Siemens 6AV6355-1AA47-7EH5 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7EH5 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EH5 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for human-machine interface applications in industrial automation environments. This unit is part of Siemens' compact operator panel lineup, providing a cost-effective and reliable interface solution for machine-level control and monitoring. The OP 77A series is developed and manufactured by Siemens AG as part of the SIMATIC HMI product portfolio.

The OP 77A features a monochrome STN LCD display with a resolution of 160 x 80 pixels, capable of displaying text and simple graphics for process visualization. It supports MPI and PROFIBUS-DP communication interfaces, enabling direct integration with SIMATIC S7 PLCs. The panel includes a membrane keypad with function keys, numeric keys, and system keys for operator input, and operates on a 24 V DC power supply. Configuration is performed using Siemens WinCC flexible or STEP 7 Micro/WIN software.

The OP 77A is widely deployed in machine-level automation across industries such as manufacturing, packaging, food and beverage, and material handling. Its compact form factor and robust membrane keypad make it suitable for installation in control cabinets and machine panels where space is limited. The panel is particularly suited for applications requiring straightforward text-based process monitoring and parameter adjustment without the need for full graphical visualization.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Colors	Monochrome (blue/white)
Input Voltage	24 V DC
Voltage Range	19.2 V DC to 28.8 V DC
Communication Interface	MPI, PROFIBUS-DP
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
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Configuration error: No project loaded or project data is corrupted on the operator panel.
Reload the project using WinCC flexible or STEP 7 Micro/WIN. Verify the project file integrity before transfer.
Event ID: 10001: Communication error: Connection to the PLC cannot be established or has been lost.
Check MPI or PROFIBUS-DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration.
Event ID: 10002: Tag read error: The panel cannot read a configured tag from the connected PLC.
Verify the tag address in the project configuration matches the actual PLC data block or memory address. Check PLC program is running.
Event ID: 10003: Tag write error: The panel cannot write a value to the configured PLC tag.
Check that the target PLC memory area is not write-protected. Verify the tag address and data type are correctly configured in the project.
Event ID: 10004: System memory low: Available memory on the operator panel is insufficient for the current project.
Reduce the project size by removing unused screens, tags, or alarm entries. Transfer a simplified project to the panel.
Event ID: 10005: Transfer mode active: The panel is waiting for a project download from the configuration PC.
Initiate the project transfer from WinCC flexible or STEP 7 Micro/WIN, or press the appropriate key combination to exit transfer mode and resume normal operation.
Event ID: 10006: Alarm buffer overflow: The number of pending alarms exceeds the panel's alarm buffer capacity.
Acknowledge and clear existing alarms. Review the alarm configuration to reduce the frequency of alarm triggers or increase acknowledgment intervals.

Frequently Asked Questions

What communication interfaces does the OP 77A support?

The OP 77A supports MPI and PROFIBUS-DP interfaces, allowing direct connection to Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs.

Which software is used to configure the Siemens 6AV6355-1AA47-7EH5?

The OP 77A is configured using Siemens WinCC flexible (compact edition or higher) or STEP 7 Micro/WIN for S7-200 applications. The project is then transferred to the panel via the MPI or PROFIBUS-DP interface.

What is the supply voltage for this operator panel?

The panel operates on 24 V DC with an acceptable input range of 19.2 V DC to 28.8 V DC.

What is the IP protection rating of the OP 77A?

The front face of the OP 77A is rated IP65, providing protection against dust and water jets. The rear of the unit is rated IP20.

Can the OP 77A display graphical images or only text?

The OP 77A is primarily a text-based operator panel. Its 160 x 80 pixel monochrome display supports text and simple bar graph elements, but it is not designed for full graphical or bitmap image display.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the power connector. Check that the voltage is within the 19.2 V to 28.8 V range. Inspect the internal fuse if accessible.

Restore the supply voltage to within specification. If voltage is correct and display remains blank, the internal power supply or display backlight may have failed and the unit should be sent for repair or replacement.

Panel shows 'No project' or boots into transfer mode on every startup

The internal flash memory may not contain a valid project, or the project transfer was incomplete during the last download attempt.

Reconnect the configuration PC and perform a full project transfer using WinCC flexible. Ensure the transfer completes without interruption before disconnecting.

Communication fault displayed; PLC connection lost intermittently

Check the MPI or PROFIBUS-DP cable for physical damage, loose connectors, or missing bus termination resistors at both ends of the network segment.

Replace damaged cables, secure all connectors, and ensure bus termination is correctly installed at both ends of the MPI or PROFIBUS-DP segment. Verify baud rate and station address settings match on both the panel and PLC.

Membrane keypad keys not responding or responding incorrectly

Inspect the keypad surface for physical damage, contamination, or deformation. Test each key systematically using a panel diagnostic or input test screen if available in the project.

Clean the keypad surface with a dry cloth. If keys are physically damaged or the membrane is torn, the keypad membrane assembly requires replacement. Contact a qualified repair service for membrane replacement.

Alarm messages not appearing on the panel despite fault conditions in the PLC

Verify that the alarm tags in the WinCC flexible project are correctly mapped to the PLC bit addresses that are set during fault conditions. Check that the PLC program is correctly setting the alarm bits.

Review and correct the alarm tag configuration in WinCC flexible. Retransfer the updated project to the panel and confirm alarm triggering by forcing the relevant PLC bits during a test.

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