Siemens 6AV6355-1CA31-8DL6 OP 77B

€ 3.495,00

SKU: 6AV6355-1CA31-8DL6 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA31-8DL6 is an operator panel belonging to the OP 77B series within the Siemens SIMATIC HMI product family. It is a compact, key-operated panel designed for machine-level operator control and monitoring tasks. This unit provides a text-based display interface and is intended for integration into industrial control systems as a cost-effective human-machine interface solution.

The OP 77B features a multi-line text display capable of showing process values, alarms, and status messages. It communicates via MPI and PROFIBUS DP interfaces, enabling direct connection to SIMATIC S7 PLCs without the need for additional gateways. The panel supports configuration via Siemens WinCC flexible software and includes function keys for operator input, with LED indicators for status feedback. It operates on a 24 V DC supply and is built to withstand typical industrial environments.

The OP 77B is widely used in manufacturing, machine building, and process automation applications where a simple, reliable operator interface is required. It is particularly suited for controlling conveyor systems, packaging machinery, and general-purpose machine tools where text-based status display and direct PLC communication are sufficient. Its compact form factor and panel-mount design make it suitable for integration into control cabinets and machine front panels.

Technical Specifications

Series	SIMATIC HMI OP 77B
Display Type	STN LCD, text-based
Display Lines	4 lines
Characters per Line	20 characters
Input/Operating Voltage	24 V DC
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
Mounting	Panel mounting
Supply Voltage	24 V DC (20.4 V to 28.8 V)
Certifications	CE, UL

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 panel configuration. Ensure the PLC is in RUN mode.
Event ID: 10001: Connection to the configured PLC has been lost during operation.
Inspect physical cabling for damage or loose connectors. Verify bus termination and cable shielding. Restart the panel and PLC if the connection is not re-established automatically.
Event ID: 20000: Configuration or project download error. The project loaded on the panel is incompatible or corrupt.
Re-download the project from WinCC flexible to the panel. Ensure the WinCC flexible version matches the panel firmware version. Perform a memory reset if the error persists.
Event ID: 40000: System memory error or internal fault detected on the panel.
Perform a factory reset of the panel. If the error recurs after reset and re-download, the panel may require hardware repair or replacement.
Event ID: 50000: Firmware version mismatch between the panel and the loaded project.
Update the panel firmware to the version required by the WinCC flexible project, or recompile the project using the firmware version installed on the panel.
Event ID: 70000: Tag or variable update error. One or more configured tags cannot be read from or written to the PLC.
Verify that the tag addresses in the WinCC flexible project match the actual PLC data block or memory addresses. Check PLC program for address changes.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B panel?

The OP 77B communicates via MPI and PROFIBUS DP, making it directly compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs. No additional communication modules or gateways are required for these connections.

What software is used to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible 2005 or a later compatible version. Projects are downloaded to the panel via a PC adapter connected to the MPI interface.

What is the supply voltage for the 6AV6355-1CA31-8DL6?

The panel operates on a 24 V DC supply with an acceptable input range of 20.4 V to 28.8 V. An external 24 V DC power supply must be provided.

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 when correctly installed in a panel cutout.

Can the OP 77B display graphical content or images?

No, the OP 77B is a text-based operator panel and does not support graphical or bitmap image display. It is limited to alphanumeric text, status messages, and alarm displays across its 4-line LCD.

Troubleshooting

Display remains blank after power on

Check that 24 V DC is present at the power supply connector. Measure voltage at the panel terminals to confirm supply is within the 20.4 V to 28.8 V range. Inspect the supply cable and connector for damage.

Restore correct supply voltage if out of range. Replace the power supply cable or connector if damaged. If voltage is correct and display remains blank, the internal power supply or display unit may require repair or replacement.

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

Verify MPI or PROFIBUS DP cable is correctly connected and terminated at both ends. Check that the PLC station address configured in WinCC flexible matches the actual PLC address. Confirm the PLC is powered and in RUN mode.

Correct any address mismatches in the WinCC flexible project and re-download. Replace or re-terminate the communication cable if found to be faulty. Ensure bus termination resistors are active only at the two physical ends of the bus.

Project download fails or panel does not accept new configuration

Confirm the WinCC flexible version used to create the project is compatible with the panel firmware. Check the PC adapter connection to the MPI port. Verify the panel is not in protected or locked mode.

Update the panel firmware or recompile the project with a compatible WinCC flexible version. Perform a memory reset on the panel before re-attempting the download. Replace the PC adapter cable if communication cannot be established.

Function keys do not respond or produce incorrect actions

Check the project configuration in WinCC flexible to confirm the correct functions are assigned to each key. Inspect the keypad membrane for physical damage or contamination beneath the keys.

Correct key assignments in the WinCC flexible project and re-download. If the keypad membrane is physically damaged, the front panel assembly will require replacement.

Alarm messages are not displayed or are missing

Verify that alarm tags in the WinCC flexible project are correctly mapped to the corresponding PLC bit addresses. Confirm the PLC program is setting the alarm bits as expected during fault conditions.

Correct tag address mapping in the project and re-download. Test alarm triggering by manually setting the relevant PLC bits during commissioning to confirm correct display behavior.

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