Siemens 6AV6355-1AA47-7EM7 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7EM7 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EM7 is an Operator Panel (OP 77A) belonging to the SIMATIC HMI Basic Panels product family. This compact operator panel is designed for straightforward machine-level human-machine interface tasks, providing a text-based display for process visualization and operator control. It is manufactured by Siemens as part of the SIMATIC HMI portfolio, targeting entry-level panel applications in industrial automation.

The OP 77A features a monochrome LCD text display capable of showing alphanumeric characters and basic process values. It communicates via the MPI/PROFIBUS DP interface, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs without additional hardware. The panel supports function keys for operator input and is configured using the WinCC flexible Micro or Compact engineering software. It operates on a 24 V DC supply and is built to withstand typical industrial environments with a front-face protection rating of IP65.

The OP 77A is commonly deployed on standalone machines and small production lines where basic status display and parameter entry are required. Typical industries include packaging machinery, conveyor systems, and general-purpose machine building. Its compact form factor and direct PLC connectivity make it suitable for retrofitting older control panels or integrating into space-constrained control cabinets.

Technical Specifications

Display Type	Monochrome LCD (STN)
Display Lines	4 lines of text
Characters per Line	20 characters
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4 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, cULus
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Communication error between the operator panel and the connected PLC. The panel cannot establish or maintain a connection to the configured controller.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to PLC interrupted during operation. The panel lost communication with the controller after a previously established connection.
Inspect cable integrity and connector seating. Check for electromagnetic interference sources near the communication cable. Restart both the panel and PLC if the connection does not recover automatically.
Event ID: 20000: Configuration error detected on the operator panel. The loaded project configuration is incompatible or corrupted.
Re-transfer the project from WinCC flexible to the panel. Verify the project was compiled without errors before transfer. Check that the correct panel type is selected in the engineering software.
Event ID: 20001: Project transfer failed or no valid project found on the panel.
Initiate a new project transfer via WinCC flexible using the correct communication settings. Ensure the panel is in transfer mode before starting the download.
Event ID: 40000: System memory error or internal panel fault detected.
Perform a factory reset of the panel and re-transfer the project. If the fault persists, the panel may require hardware repair or replacement.
Event ID: 50000: Tag read/write error. The panel cannot read from or write to a configured PLC data address.
Verify the PLC data block addresses configured in the project match the actual PLC program. Check that the PLC program is not write-protecting the relevant data areas.
Event ID: 60000: Operator panel startup error. The panel fails to complete its boot sequence.
Check the 24 V DC supply voltage at the panel connector. Perform a power cycle. If the panel does not boot, inspect for internal hardware faults and consider panel replacement or repair.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7EM7)?

The OP 77A is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It can also connect to SIMATIC S5 controllers using appropriate adapters.

What software is used to configure and program the OP 77A?

The OP 77A is configured using Siemens WinCC flexible Micro or WinCC flexible Compact engineering software. Projects are transferred to the panel via the MPI interface.

What is the supply voltage for the OP 77A?

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

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

The front face of the OP 77A carries an IP65 protection rating, making it suitable for panel-mount installations where dust and water spray resistance is required.

Can the OP 77A display graphics or only text?

The OP 77A is a text-based operator panel and displays alphanumeric characters only. It does not support graphical process visualization; for graphical displays, a higher-tier SIMATIC HMI panel such as the TP or MP series should be used.

Troubleshooting

Display remains blank after power on

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

Correct any supply voltage issues. If the supply is confirmed good and the display remains blank, the panel's internal power supply or display unit may be faulty and require repair or replacement.

Panel shows 'Connecting…' and cannot establish communication with the PLC

Verify MPI/PROFIBUS DP cable connections at both the panel and PLC ends. Check that bus termination resistors are correctly installed at both ends of the network. Confirm the MPI address and baud rate in the panel project match the PLC settings.

Correct any wiring or termination issues. Adjust the MPI address or baud rate in WinCC flexible if there is a mismatch, recompile, and re-transfer the project to the panel.

Project transfer from WinCC flexible fails

Check the communication cable between the PC and the panel MPI port. Verify the panel is set to transfer mode. Confirm the correct COM port and transfer settings are selected in WinCC flexible.

Place the panel in transfer mode via the Start Center menu. Use a known-good PC-to-MPI adapter cable. Retry the transfer with the correct baud rate and interface settings configured in WinCC flexible.

Function keys do not respond to operator input

Check whether the panel is in an active alarm or fault state that may be blocking input. Verify the project configuration to ensure function key events are correctly assigned.

Acknowledge any active alarms displayed on the panel. If keys remain unresponsive, perform a power cycle. If the issue persists, the keypad membrane or internal electronics may require inspection and repair.

Panel displays incorrect or frozen process values

Check the PLC communication link status. Verify that the PLC program is actively updating the data addresses configured in the panel project. Check for any communication error events on the panel.

Restore communication between the panel and PLC if interrupted. Confirm the correct PLC data addresses are mapped in the WinCC flexible project. Re-transfer the project if configuration errors are suspected.

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