Siemens 6AV6520-0AA05-2BB0 SIMATIC OP 55

Name: Siemens 6AV6520-0AA05-2BB0 SIMATIC OP 55
Brand: Siemens
SKU: 6AV6520-0AA05-2BB0
Price: 346.00 EUR
Availability: InStock

€ 346,00

Condition

Clear

SKU: 6AV6520-0AA05-2BB0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6520-0AA05-2BB0 is an operator panel belonging to the SIMATIC OP 55 series, manufactured by Siemens as part of its SIMATIC HMI product line. This unit is a compact, text-based operator panel designed for machine-level human-machine interface applications, providing operators with a straightforward means of monitoring and controlling industrial processes. It is part of the classic SIMATIC HMI portfolio, intended for integration with Siemens SIMATIC S5 and S7 programmable logic controllers.

The OP 55 features a multi-line LCD text display capable of showing alphanumeric characters and status messages, with dedicated function keys and a membrane keypad for operator input. The panel supports serial communication interfaces, including TTY and RS-232, enabling connectivity to SIMATIC PLCs and other compatible controllers. It operates on a 24 V DC supply and is designed for panel mounting with a defined cutout, offering a compact footprint suitable for control cabinet door installation. Configuration is performed using the ProTool software package, allowing engineers to define messages, alarms, and process values.

The SIMATIC OP 55 is widely used in manufacturing, machine building, and process automation environments where a cost-effective, reliable text-based operator interface is required. It is commonly found on packaging machines, conveyor systems, and general-purpose industrial machinery where simple status display and operator input functions are sufficient. Its compatibility with the established SIMATIC S5 and S7 controller families makes it a practical choice for both new installations and legacy system maintenance.

Technical Specifications

Display Type	LCD text display
Display Lines	4 lines
Characters per Line	20 characters
Input/Operating Voltage	24 V DC
Communication Interface	TTY (20 mA), RS-232
Keypad	Membrane keypad with function keys
Mounting	Panel mounting (flush)
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90%, non-condensing
IP Rating (Front)	IP 65
Configuration Software	ProTool
PLC Compatibility	SIMATIC S5, SIMATIC S7
Certifications	CE, UL

Common Error Codes & System Events

System Error 1: Communication error between the OP 55 and the connected PLC. The connection has been interrupted or cannot be established.
Check the serial communication cable and connections. Verify the PLC address and baud rate settings match the OP 55 configuration. Restart both devices.
System Error 2: Configuration data in the operator panel is invalid or corrupted.
Reload the project configuration to the OP 55 using ProTool. Ensure the correct project file is transferred and verify the download completes without errors.
System Error 3: Internal memory error detected during self-test at startup.
Perform a complete reset of the operator panel and reload the configuration. If the error persists, the internal memory or hardware may be faulty and the unit should be repaired or replaced.
System Error 4: Watchdog timeout — the panel's internal watchdog has triggered due to a software or communication hang.
Cycle power to the OP 55. Check for excessive noise on the communication line and verify cable shielding. If the fault recurs, reload the firmware and configuration.
Alarm Buffer Full: The alarm buffer has reached its maximum capacity and new alarms cannot be logged.
Acknowledge and clear existing alarms from the alarm list. Review the alarm configuration in ProTool to ensure alarm classes are correctly defined and buffer size is appropriate.
No Project: No valid project or configuration has been loaded into the operator panel.
Connect the OP 55 to a PC running ProTool and download a valid project configuration to the device. Verify the project is compatible with the OP 55 hardware version.
PLC Not Responding: The OP 55 cannot receive a response from the connected PLC within the defined timeout period.
Check power supply to the PLC, verify communication cable integrity, and confirm that the PLC is in RUN mode. Check baud rate and station address settings on both devices.

Frequently Asked Questions

What PLC families are compatible with the SIMATIC OP 55 (6AV6520-0AA05-2BB0)?

The OP 55 is compatible with Siemens SIMATIC S5 and SIMATIC S7 PLC families via TTY (20 mA current loop) and RS-232 serial interfaces. The specific protocol and connection type must be configured in the ProTool software.

What software is used to configure the OP 55?

The OP 55 is configured using Siemens ProTool, which allows engineers to create operator screens, define alarm messages, and configure communication parameters. The project is then downloaded to the panel via a serial connection.

What is the supply voltage for the 6AV6520-0AA05-2BB0?

The OP 55 operates on a 24 V DC supply voltage, which is the standard supply used across the SIMATIC HMI classic panel range.

What is the front panel protection rating of the OP 55?

The front panel of the OP 55 is rated to IP 65, providing protection against dust ingress and low-pressure water jets, making it suitable for installation in industrial control cabinet doors.

Can the OP 55 display graphics or only text?

The OP 55 is a text-based operator panel and displays alphanumeric characters only. It does not support graphical displays or bitmap images; for graphical HMI functionality, a higher-tier SIMATIC panel such as the TP or MP series would be required.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Check the supply cable and any inline fuses or circuit breakers in the control cabinet.

Restore the 24 V DC supply to within specification. If the supply is correct and the display remains blank, the internal power supply or display backlight may be faulty and the unit should be inspected for repair or replacement.

'PLC Not Responding' or communication error displayed on screen

Inspect the serial communication cable between the OP 55 and the PLC for damage or loose connections. Verify that the baud rate, parity, and station address settings in the OP 55 project match the PLC configuration.

Replace or reseat the communication cable. Correct any mismatched communication parameters in ProTool and re-download the project. Ensure the PLC is powered and in RUN mode.

Panel displays 'No Project' message on startup

The operator panel has lost its configuration, which can occur after a firmware update, memory fault, or if the panel has been reset to factory defaults.

Connect the OP 55 to a PC with ProTool installed, open the correct project file, and perform a full download to the panel. Verify the download completes successfully before disconnecting.

Function keys do not respond to operator input

Test each function key systematically. Check whether the issue is with all keys or specific keys, which may indicate a membrane keypad failure or a configuration issue in the project.

If the keypad is physically damaged or worn, the membrane keypad assembly should be replaced. If the keys are functional but not triggering the expected actions, review the key assignments in the ProTool project and re-download the configuration.

Alarm messages are not displayed or are displayed incorrectly

Check the alarm configuration in the ProTool project, including alarm text, trigger bit addresses, and alarm class settings. Verify that the PLC is writing to the correct alarm bit addresses.

Correct any mismatched bit addresses or alarm text entries in ProTool and re-download the project. Confirm PLC logic is activating the correct alarm bits and that the alarm buffer is not full.

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