Siemens 6AV6355-1CA47-7EA0 OP 77B

€ 503,40

SKU: 6AV6355-1CA47-7EA0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7EA0 is an operator panel belonging to the OP 77B series within the Siemens SIMATIC HMI product family. This unit is a compact, key-operated panel designed for machine-level human-machine interface applications, providing operators with a straightforward interface for monitoring and controlling automated processes. The OP 77B series is part of the broader SIMATIC HMI Basic Panels generation and is engineered for reliable operation in industrial environments.

The OP 77B features a monochrome STN LCD display and a membrane keypad with function keys, system keys, and numeric entry keys, enabling structured operator input without a touchscreen. It supports MPI and PROFIBUS DP communication interfaces for direct integration with Siemens S7-200, S7-300, and S7-400 PLCs, as well as compatibility with the SIMATIC WinCC flexible configuration software. The panel includes internal flash memory for project storage and operates on a 24 V DC supply, with a robust housing suited for front-panel mounting.

The OP 77B is widely deployed in manufacturing, packaging, and process automation applications where a cost-effective, durable operator interface is required at the machine level. Its compatibility with the SIMATIC S7 controller family makes it a natural fit for existing Siemens automation architectures. The panel is particularly suited for applications requiring simple setpoint entry, status display, and alarm acknowledgment without the complexity of a full graphical touchscreen HMI.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
Permissible Voltage Range	19.2 – 28.8 V DC
Power Consumption	Approx. 4 W
Communication Interface	MPI, PROFIBUS DP
Configuration Software	SIMATIC WinCC flexible 2005 or higher
Memory	512 KB internal flash (user project)
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 mounting (front-panel cutout)
Certifications	CE, UL, cULus
Series	SIMATIC HMI OP 77B

Common Error Codes & System Events

Event ID: 10000: Configuration error detected on startup; the loaded project is incompatible or corrupt.
Re-transfer the project from WinCC flexible to the panel. Verify the project was compiled without errors before transfer.
Event ID: 10001: Communication link to the configured PLC controller has failed or cannot be established.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration.
Event ID: 20000: System memory low; available memory for runtime operation is insufficient.
Reduce the project size by removing unused screens, tags, or alarm entries. Re-transfer the optimized project to the panel.
Event ID: 30000: Tag read/write error; the panel cannot access a configured PLC data address.
Verify the PLC data block or memory address referenced in the tag configuration exists and is accessible. Check PLC program for address changes.
Event ID: 40000: Alarm buffer overflow; the number of pending alarms exceeds the buffer capacity.
Acknowledge and clear active alarms on the panel. Review the alarm configuration to reduce simultaneous alarm triggers.
Event ID: 50000: Operating system or firmware error detected during self-test at startup.
Perform a panel reset by cycling power. If the error persists, re-flash the panel firmware using the appropriate Siemens ProSave tool.
Event ID: 60000: Transfer mode active; panel is waiting for a project download from the engineering PC.
This is a status event, not a fault. Initiate the project transfer from WinCC flexible, or press ESC on the panel to exit transfer mode and resume normal operation.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B (6AV6355-1CA47-7EA0)?

The OP 77B is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It also supports communication with S7-1200 in certain configurations using appropriate drivers in WinCC flexible.

What software is required to configure and program this panel?

The panel is configured using Siemens SIMATIC WinCC flexible 2005 or a later version. Projects are transferred to the panel via MPI, PROFIBUS DP, or a USB-to-MPI adapter cable.

What is the supply voltage for the 6AV6355-1CA47-7EA0?

The panel operates on 24 V DC with a permissible range of 19.2 V DC to 28.8 V DC. A regulated 24 V DC power supply is required.

Does the OP 77B support touchscreen input?

No, the OP 77B uses a membrane keypad with function keys, system keys, and a numeric keypad. It does not have a touchscreen display.

What is the front panel protection rating of this unit?

The OP 77B provides IP65 protection at the front panel when correctly installed in a panel cutout, making it suitable for environments with dust and water spray exposure.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Check that the voltage is within the 19.2–28.8 V DC range. Inspect the supply cable and connector for damage.

Correct the supply voltage if out of range. If voltage is correct and the display remains blank, the internal power supply or backlight may have failed; the unit should be sent for repair or replacement.

Panel displays 'No connection to PLC' or communication error on startup

Check the MPI or PROFIBUS DP cable connections at both the panel and PLC ends. Verify bus termination is correctly applied at both ends of the network segment. Confirm the PLC station address and baud rate in the panel project match the actual PLC settings.

Reseat or replace the communication cable. Correct the station address and baud rate in the WinCC flexible project and re-transfer. Ensure only the two physical end nodes on the bus have termination resistors enabled.

Project transfer from engineering PC fails or times out

Verify the transfer cable (MPI or USB-to-MPI adapter) is correctly connected and the appropriate driver is installed on the PC. Confirm the panel is in transfer mode (Transfer button visible on the start screen).

Place the panel in transfer mode manually via the Start Center menu. Reinstall the PC adapter driver if necessary. Try a different USB port or cable. Ensure the baud rate in WinCC flexible transfer settings matches the panel configuration.

Function keys do not respond or produce incorrect actions

Check whether the panel project has function key assignments correctly configured in WinCC flexible. Test if the issue occurs on all screens or only specific ones, which may indicate a project configuration error rather than a hardware fault.

Review and correct function key assignments in the WinCC flexible project and re-transfer. If keys are unresponsive on all screens and the project is verified correct, the membrane keypad may be worn or damaged and requires hardware replacement.

Alarms are not displayed or acknowledged correctly

Check the alarm configuration in the WinCC flexible project, including the PLC bit addresses assigned to alarm triggers. Verify the PLC program is writing to the correct memory addresses. Confirm the alarm view object is present on the relevant HMI screen.

Correct any mismatched PLC addresses in the alarm configuration and re-transfer the project. Ensure the PLC program logic correctly sets and resets alarm trigger bits. Test alarm triggering by manually forcing the relevant PLC bits.

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