Siemens 6AV6321-1CA33-1CY0 SIMATIC OP 33

Name: Siemens 6AV6321-1CA33-1CY0 SIMATIC OP 33
Brand: Siemens
SKU: 6AV6321-1CA33-1CY0
Price: 1995.00 EUR
Availability: InStock

€ 1.995,00

Condition

Clear

SKU: 6AV6321-1CA33-1CY0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6321-1CA33-1CY0 is an Operator Panel (OP 33) belonging to the SIMATIC HMI family, designed for human-machine interface applications in industrial automation environments. This unit provides a robust operator interface with a built-in display and function keys, enabling operators to monitor and control machine processes directly. It is part of Siemens' established SIMATIC HMI panel range, engineered for reliable operation in demanding industrial settings.

The OP 33 features a monochrome LCD display with a resolution suitable for text and simple graphics-based process visualization. It supports communication via the MPI (Multi-Point Interface) and PROFIBUS DP protocols, allowing direct integration with Siemens S7-300 and S7-400 PLCs. The panel includes configurable function keys and a membrane keypad for operator input, and is configured using Siemens ProTool or WinCC flexible engineering software. The unit operates on a 24 V DC supply and is built to meet industrial EMC and environmental standards.

The SIMATIC OP 33 is widely used in machine building, manufacturing automation, and process control applications where a compact, keypad-operated HMI is required. It is particularly suited for panel-mount installations in control cabinets on packaging machines, conveyor systems, and general-purpose industrial machinery. Its compatibility with the S7 PLC family makes it a common choice for system integrators working within the Siemens automation ecosystem.

Technical Specifications

Display Type	Monochrome LCD
Input Voltage	24 V DC
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
Mounting	Panel mount
Engineering Software	ProTool, WinCC flexible
PLC Compatibility	SIMATIC S7-300, S7-400
Series	SIMATIC HMI OP 33
Certifications	CE, UL

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 address settings match configuration.
Event ID: 10001: No connection to configured PLC partner at startup.
Confirm PLC address and baud rate settings in ProTool/WinCC flexible project match the physical PLC configuration. Check cable integrity.
Event ID: 20000: Project download error — incompatible or corrupted project data detected.
Re-download the project from the engineering PC using ProTool or WinCC flexible. Ensure software version compatibility between project and panel firmware.
Event ID: 40000: Internal device error or hardware fault detected.
Perform a panel reset. If the fault persists, check the 24 V DC supply voltage and inspect the unit for physical damage. Contact Siemens support or arrange repair.
Event ID: 50000: Memory overflow — project data exceeds available panel memory.
Reduce the project size by removing unused screens, tags, or graphics. Reload the optimized project to the panel.
Event ID: 60000: Firmware version mismatch between panel and engineering software.
Update the panel firmware to the version required by the ProTool or WinCC flexible project, or adjust the project target version accordingly.
Event ID: 70000: Keypad or membrane key input fault detected.
Inspect the membrane keypad for physical damage or contamination. If keys are unresponsive, the keypad assembly may require replacement.

Frequently Asked Questions

Which PLCs is the SIMATIC OP 33 (6AV6321-1CA33-1CY0) compatible with?

The OP 33 is compatible with Siemens SIMATIC S7-300 and S7-400 PLCs via MPI or PROFIBUS DP communication interfaces. It can also communicate with S5 PLCs using appropriate protocol adapters.

What engineering software is used to configure the OP 33?

The OP 33 is configured using Siemens ProTool or WinCC flexible engineering software. Projects are downloaded to the panel via an MPI connection from the engineering PC.

What is the supply voltage for the 6AV6321-1CA33-1CY0?

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

What is the front panel protection rating of the OP 33?

The OP 33 provides IP65 protection at the front panel when correctly installed in a panel cutout, making it suitable for environments with dust and water spray.

Can the OP 33 be used with WinCC flexible on modern engineering PCs?

Yes, WinCC flexible supports the OP 33 as a target device, though users should verify software version compatibility. ProTool was the original configuration tool for this panel generation.

Troubleshooting

Panel display remains blank after power on

Measure the 24 V DC supply voltage at the panel power connector. Check for blown internal fuse or wiring fault at the supply terminals.

Restore correct 24 V DC supply. Replace the internal fuse if blown. If the display remains blank with correct supply voltage, the internal power supply or display unit may require repair or replacement.

No communication with S7 PLC via MPI

Verify MPI cable connections at both the panel and PLC. Check that the MPI address configured in the project matches the panel's set address. Confirm bus termination is correctly applied at both ends of the MPI segment.

Correct any address mismatches in the ProTool or WinCC flexible project. Replace damaged MPI cable. Ensure only the two physical end nodes on the MPI bus have termination resistors enabled.

Project download fails from engineering PC

Check the MPI cable connection between the PC adapter and the OP 33. Verify that the correct COM port and baud rate are selected in the transfer settings of ProTool or WinCC flexible.

Use a known-good PC-MPI adapter cable. Set the correct baud rate (typically 187.5 kbps for MPI download). Restart both the engineering PC software and the panel before retrying the download.

Function keys not responding to operator input

Inspect the membrane keypad surface for physical damage, contamination, or deformation. Test each key systematically using a diagnostic screen if available in the project.

Clean the keypad surface with a dry cloth. If keys remain unresponsive, the membrane keypad assembly is likely worn or damaged and should be replaced with a compatible spare part.

Panel repeatedly restarts or enters boot loop

Check the 24 V DC supply for voltage fluctuations or ripple using a multimeter or oscilloscope. Inspect the project data integrity by attempting a fresh project download.

Stabilize the power supply, ensuring it meets the 24 V DC specification with adequate current capacity. Re-download the project to rule out corrupted firmware or project data as the cause of the restart loop.

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