Siemens 6AV6355-1AA47-7ER3 OP 77B

€ 3.495,00

SKU: 6AV6355-1AA47-7ER3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7ER3 is an operator panel belonging to the SIMATIC HMI OP 77B series, manufactured by Siemens. It is a compact, key-operated panel designed for machine-level human-machine interface applications, providing operators with a straightforward means of monitoring and controlling industrial processes. This unit is part of the broader SIMATIC HMI portfolio and is intended for integration into control cabinets or machine fronts.

The OP 77B features a monochrome LCD display with a resolution of 160 x 64 pixels, capable of displaying text and simple graphics. It communicates via MPI, PROFIBUS DP, and optionally via RS-422/RS-485 interfaces, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs without an additional communication module. The panel is configured using WinCC flexible software and supports recipe management, alarm logging, and trend display functions. It operates on a 24 V DC supply and is rated IP65 at the front panel, providing protection against dust and water jets in industrial environments.

The OP 77B is commonly deployed in manufacturing, packaging, and process automation applications where a cost-effective, robust operator interface is required at the machine level. Its compact form factor and membrane keypad make it suitable for installation in confined spaces on machine fronts or control cabinet doors. Industries such as food and beverage, automotive assembly, and general factory automation frequently use this panel for local operator control and status monitoring.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 64 pixels
Number of Lines	4 lines of text
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.8 W
Communication Interface	MPI, PROFIBUS DP, RS-422/RS-485
IP Protection Rating (Front)	IP65
IP Protection 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
Configuration Software	WinCC flexible 2005 or higher
Certifications	CE, UL, cULus

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 panel configuration in WinCC flexible.
Event ID: 10001: PLC is not responding within the configured timeout period.
Verify the PLC is powered and in RUN mode. Check network cabling and confirm the baud rate settings on both the panel and PLC match.
Event ID: 20000: Configuration download error. The project data could not be transferred to the panel successfully.
Check the transfer cable connection between the PC and the panel. Ensure the panel is in transfer mode and that the WinCC flexible project is compatible with the OP 77B firmware version.
Event ID: 40000: Alarm buffer overflow. The number of pending alarms has exceeded the panel's alarm buffer capacity.
Acknowledge and clear existing alarms. Review the alarm configuration in WinCC flexible to reduce the number of simultaneously active alarms or increase the buffer size if possible.
Event ID: 50000: Recipe data error. A recipe record could not be read or written correctly.
Check the recipe configuration in WinCC flexible. Verify that the PLC data blocks referenced by the recipe are correctly defined and accessible.
Event ID: 60000: System memory low. The panel's available memory for runtime data is critically low.
Reduce the number of active tags, alarms, or recipe entries in the project. Transfer an optimized project to the panel.
Event ID: 70000: Firmware update error. The firmware update process was interrupted or failed.
Repeat the firmware update procedure using the correct firmware version for the OP 77B. Ensure a stable power supply during the update process.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B panel?

The OP 77B is compatible with SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with S7-200 via RS-422/RS-485 using the PPI protocol.

What software is required to configure the OP 77B?

The OP 77B is configured using Siemens WinCC flexible 2005 or a later version. The project is then downloaded to the panel via a PC adapter cable or PROFIBUS connection.

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

The front panel of the OP 77B is rated IP65, providing full protection against dust ingress and protection against water jets from any direction.

Can the OP 77B display graphical elements or only text?

The OP 77B can display both text and simple graphics on its 160 x 64 pixel monochrome LCD, including bar graphs and trend curves in addition to alphanumeric text.

What is the supply voltage required for the OP 77B?

The OP 77B requires a 24 V DC supply voltage, which is the standard control voltage used in SIMATIC automation systems.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the panel's power connector. Check that the supply is within the specified tolerance range.

Ensure the 24 V DC supply is stable and correctly connected. If the supply is correct and the display remains blank, the internal power supply or LCD backlight may be faulty and the unit may require repair or replacement.

Panel shows 'No connection to PLC' message

Check the MPI or PROFIBUS DP cable between the panel and the PLC. Verify the bus termination resistors are correctly placed at both ends of the network.

Replace or reseat the communication cable. Confirm that the PLC station address and baud rate in the WinCC flexible project match the actual PLC configuration. Ensure the PLC is powered and in RUN mode.

Project download fails or transfer mode cannot be activated

Verify that the panel is set to transfer mode by navigating to the system menu. Check the PC adapter cable connection and the COM port settings on the PC.

Restart the panel and re-enter transfer mode. Use the correct PC adapter (USB or MPI) and ensure the WinCC flexible transfer settings match the panel's communication parameters.

Alarms are not displayed or acknowledged correctly

Check the alarm configuration in WinCC flexible, including the trigger tags and bit addresses. Verify that the PLC is writing to the correct alarm trigger bits.

Correct any mismatched tag addresses in the WinCC flexible project and re-download the project to the panel. Ensure the PLC program is correctly setting and resetting alarm bits.

Panel keypad buttons are unresponsive

Inspect the membrane keypad for physical damage or contamination. Test each key in the panel's diagnostic or system menu if accessible.

Clean the keypad surface with a dry cloth. If individual keys remain unresponsive after cleaning, the membrane keypad assembly may be worn or damaged and should be replaced.

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