OP 77A
Engineering Software	WinCC flexible

Common Error Codes & System Events

Event ID: 10000: No connection to PLC. The operator panel cannot establish communication with the configured controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration.
Event ID: 10001: Connection to PLC interrupted. An established communication link to the controller has been lost.
Inspect cabling for damage or loose connectors. Check PLC operating state and ensure the network is free of interference.
Event ID: 20000: Project download error. Transfer of the configuration project from the engineering PC to the panel has failed.
Verify the transfer cable connection and PC communication settings. Ensure WinCC flexible project is compatible with the OP 77A firmware version.
Event ID: 40000: System memory low. Available memory on the panel is insufficient for the current project.
Reduce the size of the project (number of screens, variables, or alarms) and re-download the configuration.
Event ID: 50000: Firmware update error. An error occurred during a firmware update procedure.
Repeat the firmware update process using the correct firmware version for the OP 77A. Ensure stable power supply during the update.
Event ID: 60000: Configuration error. The loaded project contains settings incompatible with the panel hardware.
Review the project configuration in WinCC flexible for hardware-specific settings and re-download a corrected project to the panel.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

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

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible engineering software. The project is then transferred to the panel via a PC adapter cable.

What is the supply voltage for the 6AV6355-1AA47-7CM0?

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

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 and water jets.

Can the OP 77A display graphics or only text?

The OP 77A is a character-based panel and displays text across 4 lines of 20 characters each; it does not support graphical screen content.

Troubleshooting

Display remains blank after power on

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

Ensure the supply voltage is within the specified 24 V DC range. If voltage is correct and display remains blank, the internal power supply or display unit may be faulty and the panel should be sent for repair.

Panel shows 'No connection to PLC' message

Verify the MPI or PROFIBUS DP cable is correctly connected and terminated at both ends. Check that the PLC address and baud rate configured in the panel project match the PLC settings.

Correct any wiring faults, ensure proper bus termination, and confirm address and baud rate settings in WinCC flexible match the PLC configuration. Re-download the project if settings were changed.

Project transfer from PC to panel fails

Check the PC adapter cable connection between the engineering PC and the panel. Verify that the correct COM port and transfer settings are selected in WinCC flexible.

Replace or reseat the transfer cable, select the correct COM port in WinCC flexible, and retry the transfer. Ensure the panel is in transfer mode before initiating the download.

Function keys do not respond to presses

Inspect the membrane keypad for physical damage or contamination. Verify in the project that the function keys are assigned to the correct actions.

Clean the keypad surface if contaminated. If keys are physically damaged, the keypad membrane may need replacement. If the hardware is intact, review key assignments in the WinCC flexible project and re-download.

Panel repeatedly restarts or resets unexpectedly

Monitor the supply voltage for instability or voltage dips. Check for electromagnetic interference sources near the panel or its cabling.

Ensure the 24 V DC power supply is stable and adequately rated. Add shielding or reroute cables away from high-voltage or high-frequency interference sources. If the issue persists, the panel hardware may require inspection and repair.

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