Siemens 6AV6344-2AC14-0MG7 OP 177B

€ 1.995,00

SKU: 6AV6344-2AC14-0MG7 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6344-2AC14-0MG7 is an OP 177B operator panel belonging to the SIMATIC HMI family of human-machine interface devices. This unit provides a compact, panel-mounted interface for machine-level visualization and control, featuring a monochrome STN display with touch and key-based operation. As part of the SIMATIC HMI Comfort and Basic panel lineage, it is designed for use with Siemens SIMATIC S7 and other compatible PLC systems.

The OP 177B features a 5.7-inch STN monochrome display with a resolution of 320 x 240 pixels (QVGA) and supports up to 256 grayscale levels. It is equipped with MPI/PROFIBUS DP and RS-422/RS-485 interfaces for PLC communication, as well as a USB port for project download and data transfer. The panel runs on WinCC flexible runtime software and provides 512 kB user memory for project data. It operates on a 24 V DC supply and is rated IP65 at the front panel, making it suitable for installation in control cabinet doors.

The OP 177B is widely used in manufacturing, machine building, and process automation environments where a reliable, mid-range HMI solution is required. It is commonly found on packaging machinery, conveyor systems, injection molding machines, and general-purpose industrial equipment. Its compatibility with SIMATIC S7-200, S7-300, and S7-400 PLCs makes it a versatile choice for a broad range of automation architectures.

Technical Specifications

Display Size	5.7 inch
Display Resolution	320 x 240 pixels (QVGA)
Display Type	STN monochrome
Display Colors	256 grayscale levels
Input Voltage	24 V DC
Power Consumption	Max. 9 W
Communication Interface	MPI/PROFIBUS DP, RS-422/RS-485, USB
User Memory	512 kB
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: Communication error between the HMI panel and the connected PLC. The configured connection cannot be established or has been lost.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the HMI project configuration. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Communication timeout. The HMI panel did not receive a response from the PLC within the configured timeout period.
Check physical wiring and connector integrity. Verify network address settings and reduce network load if multiple devices share the bus. Increase the timeout value in the HMI project if necessary.
Event ID: 20000: Project download error. A fault occurred during transfer of the project file to the HMI panel.
Verify the USB connection or communication cable is secure. Ensure the correct COM port and transfer settings are selected in WinCC flexible. Restart the panel in transfer mode and retry the download.
Event ID: 40000: System memory low. Available runtime memory is insufficient to execute the current project.
Reduce the project size by optimizing screens, removing unused tags, or reducing image file sizes. Ensure the project does not exceed the 512 kB user memory limit.
Event ID: 50000: Internal device error. A hardware or firmware fault has been detected within the HMI panel.
Perform a power cycle of the panel. If the error persists, perform a factory reset via the Control Panel in the Start Center. Contact Siemens technical support or arrange for unit repair if the fault recurs.
Event ID: 60000: Configuration error. The loaded project contains settings or objects incompatible with the current firmware version of the panel.
Check the WinCC flexible project version against the panel firmware version. Update the panel firmware to the required version or recompile the project targeting the correct panel firmware version.
Event ID: 70000: Tag read/write error. A configured tag could not be read from or written to the connected controller.
Verify the tag address is correctly configured in the HMI project and matches the PLC data structure. Check that the PLC memory area referenced by the tag is accessible and not write-protected.

Frequently Asked Questions

Which PLCs are compatible with the OP 177B (6AV6344-2AC14-0MG7)?

The OP 177B is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It also supports communication with third-party controllers via the RS-422/RS-485 serial interface using supported protocols.

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

The OP 177B is configured using Siemens WinCC flexible software. Projects are compiled in WinCC flexible and transferred to the panel via USB or the MPI/PROFIBUS interface.

What is the supply voltage for the 6AV6344-2AC14-0MG7?

The panel operates on a 24 V DC supply voltage. The power consumption is a maximum of 9 W under normal operating conditions.

What is the front panel protection rating of the OP 177B?

The front panel of the OP 177B is rated IP65, making it resistant to dust ingress and low-pressure water jets. The rear of the unit is rated IP20.

Can the OP 177B firmware be updated in the field?

Yes, the firmware can be updated via the USB interface or through the MPI/PROFIBUS DP connection using the ProSave tool or WinCC flexible. Always ensure the new firmware version is compatible with the existing project before updating.

Troubleshooting

Display remains blank after power is applied

Check that 24 V DC is present at the power supply terminals of the panel. Measure voltage at the connector to confirm supply integrity. Inspect the internal fuse if accessible.

Verify and restore the 24 V DC supply. If supply voltage is correct and the display remains blank, the internal power supply or backlight may have failed. The unit should be sent for repair or the backlight assembly replaced by a qualified technician.

HMI panel fails to communicate with the PLC

Check the MPI or PROFIBUS DP cable for continuity and correct termination at both ends of the bus. Verify that the PLC station address configured in the HMI project matches the actual PLC address. Confirm the baud rate settings are consistent across all devices on the bus.

Replace or reseat the communication cable. Correct any address or baud rate mismatches in the WinCC flexible project and re-download. Ensure bus termination resistors are enabled only at the physical ends of the network.

Touchscreen or function keys are unresponsive

Determine whether the issue affects the touchscreen, the membrane keys, or both. Check if the panel is in transfer mode, which disables normal operation. Inspect the screen surface for damage or contamination.

Exit transfer mode via the Start Center if applicable. Clean the screen surface with a soft, dry cloth. If keys remain unresponsive after a power cycle, the keypad membrane or touch controller may require replacement.

Project download fails or is interrupted

Check the USB cable connection between the engineering PC and the panel. Ensure the panel is set to transfer mode via the Start Center. Verify that the WinCC flexible project is compiled without errors and targets the correct panel type and firmware version.

Use a known-good USB cable and retry the transfer. If using MPI/PROFIBUS for download, verify cable integrity and PC adapter settings. Recompile the project after correcting any version mismatches and attempt the download again.

Panel displays 'No project' or starts into the Start Center unexpectedly

This typically indicates that the project stored in the panel memory has been lost or corrupted, often due to a failed download, power interruption during transfer, or a firmware update.

Re-download the project from WinCC flexible using a stable USB or MPI connection. Ensure the power supply to the panel is stable during the transfer process. If the issue persists, perform a factory reset via the Start Center and re-download the project and firmware.

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