Siemens 6AV6355-1CA47-7EK2 OP 77B

€ 764,03

SKU: 6AV6355-1CA47-7EK2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7EK2 is an operator panel belonging to the OP 77B series within the Siemens SIMATIC HMI product family. This compact panel operator unit is designed for machine-level human-machine interface applications, providing a text-based display with integrated function keys for direct operator interaction. It is part of the SIMATIC HMI Basic Panels generation and is intended for use in environments where a cost-effective, reliable HMI solution is required.

The OP 77B features a monochrome STN LCD display capable of showing text and simple graphics, with a resolution of 160 x 32 pixels. It supports communication via MPI and PROFIBUS DP interfaces, enabling direct integration with Siemens S7-200, S7-300, and S7-400 PLCs without an additional communication module. The panel is configured using Siemens WinCC flexible software and supports recipe management, alarm logging, and trend display functions within its operational scope. It operates on a 24 V DC supply and is rated IP65 on the front face for protection against dust and water ingress.

The OP 77B is widely deployed in machine building, packaging machinery, conveyor systems, and general factory automation where a straightforward text-based operator interface is sufficient. Its compact form factor and panel-mount design make it suitable for integration into control cabinet doors and machine enclosures with limited space. The robust construction and wide operating temperature range allow reliable operation in industrial production environments.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 32 pixels
Number of Lines	4 lines of text
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.5 W
Communication Interface	MPI, PROFIBUS DP
IP Rating (Front)	IP65
IP Rating (Rear)	IP20
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90%, non-condensing
Mounting	Panel mounting
Configuration Software	WinCC flexible 2005 or higher
Certifications	CE, UL, cULus

Common Error Codes and System Events

Event ID: 1000: No connection to PLC. The HMI panel cannot establish communication with the configured controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify PLC address settings match the HMI project configuration. Confirm the PLC is powered and in RUN mode.
Event ID: 1003: Communication timeout to PLC. The connection was established but data exchange has been interrupted.
Inspect cable integrity and connector seating. Check for bus conflicts or address duplicates on the MPI/PROFIBUS network. Reduce bus length or check termination if necessary.
Event ID: 10000: Project download error. The configuration project could not be transferred to the panel successfully.
Verify the PC-to-panel transfer cable is correctly connected. Ensure WinCC flexible project is compiled without errors before transfer. Check that the panel is in transfer mode.
Event ID: 10001: Incompatible project version. The project loaded on the panel was created with an incompatible version of WinCC flexible.
Recompile and re-download the project using a compatible version of WinCC flexible. Update panel firmware if required.
Event ID: 20000: System memory low. The panel's available working memory is insufficient to execute the current project.
Reduce the number of active alarms, recipes, or trend buffers in the project. Simplify the project configuration and re-download.
Event ID: 40000: Hardware fault detected. An internal hardware error has been identified on the panel.
Perform a panel restart. If the fault persists, the unit may require repair or replacement. Contact Siemens technical support or a qualified repair facility.
Event ID: 2521: Alarm buffer overflow. The number of pending alarms exceeds the panel's alarm buffer capacity.
Acknowledge and clear existing alarms on the panel. Review the alarm configuration in WinCC flexible to reduce the number of simultaneous alarm triggers.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B panel?

The OP 77B is compatible with Siemens S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with S7-200 via the PPI protocol depending on configuration.

What software is used to configure the 6AV6355-1CA47-7EK2?

The panel is configured using Siemens WinCC flexible 2005 or later versions. The project is transferred to the panel via a PC adapter cable connected to the MPI interface.

What is the supply voltage for this operator panel?

The OP 77B operates on a 24 V DC supply voltage. Ensure the power supply is within the specified tolerance range to avoid operational faults.

Is the OP 77B front panel rated for wash-down or dusty environments?

The front face of the OP 77B carries an IP65 protection rating, making it suitable for environments with dust and water spray. The rear of the unit is rated IP20 and must be protected accordingly.

Can the OP 77B display graphics or only text?

The OP 77B is primarily a text-based operator panel with a monochrome LCD display at 160 x 32 pixel resolution. It can display simple bar graphs and symbols in addition to text, but it is not suited for complex graphical applications.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel power connector. Verify polarity is correct. Inspect the internal fuse if accessible.

Ensure the power supply output is within the 24 V DC tolerance range. Replace the supply or wiring if voltage is absent or incorrect. If the supply is confirmed good and the display remains blank, the panel may require internal repair.

Panel shows 'No connection to PLC' message continuously

Verify the MPI or PROFIBUS DP cable is correctly connected at both the panel and PLC ends. Check that bus termination resistors are enabled at both ends of the network segment. Confirm the PLC node address in the HMI project matches the physical PLC setting.

Replace or reseat the communication cable. Correct any address conflicts on the bus. Enable termination on the first and last devices on the PROFIBUS or MPI segment. Re-download the project if address settings were changed.

Project transfer from PC to panel fails

Confirm the panel is set to transfer mode by navigating to the panel's loader menu. Check that the correct COM port and transfer speed are selected in WinCC flexible. Inspect the PC adapter cable for damage.

Place the panel in transfer mode before initiating the download. Use a known-good PC adapter cable (e.g., Siemens PC Adapter USB). Ensure WinCC flexible project compiles without errors prior to transfer.

Function keys do not respond to presses

Check whether the panel is in normal operating mode and not locked. Verify the project configuration assigns actions to the function keys in WinCC flexible. Inspect the keypad membrane for physical damage or contamination.

Unlock the panel if a key lock is active. Re-download the project with correct function key assignments. If keys are physically damaged or unresponsive due to membrane wear, the panel keypad assembly may need replacement.

Alarm messages appear in incorrect language or with garbled text

Check the language settings in the WinCC flexible project and confirm the correct language is activated on the panel. Verify that the alarm text strings are correctly entered in the project for the selected language.

Set the correct active language in the WinCC flexible project and re-download to the panel. Ensure all alarm text fields are populated for the target language and that the character set is compatible with the panel's display capabilities.

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