Siemens 6AV6355-1CA47-7EQ4 OP 77B

€ 497,02

SKU: 6AV6355-1CA47-7EQ4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7EQ4 is an operator panel belonging to the SIMATIC HMI OP 77B series, manufactured by Siemens. It is a compact, key-operated panel designed for machine-level human-machine interface applications, providing operators with a straightforward means of monitoring and controlling industrial processes. This unit is part of the SIMATIC HMI Basic Panels generation, offering reliable operator interaction without a touchscreen interface.

The OP 77B features a monochrome STN LCD display and a membrane keypad with function keys, system keys, and alphanumeric input capability. It supports communication via PROFIBUS DP and MPI interfaces, enabling direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. Configuration is performed using WinCC flexible software, and the panel includes an integrated 24 V DC power supply input. The unit is rated to IP65 on the front face, providing protection against dust and water jets in industrial environments.

The OP 77B is widely deployed in manufacturing, packaging, and process automation applications where a cost-effective, robust operator interface is required at the machine level. Its compact form factor and keypad-based operation make it suitable for environments where touchscreen panels are impractical, such as areas with heavy glove use or high contamination. Industries including food and beverage, automotive assembly, and general machine building commonly use this panel for local operator control stations.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
Power Consumption	Max. 6 W
Communication Interface	PROFIBUS DP, MPI
IP Rating (Front)	IP65
IP Rating (Rear)	IP20
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
Mounting	Panel mounting
Configuration Software	WinCC flexible 2005 or higher
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Certifications	CE, UL, cULus

Common Error Codes and System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC. The connection to the controller has been interrupted or cannot be established.
Check PROFIBUS/MPI cable connections and termination resistors. Verify the PLC address settings match the HMI project configuration. Restart both the panel and the PLC.
Event ID: 10001: Connection to the PLC was established but subsequently lost during operation.
Inspect cabling for damage or loose connectors. Check for electromagnetic interference sources near the communication cable. Verify PLC is in RUN mode.
Event ID: 20000: Tag read error. The HMI panel cannot read a configured tag from the PLC.
Verify the tag address in the WinCC flexible project matches the actual PLC data block or memory address. Check PLC program for address conflicts.
Event ID: 20001: Tag write error. The HMI panel cannot write a value to the configured PLC tag.
Confirm the PLC memory area is not write-protected. Check that the data type in the HMI project matches the PLC variable type. Verify communication is active.
Event ID: 40000: Project download error. A project transfer to the panel failed or was interrupted.
Check the transfer cable connection. Ensure WinCC flexible version is compatible with the panel firmware. Retry the transfer after restarting the panel in transfer mode.
Event ID: 50000: System memory low. The panel is running low on available runtime memory.
Reduce the number of active alarms or logged values. Simplify the project if possible. Consider clearing the alarm buffer and restarting the panel.
Event ID: 60000: Panel firmware version mismatch. The loaded project was created for a different firmware version than currently installed on the panel.
Update the panel firmware to the version required by the project, or recompile the project using the WinCC flexible version matching the installed firmware.
Event ID: 70000: Internal device error. A hardware fault has been detected within the panel.
Perform a factory reset of the panel. If the error persists after reset, the panel hardware may require repair or replacement.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B (6AV6355-1CA47-7EQ4)?

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

What software is used to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible 2005 or a later version. Projects are transferred to the panel via a PC/PPI or MPI cable connection.

What is the supply voltage for the 6AV6355-1CA47-7EQ4?

The panel requires a 24 V DC power supply. Ensure the supply is within the permissible tolerance range as specified in the device manual.

What is the front panel protection rating of the OP 77B?

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

Can the OP 77B be used without a PLC connection for standalone display purposes?

No, the OP 77B requires an active connection to a compatible PLC to display and interact with process data. It does not support standalone operation without a controller.

Troubleshooting

Display remains blank after power is applied

Check that 24 V DC is present at the power supply terminals of the panel using a multimeter. Inspect the connector for secure seating and check for any blown internal fuse.

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

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

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 the PLC address configured in the HMI project matches the physical PLC setting.

Replace or reseat the communication cable. Correct any address mismatches in the WinCC flexible project and re-download the project to the panel. Ensure the PLC is powered and in RUN mode.

Keypad buttons are unresponsive or intermittently responsive

Inspect the membrane keypad for physical damage, contamination, or deformation. Check whether the issue is limited to specific keys or affects all keys.

Clean the keypad surface with a dry cloth. If individual keys are permanently unresponsive, the membrane keypad assembly may need replacement. Contact a qualified repair technician for keypad replacement.

Project transfer from PC to panel fails repeatedly

Confirm the panel is set to transfer mode. Check the transfer cable type and connection. Verify that the WinCC flexible version used to create the project is compatible with the panel firmware version.

Restart the panel and re-enter transfer mode. Use a known-good transfer cable. If firmware mismatch is suspected, update the panel firmware via the Siemens ProSave tool before retrying the project transfer.

Alarm messages are displayed in incorrect language or with garbled text

Check the language settings within the WinCC flexible project and confirm the correct language has been compiled and downloaded to the panel.

Open the project in WinCC flexible, verify the language configuration, recompile the project, and perform a full download to the panel. Ensure the character set used is supported by the OP 77B firmware.

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