Siemens 6AV6520-0CA05-2AC0 SIMATIC OP 55

Name: Siemens 6AV6520-0CA05-2AC0 SIMATIC OP 55
Brand: Siemens
SKU: 6AV6520-0CA05-2AC0
Price: 547.00 EUR
Availability: InStock

€ 547,00

Condition

Clear

SKU: 6AV6520-0CA05-2AC0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6520-0CA05-2AC0 is an operator panel belonging to the SIMATIC OP 55 series, part of Siemens' SIMATIC HMI product line. It 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. This unit is a refurbished or replacement-grade component commonly used in legacy automation systems that rely on the SIMATIC HMI operator panel family.

The OP 55 features a multi-line LCD text display capable of showing alphanumeric characters and system messages, enabling clear communication of process states and alarms. It supports serial communication interfaces, typically RS-232 and RS-422/485, allowing integration with SIMATIC S5 and S7 PLCs as well as third-party controllers via standard protocols. The panel includes a membrane keypad with function keys for operator input, and is designed for panel-mount installation in control cabinet doors. Configuration is performed using ProTool software, and the unit supports recipe management and alarm logging within its onboard memory.

The SIMATIC OP 55 is widely deployed in manufacturing, packaging, and process automation environments where a cost-effective, reliable text-based HMI is required. It is particularly suited for retrofitting or maintaining existing SIMATIC S5-era control systems, as well as S7-based installations requiring a simple operator interface. Industries such as food and beverage, automotive assembly, and general machine building commonly utilize this panel for local operator interaction at the machine level.

Technical Specifications

Display Type	LCD text display
Display Lines	4 lines
Characters per Line	20 characters
Input/Operating Voltage	24 V DC
Communication Interface	RS-232, RS-422/RS-485
PLC Compatibility	SIMATIC S5, SIMATIC S7
Configuration Software	ProTool
Mounting	Panel mount (flush mounting)
Protection Rating (Front)	IP 65
Protection Rating (Rear)	IP 20
Operating Temperature	0 °C to 50 °C
Storage Temperature	-20 °C to 60 °C
Relative Humidity	10 % to 90 % (non-condensing)
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 10000: Communication error between the OP 55 and the connected PLC. The panel cannot establish or maintain a connection to the controller.
Check the serial cable connections and wiring between the OP 55 and the PLC. Verify the communication parameters (baud rate, parity, stop bits) match on both devices. Inspect the cable for damage and replace if necessary.
Event ID: 10001: Timeout error on the communication link. The PLC did not respond within the expected time window.
Verify the PLC is powered and in RUN mode. Check for loose or broken serial connections. Reduce cable length or check for electromagnetic interference on the communication line.
Event ID: 10002: Configuration data error. The project data loaded on the OP 55 is inconsistent or corrupted.
Reload the project from ProTool to the operator panel. Ensure the correct project version is being transferred and that the transfer is completed without interruption.
Event ID: 10003: Memory overflow or insufficient memory for the current project or recipe data.
Reduce the size of the project, alarm list, or recipe data. Delete unused entries and retransfer the project to the panel.
Event ID: 10004: Operating voltage out of range. The supply voltage to the OP 55 has dropped below or exceeded the permissible limits.
Measure the 24 V DC supply at the panel's power connector. Ensure the power supply unit is functioning correctly and that the supply voltage is within the specified range.
Event ID: 10005: Alarm buffer overflow. The number of pending or logged alarms has exceeded the buffer capacity.
Acknowledge and clear existing alarms on the panel. Review the alarm configuration in ProTool and reduce the number of simultaneous alarm entries if necessary.
Event ID: 10006: Recipe data transfer error. A recipe could not be written to or read from the connected PLC.
Check the PLC data block addresses configured for recipe transfer. Ensure the PLC program has the correct data blocks allocated and that the communication link is stable.

Frequently Asked Questions

What PLCs are compatible with the SIMATIC OP 55 (6AV6520-0CA05-2AC0)?

The OP 55 is compatible with Siemens SIMATIC S5 and SIMATIC S7 PLCs via serial communication interfaces (RS-232 and RS-422/485). It can also communicate with third-party controllers that support standard serial protocols.

What software is used to configure the OP 55?

The OP 55 is configured using Siemens ProTool software. Projects are created on a PC and then transferred to the panel via a serial connection.

What is the supply voltage required for the 6AV6520-0CA05-2AC0?

The OP 55 requires a 24 V DC supply voltage. Ensure the power source is within the specified tolerance range to avoid communication or operational errors.

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

The front panel of the OP 55 carries an IP 65 protection rating, making it suitable for installation in environments where dust and water spray may be present.

Can the OP 55 be used as a replacement for older SIMATIC operator panels in existing installations?

Yes, the OP 55 is commonly used as a replacement in legacy SIMATIC installations. Compatibility with the existing PLC type and communication protocol should be verified before installation, and the project may need to be retransferred using ProTool.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the power connector of the OP 55. Check for blown internal fuses or a faulty power supply unit feeding the panel.

Restore the supply voltage to within the specified 24 V DC range. Replace the external power supply if it is not delivering the correct voltage. If the internal fuse is blown, inspect for short circuits before replacing.

Panel displays communication error or no connection to PLC

Inspect the serial communication cable between the OP 55 and the PLC for damage, loose connectors, or incorrect wiring. Verify that the baud rate, parity, and stop bit settings match on both the panel and the PLC.

Replace or reseat the communication cable. Correct the communication parameters in the ProTool project and retransfer to the panel. Ensure the PLC is in RUN mode and the correct communication driver is selected.

Operator keys are unresponsive or intermittently responsive

Inspect the membrane keypad for physical damage, contamination, or wear. Check the internal ribbon cable connection between the keypad and the main PCB.

Clean the keypad surface with a dry cloth. If the ribbon cable is loose or damaged, reseat or replace it. If the keypad membrane is worn through, the front panel assembly may need replacement.

Project transfer from ProTool fails or is incomplete

Check the serial transfer cable connection between the PC and the OP 55. Verify that the panel is set to transfer mode and that the correct COM port and transfer settings are selected in ProTool.

Reseat the transfer cable and retry the download. Ensure the ProTool software version is compatible with the OP 55 firmware. If transfer repeatedly fails, perform a factory reset on the panel and retry the project transfer.

Alarms are not displayed or alarm messages appear corrupted

Review the alarm configuration in the ProTool project to confirm that alarm addresses correspond to the correct PLC data areas. Check the communication link stability between the panel and the PLC.

Correct the alarm address assignments in ProTool and retransfer the project. Ensure the PLC program is writing alarm bits to the correct memory locations. Stabilize the communication link by checking cable integrity and grounding.

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