Siemens 6AV6355-1CA47-7EM5 OP 77B

€ 503,40

SKU: 6AV6355-1CA47-7EM5 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7EM5 is an operator panel belonging to the SIMATIC HMI OP 77B series, manufactured by Siemens. It is a compact, key-operated panel designed for human-machine interface applications in industrial automation environments. This unit provides a straightforward interface for machine monitoring and control, integrating into Siemens SIMATIC automation architectures.

The OP 77B features a monochrome STN LCD display with a resolution of 160 x 80 pixels, capable of displaying text and simple graphics. It is equipped with a membrane keypad for operator input, including function keys and system keys. The panel supports MPI and PROFIBUS-DP communication interfaces, enabling direct integration with Siemens S7-200, S7-300, and S7-400 PLCs. Configuration is performed using Siemens WinCC flexible software, and the unit operates on a 24 V DC supply voltage.

The OP 77B is typically deployed in machine-level control panels across manufacturing, packaging, and process industries. Its compact form factor and robust membrane keypad make it suitable for applications where a small footprint and reliable key-based input are required. It is commonly found on standalone machines, conveyor systems, and auxiliary control stations where basic status display and parameter entry are needed.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
Voltage Tolerance	19.2 V DC to 28.8 V DC
Power Consumption	Max. 4 W
Communication Interface	MPI, PROFIBUS-DP
Configuration Software	WinCC flexible 2005 or higher
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
Series	SIMATIC HMI OP 77B

Common Error Codes & System Events

Event ID: 10000: Communication error between the OP 77B and the connected PLC. The panel cannot establish or maintain a connection to the controller.
Check MPI or PROFIBUS-DP cable connections and termination resistors. Verify the PLC address settings match the configuration in WinCC flexible. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the PLC was interrupted during operation.
Inspect communication cables for damage or loose connectors. Check bus termination and cable shielding. Restart the panel and PLC if the connection is not automatically re-established.
Event ID: 20000: Configuration or project data on the panel is missing or corrupted.
Re-download the project from WinCC flexible to the OP 77B. Verify the project file integrity before transfer.
Event ID: 20001: Project version mismatch between the loaded project and the panel firmware.
Update the panel firmware to the version compatible with the WinCC flexible project, or re-configure the project for the installed firmware version.
Event ID: 40000: Internal device error detected. A hardware fault has been identified within the panel.
Cycle power to the panel. If the error persists, the unit may require repair or replacement of internal components.
Event ID: 50000: Power supply voltage is outside the permissible range (below 19.2 V DC or above 28.8 V DC).
Measure the supply voltage at the panel connector. Ensure the 24 V DC supply is stable and within tolerance. Check wiring and power supply unit output.
Event ID: 60000: Firmware update failed or was interrupted during the update process.
Repeat the firmware update procedure using the correct firmware file for the OP 77B. Ensure stable power supply and communication during the update.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B?

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

What software is used to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible 2005 or later versions. Projects are created on a PC and downloaded to the panel via MPI or a PC/PPI cable.

What is the supply voltage for the 6AV6355-1CA47-7EM5?

The panel requires a 24 V DC supply voltage, with an acceptable range of 19.2 V DC to 28.8 V DC.

What is the IP protection rating of the OP 77B?

The front face of the OP 77B is rated IP65, providing protection against dust and water jets. The rear of the unit is rated IP20.

Can the OP 77B display graphics or only text?

The OP 77B can display both text and simple bitmap graphics on its monochrome STN LCD. However, its 160 x 80 pixel resolution limits graphical complexity compared to larger HMI panels.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the panel's power connector. Check that the voltage is within the 19.2 V to 28.8 V range. Inspect the supply wiring for breaks or loose terminals.

Restore the supply voltage to within specification. If voltage is correct and the display remains blank, the internal power supply or display backlight may have failed, requiring panel repair or replacement.

Panel shows communication error and cannot connect to PLC

Verify MPI or PROFIBUS-DP cable connections at both the panel and PLC ends. Check that bus termination resistors are correctly placed at both ends of the bus. Confirm the PLC address and baud rate settings match the WinCC flexible project configuration.

Correct any wiring faults, replace damaged cables, and ensure proper bus termination. Update the panel project settings in WinCC flexible if address or baud rate mismatches are found, then re-download the project.

Keypad buttons are unresponsive or intermittently responsive

Inspect the membrane keypad surface for physical damage, contamination, or wear. Check for any debris lodged under the keypad overlay. Test each key systematically to identify whether the fault is isolated to specific keys or affects all keys.

Clean the keypad surface with a dry cloth. If specific keys are permanently unresponsive due to membrane wear, the keypad membrane assembly will need to be replaced as part of a panel repair.

Project fails to download from WinCC flexible to the panel

Check the communication cable between the PC and the panel (MPI adapter or PC/PPI cable). Verify the correct COM port and transfer settings are selected in WinCC flexible. Confirm the panel is in transfer mode.

Place the panel in transfer mode via the panel's start-up menu. Ensure the correct communication adapter and port settings are configured in WinCC flexible. Replace the communication cable if it is found to be faulty.

Panel displays incorrect or garbled characters on screen

This may indicate corrupted project data on the panel or a firmware incompatibility. Check the WinCC flexible project for correct font and character set settings.

Re-download the project to the panel from WinCC flexible. If the issue persists, perform a firmware update to ensure the panel firmware is compatible with the project version.

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