Siemens 6AV6344-2AC34-0CF7 OP 177B

€ 1.995,00

SKU: 6AV6344-2AC34-0CF7 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6344-2AC34-0CF7 is an OP 177B operator panel belonging to the SIMATIC HMI family, designed for machine-level human-machine interface applications. This unit provides a monochrome or color graphical display with keypad-based operation, enabling operators to monitor and control industrial processes directly at the machine. It is part of Siemens' mid-range HMI portfolio, positioned between basic text panels and full-featured touch panels.

The OP 177B features a 5.7-inch STN display and supports both MPI and PROFIBUS DP communication interfaces, allowing direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. It includes onboard flash memory for project storage and is configured using WinCC flexible engineering software. The panel supports recipe management, alarm logging, trend displays, and multi-language operation, making it suitable for a wide range of automation tasks.

The OP 177B is commonly deployed in manufacturing, packaging, food and beverage, and process industries where robust panel-mount HMI solutions are required. Its keypad-based interface makes it well-suited for environments where touchscreen operation is impractical due to gloves, dust, or vibration. The unit's compact form factor and standard panel cutout dimensions simplify integration into existing control cabinet doors and machine enclosures.

Technical Specifications

Display Size	5.7 inch
Display Type	STN LCD
Display Colors	256 colors
Display Resolution	320 x 240 px (QVGA)
Input/Operating Voltage	24 V DC
Power Consumption	Max. 9 W
Communication Interface	MPI, PROFIBUS DP, RS-422/485
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 177B
Certifications	CE, UL, cULus
Engineering Software	WinCC flexible 2005 or higher

Common Error Codes & System Events

Event ID: 10000: Connection to PLC could not be established or was interrupted during operation.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify PLC address settings match the HMI project configuration.
Event ID: 10001: Communication timeout: no response received from the configured PLC within the expected time window.
Verify PLC is in RUN mode and the communication cable is intact. Check baud rate and station address settings on both the HMI and PLC.
Event ID: 20000: Project download failed or project data on the panel is corrupted.
Re-download the project from WinCC flexible. Ensure the correct panel type and firmware version are selected in the engineering software.
Event ID: 40000: Internal flash memory error detected during startup or operation.
Perform a factory reset and re-download the project. If the error persists, the internal flash memory may require service or panel replacement.
Event ID: 50000: Firmware version mismatch between the HMI panel and the downloaded project.
Update the panel firmware using ProSave or WinCC flexible to match the version required by the project.
Event ID: 60000: Recipe data error: recipe record could not be read or written correctly.
Check recipe configuration in the project. Verify available memory and that recipe data structures match between the project and the panel.
Event ID: 70000: Alarm buffer overflow: the number of pending alarms exceeds the buffer capacity.
Acknowledge and clear existing alarms. Review alarm configuration to reduce simultaneous alarm triggers or increase buffer size in the project settings.

Frequently Asked Questions

Which PLCs are compatible with the OP 177B (6AV6344-2AC34-0CF7)?

The OP 177B is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It also supports communication with S7-1200 and third-party controllers via RS-422/485 using appropriate drivers in WinCC flexible.

What engineering software is required to configure this panel?

The OP 177B is configured using Siemens WinCC flexible 2005 or a later version. ProSave can be used separately for firmware updates and backup/restore operations.

What is the supply voltage for the 6AV6344-2AC34-0CF7?

The panel operates on 24 V DC. Ensure the power supply is within the specified tolerance range to avoid operational issues.

Can the OP 177B be used in outdoor or harsh environments?

The front face of the panel carries an IP65 protection rating, making it resistant to dust and water jets. However, the rear of the unit is rated IP20, so it must be installed in an enclosure that provides adequate protection for the back of the panel.

Is the OP 177B still supported by Siemens?

The OP 177B is a legacy product and has been discontinued by Siemens. Spare units, repairs, and refurbished panels are available through specialist suppliers, and existing installations can continue to be maintained using WinCC flexible software.

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 of the DC connection.

Correct any wiring errors and ensure the supply voltage is stable within the 24 V DC tolerance. If the supply is confirmed good and the display remains blank, the internal power supply board or backlight may require replacement.

Panel displays 'No connection to PLC' message repeatedly

Check the MPI or PROFIBUS DP cable for physical damage and verify that termination resistors are correctly installed at both ends of the bus. Confirm the PLC station address and baud rate match the HMI project settings.

Replace or reseat the communication cable, correct address and baud rate settings in the project, and re-download the project to the panel. Ensure the PLC is powered and in RUN mode.

Touchscreen or keypad buttons are unresponsive

Verify that the panel is not in a locked or password-protected state. Check if the issue is limited to specific keys or all input methods, as this helps distinguish between a software lock and a hardware fault.

Perform a soft reset by cycling power. If specific keys are physically damaged, the keypad membrane may need replacement. If all input is unresponsive, perform a factory reset using ProSave and re-download the project.

Project download fails or times out during transfer

Check the USB or MPI/PROFIBUS connection between the engineering PC and the panel. Verify that the correct communication interface and transfer settings are selected in WinCC flexible.

Restart both the panel in transfer mode and the engineering PC, then retry the download. Ensure the WinCC flexible project is compiled without errors and that the firmware version on the panel matches the project requirements.

Panel restarts unexpectedly during operation

Monitor the 24 V DC supply voltage for voltage dips or instability, particularly under load. Check the operating environment temperature, as overheating can cause unexpected resets.

Stabilize the power supply and ensure adequate ventilation around the panel. If the issue persists, check for corrupted project data by re-downloading the project, and inspect the panel for internal hardware faults.

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