Siemens 6AV6355-1AA47-7ES2 OP 77A

€ 2.495,00

SKU: 6AV6355-1AA47-7ES2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7ES2 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 keypad-based interface for monitoring and controlling machine processes, and is part of Siemens' established SIMATIC HMI product line. It is intended for use with Siemens SIMATIC S7 PLCs and other compatible controllers via standard communication interfaces.

The OP 77A features a monochrome LCD display and a membrane keypad for operator input, offering a robust and reliable interface without a touchscreen. It supports MPI and PROFIBUS DP communication protocols, enabling direct integration into Siemens automation networks. The panel is configured using WinCC flexible software, allowing engineers to create and download project data for process visualization and operator control. Its compact housing and low power consumption make it suitable for panel-mounting in space-constrained installations.

The SIMATIC OP 77A is widely used in manufacturing, packaging, and process automation applications where a cost-effective, durable operator interface is required. It is commonly found on standalone machines, conveyor systems, and small to medium automation cells where basic process monitoring and parameter adjustment are needed. The panel's compatibility with the SIMATIC S7 controller family makes it a practical choice for system integrators working within established Siemens automation architectures.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4 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
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Connection to PLC lost or communication timeout on MPI/PROFIBUS interface.
Check MPI/PROFIBUS cable connections and termination resistors. Verify PLC is powered and running. Check configured station address matches the PLC.
Event ID: 10001: No project loaded on the operator panel.
Use WinCC flexible to compile and download a valid project to the OP 77A. Ensure the transfer connection is correctly configured.
Event ID: 20000: Tag read error — the panel cannot read a configured PLC data tag.
Verify the tag address in WinCC flexible matches the actual PLC memory address. Check PLC program for correct data block or variable definition.
Event ID: 20001: Tag write error — the panel cannot write a value to the configured PLC tag.
Check that the PLC tag is not write-protected. Verify address configuration in WinCC flexible and confirm PLC is in RUN mode.
Event ID: 40000: System memory low — internal panel memory is insufficient for current project.
Reduce project size by removing unused screens, tags, or graphics. Recompile and re-download the project using WinCC flexible.
Event ID: 50000: Transfer mode active — panel is waiting for project download.
Initiate project transfer from WinCC flexible on the engineering PC, or press ESC on the panel keypad to cancel transfer mode and return to runtime.
Event ID: 60000: Operating system or firmware version mismatch detected.
Update the panel firmware using the Siemens ProSave tool to match the version required by the WinCC flexible project.

Frequently Asked Questions

Which 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.

What software is required to configure the Siemens 6AV6355-1AA47-7ES2?

The panel is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are compiled and downloaded to the panel via the MPI or PROFIBUS interface.

What is the supply voltage for this operator panel?

The OP 77A requires a 24 V DC power supply. Ensure the supply is within the specified tolerance range to avoid damage or erratic 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 ingress and low-pressure water jets when correctly installed in a panel cutout.

Can the OP 77A be used with non-Siemens PLCs?

The OP 77A is primarily designed for use with Siemens SIMATIC S7 PLCs via MPI or PROFIBUS DP. Connectivity to third-party controllers is not natively supported by this panel.

Troubleshooting

Display remains blank after power is applied

Measure 24 V DC at the power supply terminals on the rear of the panel. Check the supply cable and connector for damage or loose connections.

Restore correct 24 V DC supply. If supply voltage is confirmed correct and the display remains blank, the internal power supply or LCD backlight may have failed and the unit should be sent for repair or replacement.

Panel shows 'Connecting…' and fails to establish communication with the PLC

Check the MPI or PROFIBUS DP cable between the panel and PLC. Verify bus termination is correctly applied at both ends of the network. Confirm the station address configured on the panel matches the PLC address.

Replace or reseat the communication cable. Correct the station address in the panel settings or WinCC flexible project. Ensure only the two physical end nodes have bus termination resistors enabled.

Panel enters transfer mode unexpectedly on startup

The panel may have been configured to start in transfer mode, or the transfer mode button combination was activated unintentionally during boot.

Allow the transfer to time out or press ESC to exit transfer mode. In WinCC flexible, configure the panel startup behavior to launch the runtime project directly rather than entering transfer mode.

Operator inputs via keypad are not responding or are erratic

Inspect the membrane keypad for physical damage, contamination, or worn key surfaces. Check that the project configuration correctly maps keypad functions to the intended actions.

Clean the keypad surface with a dry cloth. If keys remain unresponsive, the membrane keypad assembly may need replacement. Verify key assignments in the WinCC flexible project and re-download if necessary.

Project download fails during transfer from WinCC flexible

Check the MPI cable connection between the engineering PC and the panel. Verify the correct COM port or PC adapter is selected in WinCC flexible transfer settings. Confirm the panel is in transfer mode.

Reseat the MPI cable and select the correct interface in WinCC flexible. Ensure the PC adapter driver is correctly installed. If using a USB-MPI adapter, verify driver compatibility with the operating system version.

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