Siemens 6AV6355-1AA47-7EM2 OP 77B

€ 1.995,00

SKU: 6AV6355-1AA47-7EM2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EM2 is an operator panel belonging to the SIMATIC HMI OP 77B series, manufactured by Siemens as part of its established range of compact operator panels for industrial human-machine interface applications. This unit provides a monochrome display with keypad-based operation, designed for straightforward process visualization and control tasks. It is a member of the SIMATIC HMI Basic Panels generation, intended for use with Siemens SIMATIC S7 PLCs and compatible controllers.

The OP 77B features a 4-line STN monochrome LCD display capable of showing text and simple graphics, with a membrane keypad for operator input including function keys and system keys. It supports MPI and PROFIBUS DP communication interfaces for direct connection to SIMATIC S7-200, S7-300, and S7-400 controllers. The panel operates on a 24 V DC supply and is rated to IP65 on the front face, providing protection against dust and water ingress in industrial environments. Configuration is performed using Siemens WinCC flexible or STEP 7 Micro/WIN software.

The OP 77B is widely deployed in machine-level control panels across manufacturing, process automation, and material handling industries where a cost-effective, robust operator interface is required. Its compact form factor and keypad-based operation make it suitable for applications where touchscreen interaction is not necessary and where panel space is limited. Typical installations include conveyor systems, packaging machinery, pumping stations, and general-purpose machine control cabinets.

Technical Specifications

Display Type	STN monochrome LCD
Display Lines	4 lines of text
Input/Operating Voltage	24 V DC
Communication Interface	MPI, PROFIBUS DP
IP Rating (Front)	IP65
IP Rating (Rear)	IP20
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10 % to 90 % (non-condensing)
Mounting	Panel mounting
Certifications	CE, UL, cULus
Compatible Controllers	SIMATIC S7-200, S7-300, S7-400
Configuration Software	WinCC flexible, STEP 7 Micro/WIN

Common Error Codes and System Events

Event ID: 10000: Communication error between the OP 77B and the connected PLC. The panel cannot establish or maintain a connection to the controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings match the configuration in WinCC flexible. Ensure the PLC is powered and in RUN mode.
Event ID: 10001: Connection to the configured PLC address has been lost during operation.
Inspect the communication cable for damage or loose connectors. Verify bus termination at both ends of the network. Check for address conflicts on the MPI or PROFIBUS network.
Event ID: 20000: Project download error. The configuration project could not be transferred to the panel successfully.
Verify the PC-to-panel connection cable is correctly seated. 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 error or corrupted project data detected on the panel.
Perform a factory reset of the panel and re-download the project from WinCC flexible. If the error persists, check the internal memory for hardware faults.
Event ID: 50000: Configuration mismatch. The loaded project is not compatible with the firmware version installed on the panel.
Update the panel firmware to the version required by the WinCC flexible project, or recompile the project using a compatible version of WinCC flexible and re-download.
Event ID: 60000: Power supply undervoltage detected. The supply voltage has dropped below the minimum operating threshold.
Measure the 24 V DC supply at the panel connector. Ensure the power supply unit is rated for sufficient current. Check wiring for voltage drop across long cable runs.

Frequently Asked Questions

What communication interfaces does the OP 77B support?

The OP 77B supports MPI and PROFIBUS DP interfaces, allowing direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs without an additional communication module.

What software is required to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible (for S7-300/400 applications) or STEP 7 Micro/WIN (for S7-200 applications). Projects are downloaded to the panel via a PC adapter cable.

What is the supply voltage for the 6AV6355-1AA47-7EM2?

The panel requires a 24 V DC power supply. The supply must be within the specified tolerance range to ensure reliable operation.

What is the front panel protection rating of the OP 77B?

The front face of the OP 77B is rated to IP65, providing protection against dust ingress and low-pressure water jets, making it suitable for industrial panel door mounting.

Can the OP 77B be used with S7-1200 or S7-1500 PLCs?

The OP 77B is not natively compatible with S7-1200 or S7-1500 PLCs, as it predates the TIA Portal generation. It is designed for use with S7-200, S7-300, and S7-400 controllers via MPI or PROFIBUS DP.

Troubleshooting

Display remains blank after power is applied

Check the 24 V DC supply voltage at the panel power connector using a multimeter. Verify polarity is correct and that the supply is within the specified voltage range.

Correct any wiring errors or replace the power supply unit if the output voltage is out of specification. If the supply is correct and the display remains blank, the internal power supply board or display assembly may require replacement.

Panel displays communication error and cannot connect to the PLC

Verify the MPI or PROFIBUS DP cable is correctly connected at both the panel and PLC ends. Check that bus termination resistors are active at both ends of the network segment and that there are no address conflicts.

Replace or reseat the communication cable. Correct any address conflicts in the network configuration. Ensure the PLC is powered and in RUN or STOP mode and that the configured PLC address in the WinCC flexible project matches the physical PLC address.

Project download fails or transfer mode cannot be entered

Confirm the panel is set to transfer mode either via the panel menu or by holding the appropriate key combination during startup. Verify the PC adapter cable is correctly connected and the correct COM port is selected in WinCC flexible.

Restart the panel and re-enter transfer mode. Try a different PC adapter cable or USB port. Ensure the WinCC flexible project is compiled without errors before attempting the transfer.

Keypad buttons are unresponsive or intermittently fail

Inspect the membrane keypad for physical damage, contamination, or wear. Check the internal ribbon cable connection between the keypad membrane and the main PCB.

Clean the keypad surface with a dry cloth. If individual keys have failed due to wear, the membrane keypad assembly should be replaced. Reseat the internal ribbon cable connector if accessible during repair.

Panel reboots unexpectedly during operation

Monitor the 24 V DC supply voltage under load for voltage dips or ripple. Check the ambient temperature in the control cabinet to ensure it is within the panel operating range of 0 to 50 degrees C.

Improve the stability of the 24 V DC supply by using a higher-rated power supply or adding capacitive buffering. Improve cabinet ventilation if overtemperature is suspected. If reboots continue, inspect the internal components for signs of damage or failing capacitors.

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