Siemens 6AV6355-1CA47-7DK2 OP 77B

€ 419,36

SKU: 6AV6355-1CA47-7DK2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7DK2 is an operator panel (OP 77B) 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 numeric/function keypad interface, making it suitable for applications where a full touchscreen is not required.

The OP 77B features a built-in MPI/PROFIBUS DP interface for direct integration with Siemens SIMATIC S7 PLCs, as well as support for the PROFIBUS DP protocol. It is configured using Siemens WinCC flexible software, enabling structured project engineering. The panel offers internal flash memory for project and recipe storage, and supports alarm logging, recipe management, and simple trend displays within its operational scope.

The OP 77B is widely deployed in manufacturing, packaging, and process automation environments where operators require a reliable, cost-effective interface for machine monitoring and parameter adjustment. Its compact form factor and robust keypad design make it particularly suitable for control cabinet door mounting in industrial settings where space is limited and durability is a priority.

Technical Specifications

Display Type	Monochrome LCD (STN)
Display Size	4 inches
Display Resolution	320 x 240 pixels
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.5 W
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 Protection Rating	IP65 (front), IP20 (rear)
Mounting	Panel mounting
Series/Product Family	SIMATIC HMI OP 77B
Configuration Software	WinCC flexible 2008 or later
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 1003: Connection to PLC interrupted or communication timeout detected on MPI/PROFIBUS DP interface.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify PLC is powered and the configured station address matches the PLC settings.
Event ID: 1004: Project download failed or project data on the panel is corrupted.
Re-download the project from WinCC flexible to the panel. Ensure the correct panel type is selected in the project settings.
Event ID: 10000: System startup error — internal flash memory could not be read correctly.
Perform a factory reset via the panel's loader menu. If the error persists, the internal flash memory may need replacement or the unit requires service.
Event ID: 1740: Recipe data error — recipe record could not be read or written.
Check recipe configuration in WinCC flexible. Verify that the recipe data area in the PLC matches the panel configuration and that memory is not full.
Event ID: 2521: Illegal tag value — a tag value received from the PLC is outside the configured limit range.
Check the PLC data block for the affected tag. Verify the configured limit values in WinCC flexible match the expected PLC data range.
Event ID: 1460: No project loaded on the panel — panel starts in loader/transfer mode without a valid project.
Download a valid WinCC flexible project to the panel using a PC connection via MPI or USB/serial adapter.
Event ID: 1702: Alarm buffer overflow — the number of pending alarms exceeds the panel's alarm buffer capacity.
Acknowledge and clear existing alarms. Review the alarm configuration in WinCC flexible to reduce the number of simultaneous active alarms.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B (6AV6355-1CA47-7DK2)?

The OP 77B is primarily designed for use with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It can also communicate with S7-1200 PLCs in certain configurations using PROFIBUS DP.

What software is required to configure and program this panel?

The OP 77B is configured using Siemens WinCC flexible 2008 or a compatible version. The correct panel type must be selected during project creation to ensure compatibility.

What is the supply voltage for the 6AV6355-1CA47-7DK2?

The panel operates on 24 V DC. Ensure the power supply is within the specified tolerance range and is adequately rated for the panel's power consumption.

Can the OP 77B be used with a PROFIBUS DP network?

Yes, the OP 77B supports PROFIBUS DP communication, allowing it to be integrated into existing PROFIBUS networks alongside other Siemens automation components.

What is the front panel protection rating of this unit?

The front panel of the OP 77B carries an IP65 protection rating, making it resistant to dust ingress and low-pressure water jets, suitable for industrial cabinet door mounting.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel's power connector. Check for blown fuses in the supply circuit and verify polarity is correct.

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

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

Check the MPI/PROFIBUS DP cable for physical damage and verify that bus termination resistors are correctly installed at both ends of the network. Confirm the station address configured on the panel matches the PLC address.

Replace damaged cables, correct termination, and ensure address settings match in both the WinCC flexible project and the PLC hardware configuration. Restart both the panel and PLC after corrections.

Panel starts in transfer/loader mode and does not load the project

This typically indicates that no valid project is stored on the panel, or the existing project has become corrupted due to a failed download or power interruption during transfer.

Reconnect the programming PC and re-download the WinCC flexible project to the panel. Ensure power is stable during the transfer process to prevent further corruption.

Keypad buttons are unresponsive or intermittently fail to register input

Inspect the keypad membrane for physical damage, contamination, or wear. Check that the panel is not in a locked or password-protected state that restricts operator input.

Clean the keypad surface with a dry cloth. If individual keys are mechanically damaged, the keypad membrane assembly may need replacement. Verify operator authorization levels in the project configuration.

Alarm messages are displayed in incorrect language or with garbled text

Check the language settings within the WinCC flexible project. Verify that the correct language pack has been downloaded to the panel and that the active language index is set correctly.

Re-download the project with the correct language configuration. Ensure that the font used supports the required character set and that the language switching tag in the PLC is set to the correct value.

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