Siemens 6AV6355-1CA47-7EG0 OP 77B

€ 1.287,43

SKU: 6AV6355-1CA47-7EG0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7EG0 is an OP 77B operator panel belonging to the SIMATIC HMI Basic Panels product family. It is designed for straightforward machine-level operator control and monitoring tasks, providing a compact and cost-effective human-machine interface solution. This unit is part of Siemens' established line of key-operated panels intended for integration into industrial control cabinets and machinery.

The OP 77B features a monochrome STN LCD display with a resolution of 160 x 80 pixels and a membrane keypad for operator input, eliminating the need for a touchscreen. It supports MPI and PROFIBUS DP communication interfaces for direct connection to SIMATIC S7 PLCs, and includes a serial RS-422/RS-485 interface. The panel is configured using Siemens WinCC flexible software and offers onboard flash memory for project storage. It operates on a 24 V DC supply and is rated IP65 at the front panel for protection against dust and water ingress.

The OP 77B is typically deployed in discrete manufacturing, machine building, and process automation environments where a simple, robust operator interface is required. It is well suited for applications such as packaging machinery, conveyor systems, and general-purpose machine tools where operators need to monitor status values, enter setpoints, and acknowledge alarms without requiring a full graphical touchscreen interface.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Colors	Monochrome (blue/white)
Input Type	Membrane keypad
Input/Operating Voltage	24 V DC
Communication Interface	MPI, PROFIBUS DP, RS-422/RS-485
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% to 90% (non-condensing)
Configuration Software	WinCC flexible 2008 or higher
Mounting	Panel mounting
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 10000: No project loaded on the device. The panel has started but no valid configuration project is present in memory.
Download a valid WinCC flexible project to the panel using the configuration PC and appropriate transfer cable or network connection.
Event ID: 10001: Transfer mode active. The panel is waiting for a project download from the configuration software.
Initiate project transfer from WinCC flexible on the engineering PC, or restart the panel to exit transfer mode if transfer is not intended.
Event ID: 20000: Connection to PLC lost. The communication link between the OP 77B and the configured SIMATIC S7 PLC has been interrupted.
Check MPI or PROFIBUS DP cabling and connectors, verify PLC is powered and running, and confirm correct station address settings on both devices.
Event ID: 20001: PLC communication timeout. The panel did not receive a response from the PLC within the expected time frame.
Verify network cable integrity, check bus termination resistors on PROFIBUS DP segment, and confirm PLC program is executing without faults.
Event ID: 40000: System memory low. Available memory for runtime operation is insufficient, which may affect panel performance.
Reduce the size of the loaded project, decrease the number of active alarms or data records, and consider optimizing the WinCC flexible project configuration.
Event ID: 50000: Internal device error. A hardware or firmware fault has been detected within the panel.
Perform a panel restart. If the error persists, perform a factory reset via the panel's Start Center and reload the project. Contact Siemens support if the fault remains.
Event ID: 60000: Illegal system activity detected. An operation was attempted that is not permitted in the current operating state.
Review the project configuration for conflicting scripts or events, ensure firmware version is compatible with the WinCC flexible project version, and update firmware if necessary.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B?

The OP 77B is primarily designed for use 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 the RS-422/RS-485 serial interface using the PPI protocol.

What software is required to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are transferred to the panel via a serial PC/PPI cable or through the MPI/PROFIBUS network.

What is the supply voltage for the 6AV6355-1CA47-7EG0?

The panel requires a 24 V DC supply voltage. Ensure the power supply can deliver sufficient current as specified in the device documentation.

Can the OP 77B be used outdoors?

The OP 77B carries an IP65 rating on its front face, providing protection against dust and water jets, but it is not rated for direct outdoor exposure to sunlight or extreme weather without additional enclosure protection.

How is the OP 77B mounted?

The OP 77B is designed for panel mounting, installed into a cutout in a control cabinet door or enclosure panel and secured with mounting clamps from the rear.

Troubleshooting

Display remains blank after power is applied

Check that 24 V DC is present at the power supply terminals of the panel. Verify polarity is correct. Inspect the supply cable for damage or loose connections.

Correct any wiring faults and ensure the power supply output is within the 24 V DC tolerance range. If voltage is confirmed correct and display remains blank, the internal power supply or display backlight may have failed and the unit should be sent for repair.

Panel stuck in transfer mode and will not load the project

The panel enters transfer mode automatically if no project is present or if the transfer mode was manually activated. Check the Start Center settings on the panel.

If a project has already been loaded, restart the panel and ensure 'Transfer' is not set as the startup mode in the Start Center. Download the project again from WinCC flexible if the project memory has been erased.

Communication fault alarm displayed, PLC data not updating

Verify the MPI or PROFIBUS DP cable connections at both the panel and PLC. Check that bus termination is correctly applied at both ends of the PROFIBUS segment. Confirm the station addresses configured in WinCC flexible match the actual PLC address.

Replace or reseat communication cables, correct bus termination, and verify address settings. If using PROFIBUS DP, ensure the baud rate configured in the project matches the network baud rate.

Keypad buttons not responding or responding incorrectly

Inspect the membrane keypad surface for physical damage, contamination, or deformation. Test each key systematically in the panel's diagnostic mode if available.

Clean the keypad surface with a dry cloth. If keys are physically damaged or the membrane is torn, the keypad membrane assembly requires replacement. This is typically a workshop-level repair.

Panel displays incorrect or garbled characters on screen

This may indicate a corrupted project file, a firmware mismatch between the project and the panel, or a failing display.

Re-download the WinCC flexible project to the panel. Ensure the firmware version on the panel is compatible with the project version. If the issue persists after a fresh project download, the display hardware may be faulty and the unit should be inspected for repair.

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