Siemens 6AV6355-1AA47-7BD0 OP 77A

€ 1.257,64

SKU: 6AV6355-1AA47-7BD0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7BD0 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 and is intended for use with Siemens SIMATIC S7 and other compatible controllers.

The OP 77A features a monochrome LCD display with a resolution of 160 x 80 pixels, providing clear text and basic graphic visualization. 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 IP65 on the front face, making it suitable for panel-mounted installations in industrial environments.

The OP 77A is widely used in manufacturing, machine building, and process automation applications where a cost-effective, robust operator interface is required. It is commonly found on standalone machines, conveyor systems, and packaging equipment where basic process visualization and parameter entry are needed. Its compact form factor and compatibility with the SIMATIC controller family make it a practical choice for OEMs and system integrators working with Siemens automation platforms.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
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
Configuration Software	WinCC flexible 2005 or higher
Series/Product Family	SIMATIC HMI OP 77A
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel 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 HMI project configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect the communication cable for damage or loose connectors. Check bus termination and cable shielding. Restart the HMI panel and verify PLC status.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel successfully.
Verify the PC-to-panel connection (USB or MPI). Ensure WinCC flexible version is compatible with the panel firmware. Retry the download after restarting both the PC and the panel.
Event ID: 40000: System memory low. The panel's available memory for runtime operation is insufficient.
Reduce the number of active screens or variables in the project. Optimize the project in WinCC flexible and reload the configuration.
Event ID: 50000: Firmware update error. The firmware update process was interrupted or failed.
Repeat the firmware update procedure using the correct firmware version for the OP 77A. Ensure stable power supply during the update process.
Event ID: 60000: Internal device error. A hardware fault has been detected within the panel.
Perform a factory reset of the panel. If the error persists, the unit likely requires hardware repair or replacement.
Event ID: 70000: Tag read/write error. The panel cannot read from or write to a configured PLC tag.
Verify the tag addresses in the WinCC flexible project match the actual PLC data blocks. Check PLC program for correct data area definitions.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A panel?

The OP 77A supports SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It also supports connection to SIMATIC S7-200 via PPI protocol.

What software is used to configure the 6AV6355-1AA47-7BD0?

The panel is configured using Siemens WinCC flexible 2005 or a later compatible version. The project is transferred to the panel via a PC adapter using MPI or a USB-to-MPI interface.

What is the supply voltage for this operator panel?

The OP 77A requires a 24 V DC power supply. The permissible voltage range is typically 19.2 V DC to 28.8 V DC.

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

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

Can the OP 77A display graphics and images?

The OP 77A supports basic graphics on its monochrome LCD display, including bar graphs and simple icons, but it is primarily designed for text-based process visualization and parameter entry.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel power connector. Verify polarity and measure actual voltage with a multimeter to confirm it is within the 19.2–28.8 V DC range.

Correct any wiring errors or supply voltage issues. If the supply is confirmed correct and the 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' or communication error on startup

Inspect the MPI or PROFIBUS DP cable for physical damage, correct pin assignment, and secure connections at both ends. Check that bus termination resistors are correctly placed at both ends of the bus segment.

Replace damaged cables, correct termination, and verify that the PLC address and baud rate settings in the HMI project match the actual PLC configuration. Restart both the PLC and the HMI panel.

Project download fails or transfer to panel is not possible

Confirm the PC adapter is correctly connected to the MPI port and that the correct COM port and baud rate are selected in WinCC flexible transfer settings. Check that the panel is in transfer mode.

Set the panel to transfer mode via the panel's start center menu. Ensure the WinCC flexible project is compiled without errors before initiating the transfer. Try a different PC adapter or cable if the issue persists.

Function keys do not respond or produce incorrect actions

Check the WinCC flexible project for correct key assignment on the affected screen. Verify that the panel firmware version is compatible with the project version used.

Re-download the project to the panel after verifying key assignments in WinCC flexible. If keys are physically unresponsive, the keypad membrane may be worn and require hardware replacement.

Panel restarts repeatedly or enters a boot loop

This may indicate a corrupted project file on the panel or an internal hardware fault. Attempt to access the panel's start center during boot by pressing the appropriate key combination.

Perform a factory reset from the start center menu and re-download the project. If the boot loop continues after a reset, the panel's internal flash memory or main board may be defective and requires professional repair.

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