Siemens 6AV6355-1AA47-7DM4 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7DM4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7DM4 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, offering a monochrome display and a structured keypad for operator input. This unit is part of the SIMATIC HMI Basic Panels generation, intended for straightforward visualization and control tasks in industrial environments.

The OP 77A features a monochrome STN LCD display and is equipped with function keys and system keys for direct operator interaction without touchscreen input. It supports PROFIBUS DP and MPI communication interfaces, enabling integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and supports recipe management, alarm logging, and trend display functions within its onboard memory capacity.

The OP 77A is widely deployed in manufacturing, packaging, and process automation applications where a cost-effective, robust operator interface is required at the machine level. Its compact form factor and keypad-based operation make it suitable for environments where touchscreen panels are impractical, such as dusty or high-vibration settings. Industries including food and beverage, automotive assembly, and general machine building commonly use this panel for local operator control and status monitoring.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
Input/Operating Voltage	24 V DC
Power Consumption	Approx. 4 W
Communication Interface	PROFIBUS DP, MPI
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
IP/Protection Rating	IP65 (front panel)
Mounting	Panel mounting
Configuration Software	WinCC flexible 2008
Series/Product Family	SIMATIC HMI OP 77A
Certifications	CE, UL

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 configured controller.
Check PROFIBUS DP or MPI cable connections and termination resistors. Verify the PLC address settings match the HMI project configuration. Ensure the PLC is in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect communication cables for damage or loose connectors. Check bus termination and cable shielding. Restart the panel and PLC if the connection does not recover automatically.
Event ID: 20000: Configuration error detected. The project loaded on the panel is incompatible or corrupt.
Re-transfer the project from WinCC flexible to the panel. Verify the project was compiled without errors before transfer.
Event ID: 40000: System memory low. Available memory on the panel is insufficient for current operations.
Reduce the number of active alarms or recipe entries. Optimize the project to reduce memory usage and re-transfer to the panel.
Event ID: 70010: Alarm buffer overflow. The number of pending alarms exceeds the buffer capacity of the panel.
Acknowledge and clear existing alarms. Review the alarm configuration in WinCC flexible to reduce the number of simultaneous alarms or increase the buffer size if configurable.
Event ID: 50000: Operating system error on the HMI panel. An internal system fault has been detected.
Perform a panel restart. If the fault persists, perform a factory reset and re-transfer the project. Contact Siemens technical support if the issue recurs.
Event ID: 60000: Transfer mode active. The panel is waiting for a project transfer from the configuration PC.
Transfer the project using WinCC flexible, or restart the panel to exit transfer mode if no transfer is intended.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A panel?

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

What software is used to configure the 6AV6355-1AA47-7DM4?

The panel is configured using Siemens WinCC flexible 2008 software. Projects are compiled and transferred to the panel via the RS-232 or USB interface on the configuration PC.

What is the supply voltage for this operator panel?

The OP 77A requires a 24 V DC supply voltage for operation.

Does the OP 77A support touchscreen input?

No, the OP 77A is a key-operated panel and does not feature a touchscreen. Operator input is performed via the integrated function keys and system keys.

What is the front panel protection rating of the 6AV6355-1AA47-7DM4?

The front panel of the OP 77A carries an IP65 protection rating, making it suitable for use in environments with dust and water spray.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel power connector using a multimeter. Verify the power supply is within the specified voltage range and can deliver sufficient current.

Ensure the 24 V DC supply is stable and correctly connected. If the supply is confirmed good but the display remains blank, the internal power supply or backlight may be faulty and the unit should be sent for repair or replacement.

Panel shows 'No connection to PLC' or communication error on startup

Verify the PROFIBUS DP or MPI cable is correctly connected and terminated at both ends. Check that the PLC address configured in the HMI project matches the actual PLC station address.

Replace or reseat the communication cable. Correct any address mismatches in the WinCC flexible project and re-transfer. Ensure bus termination resistors are active only at the physical ends of the bus segment.

Project transfer from WinCC flexible fails or times out

Check the transfer cable connection between the PC and the panel. Confirm the panel is in transfer mode (accessible via the Start Center or by holding the appropriate key combination during boot).

Restart the panel and re-enter transfer mode manually. Try a different transfer cable or USB-to-serial adapter. Ensure the correct COM port and transfer settings are selected in WinCC flexible.

Function keys do not respond to operator input

Check whether the panel is in a locked or protected state due to a configured operator authorization level. Inspect the keypad membrane for physical damage or contamination.

Verify operator authorization settings in the project configuration. If the keypad membrane is damaged, the panel front unit may need to be replaced. Clean the keypad area if contamination is suspected.

Alarms are not displayed or acknowledged correctly

Review the alarm configuration in WinCC flexible to confirm alarm triggers and acknowledgment groups are correctly defined. Check PLC bit addresses linked to alarm events.

Correct any misconfigured alarm bit addresses in the project and re-transfer. Ensure the PLC program is correctly setting and resetting the alarm trigger bits as intended.

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