Siemens 6AV6355-1CA47-7EE0 OP 77B

€ 764,03

SKU: 6AV6355-1CA47-7EE0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7EE0 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 visualization and control tasks. This unit provides a monochrome display with a membrane keypad interface, making it suitable for applications where a robust, cost-effective HMI solution is required.

The OP 77B features a 4-line STN monochrome LCD display capable of showing text and simple graphics. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration with Siemens S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and supports alarm management, recipe handling, and trend display functions within its onboard memory capacity.

The OP 77B is widely deployed in manufacturing, packaging, and process automation environments where a dedicated operator station is needed at the machine level. Its compact form factor and panel-mount design make it suitable for integration into control cabinet doors and operator consoles. The unit is particularly common in applications requiring reliable text-based status display and operator input without the complexity of a full graphical HMI.

Technical Specifications

Display Type	STN monochrome LCD
Display Lines	4 lines of text
Keypad Type	Membrane keypad
Input Voltage	24 V DC
Power Consumption	4.5 W (typical)
Communication Interface	MPI / PROFIBUS DP
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 mount
Configuration Software	WinCC flexible 2008
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 1000: System startup completed successfully. The HMI panel has booted and initialized without errors.
No action required. This is an informational event confirming normal startup.
Event ID: 10000: Connection to the PLC has been lost or could not be established.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify PLC address settings match the HMI configuration in WinCC flexible.
Event ID: 10001: Communication timeout with the configured PLC controller.
Verify the baud rate and station address settings on both the HMI and PLC. Check cable integrity and network termination.
Event ID: 20000: Tag read error. The HMI is unable to read a configured data tag from the PLC.
Confirm the tag address exists in the PLC program and that the data type matches the WinCC flexible configuration.
Event ID: 20001: Tag write error. A write operation to a PLC tag has failed.
Check PLC write protection settings and confirm the tag address and data type are correctly configured in WinCC flexible.
Event ID: 40000: Recipe data error. A recipe transfer operation has failed or data is inconsistent.
Verify recipe configuration in WinCC flexible. Check available memory and ensure tag addresses referenced in the recipe are valid.
Event ID: 50000: Alarm buffer overflow. The number of pending alarms has exceeded the buffer capacity.
Acknowledge and clear existing alarms. Review alarm configuration to reduce the number of simultaneously active alarms.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B (6AV6355-1CA47-7EE0)?

The OP 77B is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP communication interfaces.

What software is used to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible 2008 software. Projects are transferred to the panel via the MPI interface or a PC adapter cable.

What is the supply voltage for the 6AV6355-1CA47-7EE0?

The panel requires a 24 V DC power supply. Ensure the supply is within the specified tolerance range to avoid damage or malfunction.

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 is primarily a text-based operator panel with a monochrome LCD. It can display simple graphics and symbols in addition to alphanumeric text, but it is not a full graphical HMI.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the power connector on the rear of the panel. Check for correct polarity. Inspect the internal fuse if accessible.

Correct any wiring errors or supply voltage issues. If the supply is confirmed good and the display remains blank, the internal power supply or display backlight may have failed and the unit should be sent for repair or replacement.

HMI shows 'No connection to PLC' or communication error on screen

Check the MPI or PROFIBUS DP cable between the OP 77B and the PLC. Verify bus termination is correctly applied at both ends of the network. Confirm the station addresses and baud rate settings match on both devices.

Replace or reseat the communication cable. Correct station address and baud rate settings in WinCC flexible and re-download the project. Ensure only the two physical ends of the bus have termination resistors enabled.

Keypad buttons are unresponsive or intermittently responsive

Inspect the membrane keypad surface for physical damage, contamination, or wear. Check that the panel is not in a locked or protected operating mode that disables input.

Clean the keypad surface with a dry cloth. If keys are physically damaged or the membrane has failed, the keypad assembly requires replacement. Verify no software-level input protection is active in the WinCC flexible project.

Project download from PC to OP 77B fails

Verify the PC adapter cable is correctly connected to the MPI port and that the correct COM port and transfer speed are selected in WinCC flexible. Check that the panel is in transfer mode.

Set the OP 77B to transfer mode via the Start Center menu. Ensure the PC adapter driver is correctly installed and the baud rate matches between WinCC flexible and the adapter settings. Retry the download.

Alarms are not displayed on the panel despite fault conditions in the PLC

Check the alarm configuration in the WinCC flexible project to confirm the correct PLC bit addresses are mapped to alarm events. Verify the PLC program is setting the expected alarm bits.

Correct any mismatched tag addresses in the alarm configuration and re-download the project. Confirm the PLC logic is functioning correctly and setting the alarm trigger bits as expected.

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