Siemens 6AV6344-2AC24-0CG7 OP 177B

SKU: 6AV6344-2AC24-0CG7 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6344-2AC24-0CG7 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 STN display and is part of the 170 series of compact operator panels, offering reliable process visualization and control in industrial environments. It is configured for operation with 24 V DC supply and communicates with SIMATIC PLCs and third-party controllers.

The OP 177B features a 5.7-inch STN display with a resolution of 320 x 240 pixels and supports both touch and key-based operation through its integrated membrane keypad. It includes MPI/PROFIBUS DP and RS-422/RS-485 interfaces for PLC connectivity, along with a USB port for project transfer and data backup. The panel is configured using WinCC flexible engineering software and supports recipe management, alarm logging, and trend display functions. Onboard flash memory enables local storage of project data and historical logs.

The OP 177B is widely deployed in manufacturing, packaging, and process automation applications where a compact, robust operator interface is required at the machine level. Its compatibility with the full range of SIMATIC S7 PLCs, as well as Allen-Bradley, Mitsubishi, and other third-party controllers via serial protocols, makes it suitable for diverse automation environments. The panel's fanless design and wide operating temperature range make it appropriate for installation in control cabinets in demanding industrial settings.

Technical Specifications

Display Size	5.7 inch
Display Type	STN monochrome
Display Resolution	320 x 240 pixels (QVGA)
Touch Technology	Resistive touch screen with membrane keypad
Input/Operating Voltage	24 V DC
Power Consumption	Max. 9 W
Communication Interface	MPI/PROFIBUS DP, RS-422/RS-485, USB
Engineering 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
IP Rating (Rear)	IP20
Mounting	Panel mounting
Certifications	CE, UL, cULus
Series/Product Family	SIMATIC HMI OP 177B

Common Error Codes & System Events

Event ID: 10000: Configuration error: The project loaded on the panel is incompatible or corrupt.
Reload the project using WinCC flexible. Verify the project was compiled without errors before transfer.
Event ID: 20000: Communication error: Connection to the PLC has been lost or cannot be established.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify PLC address settings match the project configuration.
Event ID: 40000: Tag read/write error: A configured tag cannot be read from or written to the controller.
Verify the tag address in WinCC flexible matches the actual PLC memory address. Check PLC program for address conflicts.
Event ID: 50000: Alarm buffer overflow: The alarm log has exceeded its storage capacity.
Archive or clear the alarm buffer. Increase the alarm buffer size in the WinCC flexible project settings if required.
Event ID: 60000: Recipe data error: A recipe record could not be read or written correctly.
Check recipe configuration in WinCC flexible. Verify that the associated PLC data block exists and has the correct structure.
Event ID: 70000: System memory low: Available panel memory is insufficient for current operations.
Delete unused project data, archived logs, or recipe records from the panel. Consider optimizing the project size.
Event ID: 80000: Operating system error: An internal system fault has been detected.
Perform a panel restart. If the fault persists, perform a factory reset and reload the project firmware and application.

Frequently Asked Questions

What PLC systems are compatible with the OP 177B?

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

What software is required to program and configure the OP 177B?

The OP 177B is configured using Siemens WinCC flexible 2005 or a later version. Projects are transferred to the panel via USB or MPI/PROFIBUS DP connection.

What is the supply voltage for the 6AV6344-2AC24-0CG7?

The panel operates on a 24 V DC supply voltage, which is the standard supply for SIMATIC HMI operator panels.

Does the OP 177B support touch input?

Yes, the OP 177B features a resistive touch screen in addition to a membrane keypad with function keys, allowing both touch-based and key-based operator interaction.

What is the IP protection rating of the OP 177B?

The front face of the OP 177B is rated IP65, providing protection against dust and water jets. The rear of the unit is rated IP20.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the power connector. Verify polarity is correct and the supply is within tolerance. Inspect internal fuse if accessible.

Ensure the 24 V DC supply is stable and correctly connected. Replace the power supply if voltage is absent or out of range. If the supply is correct and the display remains blank, the backlight or internal power board may require replacement.

Panel cannot establish communication with the PLC

Verify the MPI or PROFIBUS DP cable is correctly wired and terminated. Check that the bus address configured on the panel matches the project settings and that the PLC is in RUN mode.

Correct any wiring or termination issues on the MPI/PROFIBUS network. Ensure the panel node address does not conflict with other devices on the bus. Reload the project if communication parameters were recently changed.

Touchscreen does not respond or responds inaccurately

Check for physical damage or contamination on the touch surface. Attempt a touchscreen recalibration from the panel's system settings menu.

Clean the touch surface with a soft, dry cloth. Perform a touchscreen calibration via the Control Panel in the panel's Start Center. If calibration fails repeatedly, the touch foil may need replacement.

Project transfer via USB fails

Verify the USB cable is functional and the correct transfer mode is selected on the panel. Check that the WinCC flexible version used to compile the project is compatible with the panel firmware version.

Use a known-good USB cable and ensure the panel is in Transfer mode before initiating the download. Update the panel firmware if there is a version mismatch between the engineering software and the panel OS.

Panel repeatedly reboots or freezes during operation

Check the 24 V DC supply for voltage dips or instability under load. Inspect the project for memory overload or excessively large alarm/recipe configurations.

Stabilize the power supply and ensure it is adequately rated for the panel's power consumption. Optimize the WinCC flexible project by reducing unnecessary data logs or recipe entries, and reload the project after optimization.

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