Siemens 6AV6355-1CA47-7EQ2 OP 77B

€ 340,63

SKU: 6AV6355-1CA47-7EQ2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7EQ2 is an OP 77B operator panel belonging to the SIMATIC HMI Basic Panels product family. It is a compact, key-operated operator panel designed for straightforward machine-level human-machine interface tasks, providing alphanumeric display and function key input without a touchscreen. This unit is part of Siemens' established SIMATIC HMI portfolio and is engineered for integration into control cabinets and machine panels.

The OP 77B features a monochrome STN LCD display with a resolution of 160 x 64 pixels, capable of displaying text and simple graphics. It is equipped with an MPI/PROFIBUS DP interface for direct communication with SIMATIC S7 PLCs, as well as a serial RS-422/RS-485 interface for connectivity to third-party controllers. The panel includes a membrane keypad with numeric and function keys, onboard flash memory for project storage, and operates from a 24 V DC supply. Configuration is performed using Siemens WinCC flexible software.

The OP 77B is commonly deployed in manufacturing automation, machine building, and process control applications where a cost-effective, robust operator interface is required. It is well suited for environments where simple parameter display, setpoint entry, and alarm acknowledgment are the primary HMI requirements. Typical installations include packaging machinery, conveyor systems, and general-purpose industrial machines where a full graphical touchscreen panel is not necessary.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 64 pixels
Display Size	4 lines of text
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.5 W
Communication Interface	MPI/PROFIBUS DP, RS-422/RS-485
Memory	512 KB flash (user memory)
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
IP Rating (Rear)	IP20
Mounting	Panel mounting
Certifications	CE, UL, cULus
Configuration Software	WinCC flexible 2008 or higher

Common Error Codes and System Events

Event ID: 10000: Configuration error: The project loaded on the panel is incompatible or corrupted.
Reload the project using WinCC flexible. Verify the project was compiled without errors before transferring.
Event ID: 10001: No project found on the device. The panel has started without a valid configuration.
Transfer a valid compiled project to the panel via MPI or serial connection using WinCC flexible.
Event ID: 20000: Communication error: Connection to the PLC has been lost or cannot be established.
Check MPI/PROFIBUS DP cabling and termination resistors. Verify the PLC address settings match the panel configuration.
Event ID: 20001: PLC not responding: The configured PLC address is not reachable on the network.
Confirm the PLC is powered and running. Check bus address settings on both the panel and the PLC. Inspect cable integrity.
Event ID: 40000: System memory low: Available memory for runtime operation is insufficient.
Reduce the project size by removing unused screens or tags. Reload the optimized project to the panel.
Event ID: 50000: Operating system error: An internal system fault has occurred during runtime.
Perform a power cycle on the panel. If the fault persists, perform a factory reset and reload the project.
Event ID: 60000: Transfer mode active: The panel is waiting for a project transfer from the configuration PC.
Transfer the project from WinCC flexible, or press the appropriate key combination to exit transfer mode and resume normal operation.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B?

The OP 77B is primarily designed for use with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It also supports connectivity to third-party controllers via the RS-422/RS-485 serial interface using standard protocols.

What software is required to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are compiled in WinCC flexible and transferred to the panel via MPI, PROFIBUS DP, or serial connection.

What is the supply voltage for the 6AV6355-1CA47-7EQ2?

The panel requires a 24 V DC power supply. Ensure the supply is within the permissible voltage tolerance range as specified in the device manual.

Does the OP 77B support recipe management or data logging?

The OP 77B supports basic recipe management functions. However, its onboard memory and processing capabilities are limited compared to higher-tier SIMATIC HMI panels, so complex data logging applications are not recommended for this device.

What is the front panel protection rating of the OP 77B?

The front panel of the OP 77B carries an IP65 protection rating, making it suitable for installation in environments where dust and water jets may be present.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel power connector. Verify polarity and measure actual voltage under load. Inspect the internal fuse if accessible.

Ensure the power supply is within the 24 V DC specification and correctly wired. Replace the power supply or repair wiring if voltage is absent or out of range.

Panel shows 'No project' or starts in transfer mode unexpectedly

The onboard flash memory may have been erased or the project transfer was interrupted, leaving no valid project on the device.

Reconnect the configuration PC running WinCC flexible and transfer a fully compiled project to the panel via MPI or serial interface. Ensure the transfer completes without interruption.

Communication fault displayed; PLC connection not established

Verify MPI or PROFIBUS DP bus cabling between the panel and PLC. Check that bus termination resistors are correctly placed at both ends of the bus. Confirm address settings in the panel project match the PLC configuration.

Correct any wiring faults, ensure proper bus termination, and align the PLC address in the WinCC flexible project with the actual PLC station address. Reload the project if address changes are made.

Function keys do not respond or produce incorrect actions

The membrane keypad may be damaged, or the project configuration may have incorrect key assignments. Test each key systematically and compare behavior against the project's key mapping.

If the project key assignments are incorrect, reconfigure and reload the project. If physical key damage is confirmed, the membrane keypad assembly may need to be replaced.

Panel display shows corrupted characters or flickering

This may indicate a failing display backlight, a loose display ribbon cable connection, or an incompatible project configuration causing display buffer errors.

Inspect internal ribbon cable connections if the unit is open for repair. If the backlight is failing, the display assembly should be replaced. Reload the project to rule out software-related display issues.

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