Siemens 6AV6344-2AC34-0MF7 OP177B

SKU: 6AV6344-2AC34-0MF7 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6344-2AC34-0MF7 is an OP177B operator panel belonging to the SIMATIC HMI family, designed for machine-level human-machine interface applications. This unit provides a monochrome graphical display with keypad-based operation, enabling operators to monitor and control industrial processes without a touchscreen. As part of the SIMATIC HMI Basic Panels generation, it is engineered for reliable integration into Siemens automation environments.

The OP177B features a 5.7-inch STN monochrome display with a resolution of 320 x 240 pixels and supports up to 4 grey scales. It is equipped with MPI/PROFIBUS DP and RS-422/RS-485 interfaces for communication with SIMATIC S7 PLCs, as well as an Ethernet interface for network connectivity. The panel includes 14 function keys with LEDs, a numeric keypad, and system keys for navigation. It operates on 24 V DC supply voltage and supports configuration via Siemens WinCC flexible software.

The OP177B is widely deployed in manufacturing, packaging, and process automation applications where robust keypad-based operation is preferred over touchscreen interaction. Its compatibility with SIMATIC S7-200, S7-300, and S7-400 PLCs makes it a versatile choice for both new installations and retrofitting existing Siemens-based control systems. The panel is suited for environments requiring a compact, panel-mount HMI with reliable communication over PROFIBUS DP networks.

Technical Specifications

Display Size	5.7 inch
Display Type	STN monochrome
Display Resolution	320 x 240 pixels
Display Colors	4 grey scales
Input/Operating Voltage	24 V DC
Power Consumption	Max. 10 W
Communication Interface	MPI/PROFIBUS DP, RS-422/RS-485, Ethernet (RJ45)
Memory	512 KB user memory
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 panel)
Mounting	Panel mounting
Certifications	CE, UL, cULus
Configuration Software	WinCC flexible 2005 or higher
Function Keys	14 function keys with LEDs

Common Error Codes & System Events

Event ID: 010000: Configuration error: No project loaded or project data is corrupted on the panel.
Reload the project using WinCC flexible. Ensure the correct project file is transferred to the panel.
Event ID: 040000: Communication error: Connection to the PLC cannot be established or has been lost.
Check MPI/PROFIBUS DP or Ethernet cable connections. Verify PLC address settings and communication parameters in the project configuration.
Event ID: 060000: Tag read error: The panel cannot read a configured tag from the PLC.
Verify the tag address in WinCC flexible matches the actual PLC data block or memory address. Check PLC program for correct data availability.
Event ID: 070000: Tag write error: The panel cannot write a value to a configured PLC tag.
Check write permissions for the tag in the PLC program. Verify the tag address and data type configuration in WinCC flexible.
Event ID: 020000: System memory low: Available panel memory is insufficient for the current project or runtime operation.
Reduce project size by optimizing graphics and scripts. Delete unused objects and transfer the optimized project to the panel.
Event ID: 080000: Recipe data error: Recipe records cannot be read from or written to the panel memory.
Check recipe configuration in WinCC flexible. Verify available memory and re-transfer the project if recipe data is corrupted.
Event ID: 110000: Printer error: A configured print job could not be completed.
Check printer connection and configuration settings. Verify the correct printer driver is configured in the project.

Frequently Asked Questions

Which PLCs are compatible with the OP177B (6AV6344-2AC34-0MF7)?

The OP177B is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP. It also supports communication with S7 PLCs over Ethernet using the integrated RJ45 interface.

What software is required to configure the OP177B?

The OP177B is configured using Siemens WinCC flexible 2005 or a later version. Projects are transferred to the panel via Ethernet, MPI, or a USB/serial connection.

What is the display type and resolution of the 6AV6344-2AC34-0MF7?

The panel features a 5.7-inch STN monochrome display with a resolution of 320 x 240 pixels, supporting 4 grey scales.

What is the supply voltage for the OP177B?

The OP177B operates on a 24 V DC supply voltage with a maximum power consumption of approximately 10 W.

What is the front panel protection rating of the OP177B?

The front panel of the OP177B carries an IP65 protection rating, making it suitable for use in environments where dust and water jets may be present.

Troubleshooting

Display remains blank after power on

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

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

Panel shows 'No project' or fails to load the project at startup

The panel memory may be empty, or the project file may be corrupted. Connect to the panel via WinCC flexible and check the transfer status.

Re-transfer the correct project file from WinCC flexible to the panel via Ethernet or MPI. Perform a memory reset on the panel before re-transferring if corruption is suspected.

Communication fault with PLC displayed on screen

Check the physical MPI or PROFIBUS DP cable connections and termination resistors. Verify the panel's configured PLC address matches the actual PLC station address.

Correct any wiring faults, ensure proper bus termination at both ends of the PROFIBUS segment, and confirm address settings in the WinCC flexible project match the PLC configuration.

Function keys do not respond or LEDs do not illuminate

Check for physical damage to the keypad membrane. Verify in the project configuration that the function keys are correctly assigned to actions or scripts.

If key assignments are correct and the hardware is undamaged, the keypad membrane or front panel assembly may need replacement. Contact a qualified repair service.

Panel reboots repeatedly or freezes during operation

Check the 24 V DC supply for voltage dips or instability under load. Inspect for excessive ambient temperature exceeding the 0-50 °C operating range.

Stabilize the power supply using a dedicated 24 V DC source with adequate current capacity. Ensure adequate ventilation around the panel to keep operating temperature within specification.

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