Siemens 6AV6355-1CA47-7DC4 OP 77B

€ 2.070,40

SKU: 6AV6355-1CA47-7DC4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7DC4 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 human-machine interface applications, providing a keypad-based interface for machine monitoring and control. It is part of the Siemens SIMATIC HMI Basic Panels generation, intended for straightforward visualization and operator input tasks in industrial environments.

The OP 77B features a monochrome STN LCD display and a membrane keypad with function keys, system keys, and numeric/alphanumeric input capability. It supports MPI and PROFIBUS DP communication interfaces for integration with Siemens SIMATIC S7 PLCs, as well as point-to-point serial communication. The unit operates on 24 V DC supply voltage and is built to withstand industrial conditions, carrying a front panel IP65 protection rating. Configuration is performed using Siemens WinCC flexible or STEP 7 Micro/WIN engineering software.

The OP 77B panel is widely used in machine building, manufacturing automation, and process control applications where a cost-effective, robust operator interface is required. It is particularly suited for integration with Siemens S7-200, S7-300, and S7-400 PLC systems. Typical deployment environments include packaging machinery, conveyor systems, and general-purpose industrial machines requiring local operator control and status display.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
Voltage Range	19.2 – 28.8 V DC
Communication Interface	MPI, PROFIBUS DP, RS-422/485 (PtP)
IP Protection Rating (Front)	IP65
IP Protection Rating (Rear)	IP20
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10 – 90 % (non-condensing)
Mounting	Panel mounting
Certifications	CE, UL, cULus
Series/Product Family	SIMATIC HMI OP 77B

Common Error Codes & System Events

Event ID: 10000: Configuration error detected on startup; the loaded project is incompatible or corrupt.
Reload the project using WinCC flexible. Verify the project was compiled for the correct panel type and transfer again.
Event ID: 20000: Communication connection to the configured PLC 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: 40000: Operating system error; internal system fault detected.
Perform a panel reset. If the fault persists, reload the firmware using ProSave and then retransfer the project.
Event ID: 50000: Transfer mode active; panel is waiting for a project download from the engineering PC.
Initiate the project transfer from WinCC flexible on the connected PC, or cancel transfer mode to resume normal operation.
Event ID: 60000: Memory card error; inserted memory card is not recognized or is faulty.
Remove and reinsert the memory card. Replace the card if the error persists. Ensure the card is formatted correctly and compatible with the OP 77B.
Event ID: 70000: Firmware update required; installed firmware version is incompatible with the loaded project.
Use ProSave to update the panel firmware to the version required by the WinCC flexible project, then retransfer the project.

Frequently Asked Questions

Which PLCs are compatible with the Siemens OP 77B (6AV6355-1CA47-7DC4)?

The OP 77B is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It also supports point-to-point serial communication with select third-party controllers.

What engineering software is used to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible (Compact or Standard edition) or STEP 7 Micro/WIN for S7-200 applications. Projects are transferred to the panel via MPI cable or memory card.

What is the supply voltage for the 6AV6355-1CA47-7DC4?

The panel operates on 24 V DC with an allowable range of 19.2 V DC to 28.8 V DC. A stable, regulated 24 V DC power supply is required for reliable operation.

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 resistant to dust ingress and low-pressure water jets. The rear of the unit is rated IP20.

Can the OP 77B firmware be updated in the field?

Yes, the firmware can be updated using the Siemens ProSave tool via the MPI/PROFIBUS DP interface or through a compatible memory card. Always ensure the firmware version is compatible with the WinCC flexible project version in use.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel power connector. Check that the voltage is within the 19.2–28.8 V DC range. Inspect the internal fuse if accessible.

Correct the supply voltage if out of range. Replace the power supply if it is unstable. If the display backlight has failed, the panel may require backlight or display module replacement.

Panel cannot establish communication with the PLC

Verify the MPI or PROFIBUS DP cable is correctly connected and that bus termination resistors are properly placed at both ends of the network. Check that the PLC address and baud rate configured in the project match the physical network settings.

Correct any address or baud rate mismatches in the WinCC flexible project and retransfer. Replace the communication cable if continuity testing reveals a fault. Ensure no duplicate node addresses exist on the bus.

Panel continuously restarts or enters a boot loop

This typically indicates a corrupt or incompatible project file, or a firmware mismatch. Observe whether the panel displays any event ID during the restart cycle.

Use ProSave to restore the panel firmware to factory state, then retransfer a freshly compiled project from WinCC flexible. Ensure the project is compiled specifically for the OP 77B panel type.

Keypad buttons are unresponsive or register incorrect inputs

Inspect the membrane keypad for physical damage, contamination, or deformation. Test individual keys in the panel's built-in service menu if accessible.

Clean the keypad surface with a dry cloth. If individual keys have failed, the membrane keypad assembly will need to be replaced, as individual key repair is not typically possible.

Project transfer fails or times out during download

Check the MPI cable connection between the engineering PC and the panel. Verify the panel is in transfer mode and that the correct COM port and transfer settings are selected in WinCC flexible.

Restart both the panel in transfer mode and the WinCC flexible transfer function. Try a different MPI cable or USB-MPI adapter. Ensure no other software is occupying the COM port on the PC.

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