Siemens 6AV6355-1AA47-7CF3 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7CF3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CF3 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for human-machine interface applications in industrial automation environments. This unit is part of Siemens' compact operator panel lineup, providing a robust and reliable interface for machine-level control and monitoring. The OP 77A series is manufactured by Siemens and integrates seamlessly within the SIMATIC automation ecosystem.

The OP 77A features a monochrome STN LCD display with a resolution of 160 x 80 pixels, offering clear visualization of process data and operator prompts. It supports MPI and PROFIBUS DP communication interfaces, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs without additional hardware. The panel includes function keys and a numeric keypad for operator input, and is configured using WinCC flexible software. It operates on a 24 V DC supply and is rated to IP65 on the front face for protection against dust and water ingress.

The OP 77A is widely deployed in machine building, packaging machinery, conveyor systems, and general factory automation where a compact, cost-effective operator interface is required. Its compatibility with the SIMATIC S7 PLC family makes it a practical choice for OEMs and system integrators working within Siemens-based control architectures. The panel's rugged construction and front-face IP65 rating make it suitable for installation in industrial control cabinets and machine panels exposed to typical shop-floor conditions.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Colors	Monochrome (blue/white)
Input/Operating Voltage	24 V DC
Communication Interface	MPI, PROFIBUS DP
IP/Protection Rating	IP65 (front face)
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
Series/Product Family	SIMATIC HMI OP 77A
Certifications	CE, UL

Common Error Codes & 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 configured controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration in WinCC flexible.
Event ID: 10001: PLC connection timeout. The operator panel has lost communication with the PLC during operation.
Inspect the communication cable for damage or loose connectors. Confirm the PLC is powered and running. Re-download the project if configuration mismatch is suspected.
Event ID: 20000: Project download error. A fault occurred during transfer of the project from the engineering PC to the OP 77A.
Verify the transfer cable and PC interface settings. Ensure WinCC flexible version is compatible with the panel firmware. Retry the download after restarting the panel.
Event ID: 40000: Internal device error. A hardware or firmware fault has been detected within the operator panel.
Perform a factory reset and re-download the project. If the fault persists, the panel may require repair or replacement.
Event ID: 20001: Firmware update failed. The firmware transfer to the panel was interrupted or the firmware file is incompatible.
Restart the panel and retry the firmware update using the correct firmware version for the OP 77A. Ensure stable power supply during the update process.
Event ID: 10002: Address conflict detected on the MPI or PROFIBUS network. Another device is using the same network address as the OP 77A.
Check all device addresses on the MPI/PROFIBUS network and assign a unique address to the OP 77A via the panel settings menu.
Event ID: 30000: Configuration error. The loaded project contains settings that are incompatible with the connected hardware or firmware version.
Review the project configuration in WinCC flexible, ensure the correct panel type and firmware version are selected, and re-download the project.

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 interfaces. It can also communicate with S7-200 via PPI protocol.

What software is used to configure the OP 77A?

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

What is the supply voltage for the 6AV6355-1AA47-7CF3?

The panel operates on a 24 V DC supply voltage, which is the standard supply used across the SIMATIC HMI compact panel range.

What is the front-face protection rating of the OP 77A?

The OP 77A has an IP65 protection rating on the front face, making it resistant to dust ingress and low-pressure water jets when correctly installed in a panel cutout.

Can the OP 77A display graphical elements?

The OP 77A supports basic graphical elements such as bar graphs and status indicators on its monochrome LCD, but it is primarily designed for text-based process visualization rather than complex graphics.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the panel's power connector. Check that the supply is within the specified tolerance. Inspect the internal fuse if accessible.

Ensure the 24 V DC supply is stable and correctly wired. If the supply is confirmed good and the display remains blank, the panel's internal power circuitry or display may be faulty and the unit should be sent for repair.

Panel shows 'No connection to PLC' message continuously

Verify the MPI or PROFIBUS DP cable is securely connected at both the panel and PLC ends. Check bus termination at both ends of the network. Confirm the PLC address configured in WinCC flexible matches the actual PLC address.

Correct any wiring faults or address mismatches. Replace the communication cable if damaged. Ensure bus termination resistors are enabled only at the physical ends of the network.

Operator keys are unresponsive or intermittently responsive

Inspect the keypad membrane for physical damage, contamination, or wear. Check that the panel is not in transfer mode, which disables normal operation.

Clean the keypad area with a dry cloth. If keys remain unresponsive, the keypad membrane assembly may need replacement. Confirm the panel is in runtime mode and not awaiting a project download.

Project download fails or transfer cannot be initiated

Check the PC adapter cable connection between the engineering PC and the panel's MPI port. Verify the COM port settings in WinCC flexible match the adapter configuration. Confirm the panel is in transfer mode.

Switch the panel to transfer mode via the panel's start screen. Reinstall the PC adapter driver if necessary. Try a different USB or serial port on the engineering PC and retry the download.

Panel restarts repeatedly or enters a boot loop

A corrupted project or incompatible firmware may cause continuous restarts. Attempt to interrupt the boot sequence to access the panel's loader menu.

Access the loader menu during startup and perform a factory reset or re-download a compatible project. Ensure the firmware version on the panel matches the version targeted in the WinCC flexible project settings.

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