Siemens 6AV6355-1AA47-7CH1 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7CH1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CH1 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 interface for process visualization and operator control, and is part of Siemens' established SIMATIC HMI product line. It is intended for use with Siemens SIMATIC S7 and other compatible controllers via standard communication interfaces.

The OP 77A features a monochrome LCD display with a resolution of 160 x 80 pixels, providing clear readout of process values, alarms, and status information. The panel supports MPI and PROFIBUS DP communication protocols, enabling direct integration into existing Siemens automation networks. It offers configurable function keys for operator input, and is configured using Siemens WinCC flexible software. The unit operates on a 24 V DC supply and is rated IP65 on the front face for protection against dust and water ingress.

The OP 77A is commonly deployed in machine building, manufacturing, and process automation applications where a cost-effective, robust operator interface is required. It is well suited for controlling conveyor systems, packaging machinery, and general-purpose industrial equipment. Its compact form factor and keypad-based operation make it appropriate for panel-mounted installations where touchscreen functionality is not required.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Input Voltage	24 V DC
Voltage Tolerance	19.2 V DC to 28.8 V DC
Power Consumption	Approx. 3 W
Communication Interface	MPI, PROFIBUS DP
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)
Mounting	Panel mounting
Configuration Software	WinCC flexible 2005 or later
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC or controller.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify the configured station address matches the PLC settings. Restart both devices if necessary.
Event ID: 20000: Project download error or configuration data mismatch detected on the panel.
Re-download the project from WinCC flexible to the panel. Ensure the WinCC flexible version is compatible with the panel firmware version.
Event ID: 40000: Tag read/write error — the panel cannot access a configured PLC tag.
Verify the PLC program is running and the tag addresses configured in WinCC flexible match the actual PLC data block or memory addresses.
Event ID: 70000: Panel operating voltage out of tolerance — supply voltage is below or above the specified 24 V DC range.
Measure the supply voltage at the panel power connector. Ensure the supply is within 19.2 V DC to 28.8 V DC. Replace or adjust the power supply unit as needed.
Event ID: 80000: Internal panel fault detected, possibly related to firmware or hardware failure.
Perform a factory reset of the panel via the Start Center menu. If the fault persists, update the panel firmware or arrange for hardware repair/replacement.
System Fault: No Project: No valid project is loaded on the panel — the panel starts in an unconfigured state.
Download a valid WinCC flexible project to the panel using a PC with WinCC flexible software via MPI or PROFIBUS DP connection.
Communication Timeout: The panel has lost communication with the PLC and the configured timeout period has elapsed.
Check network cabling, connector integrity, and bus termination. Verify PLC is powered and running. Adjust the communication timeout setting in WinCC flexible if required.

Frequently Asked Questions

What communication protocols does the OP 77A support?

The OP 77A supports MPI and PROFIBUS DP communication protocols, allowing direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs as well as other PROFIBUS-compatible controllers.

What software is used to configure the Siemens 6AV6355-1AA47-7CH1?

The panel is configured using Siemens WinCC flexible software. A compatible version such as WinCC flexible 2005 or later is required to create and download projects to this panel.

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

The front face of the OP 77A is rated IP65, providing protection against dust ingress and low-pressure water jets, making it suitable for panel-mounted installations in industrial environments.

What is the supply voltage requirement for this panel?

The OP 77A requires a 24 V DC supply voltage, with an acceptable operating range of 19.2 V DC to 28.8 V DC.

Can the OP 77A be used as a direct replacement for older Siemens OP panels?

The OP 77A is designed as a successor to earlier SIMATIC HMI operator panels such as the OP7 and OP17. Migration is supported through WinCC flexible, though project conversion and address remapping may be required.

Troubleshooting

Display remains blank after power is applied

Check the 24 V DC supply voltage at the panel power connector using a multimeter. Verify the supply is within the 19.2 V DC to 28.8 V DC range. Inspect the connector for loose or damaged wiring.

Correct the supply voltage if out of range. Re-seat or replace the power connector. If the supply is correct and the display remains blank, the internal power supply or display unit may require repair or replacement.

Panel displays 'No connection to PLC' or communication error message

Inspect the MPI or PROFIBUS DP cable for physical damage, loose connectors, and correct bus termination at both ends of the network. Verify the station address configured on the panel matches the PLC settings.

Replace damaged cables or connectors. Correct the station address in the WinCC flexible project and re-download. Ensure bus termination resistors are correctly installed at the network endpoints.

Panel starts in Start Center mode with no project loaded

The panel has no valid project stored in its memory, or the project has been lost due to a firmware update or factory reset.

Connect a PC running WinCC flexible to the panel via MPI or PROFIBUS DP and download a valid project. Ensure the project is compiled without errors before transfer.

Function keys do not respond or produce incorrect actions

Verify the key assignments in the WinCC flexible project configuration. Check for physical damage to the keypad membrane or contamination under the keys.

Correct key assignments in the WinCC flexible project and re-download. If keys are physically damaged or unresponsive due to wear, the keypad membrane assembly should be replaced.

Panel firmware update fails or panel becomes unresponsive after update

A failed firmware update can leave the panel in an inconsistent state. Check the firmware version compatibility between the update file and the panel hardware revision.

Use the Siemens ProSave tool to restore or re-flash the panel firmware via MPI connection. Ensure the correct firmware version for the 6AV6355-1AA47-7CH1 hardware revision is used. If the panel remains unresponsive, professional repair may be required.

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