Siemens 6AV6355-1AA47-7CJ0 OP 77A

€ 205,53

SKU: 6AV6355-1AA47-7CJ0 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CJ0 is an operator panel belonging to the SIMATIC HMI OP 77A 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 product line, which is widely deployed across automation environments worldwide.

The OP 77A features a monochrome LCD display and a membrane keypad for navigation and data entry, eliminating the need for a touchscreen interface. It supports MPI and PROFIBUS DP communication protocols, enabling direct integration with Siemens S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and offers sufficient memory for storing tags, alarms, and recipes suited to small-to-medium machine applications. The unit operates on 24 V DC supply and is rated for industrial environments with an IP65 protection rating on the front face.

The OP 77A is commonly used in machine building, packaging, material handling, and process automation applications where a cost-effective, robust operator interface is required. Its compact form factor and keypad-based operation make it suitable for installations where panel space is limited or where touchscreen operation is not practical. The panel is well suited for integration into control cabinets and machine fronts in industries such as food and beverage, automotive, and general manufacturing.

Technical Specifications

Series	SIMATIC HMI OP 77A
Display Type	Monochrome LCD
Display Size	4 inches
Keypad	Membrane keypad with function keys
Input 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)
Configuration Software	WinCC flexible
PLC Compatibility	Siemens S7-200, S7-300, S7-400
Mounting	Panel mounting

Common Error Codes and System Events

Event ID: 10000: Connection to PLC lost or communication timeout on MPI/PROFIBUS DP interface.
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify PLC is powered and running. Check configured baud rate and station address in WinCC flexible project.
Event ID: 10001: Connection to PLC established after a previous communication failure.
Informational event. No corrective action required. Monitor for recurring disconnections which may indicate cable or network issues.
Event ID: 20000: Tag read error — the panel cannot read the value of a configured tag from the PLC.
Verify the tag address exists in the PLC program and that the data block or memory area is accessible. Check for PLC program changes that may have altered the address.
Event ID: 20001: 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 match the PLC configuration.
Event ID: 40000: System memory low — available memory for runtime operation is insufficient.
Reduce the number of active tags, alarms, or recipe entries in the WinCC flexible project. Transfer a revised, optimized project to the panel.
Event ID: 50000: Project transfer initiated — the panel is in transfer mode awaiting a new project download.
Complete the project transfer from the WinCC flexible engineering station. If transfer mode was entered unintentionally, restart the panel to resume normal operation.
Event ID: 60000: Operating system or firmware error detected during panel startup.
Perform a panel reset. If the fault persists, update the panel firmware using the ProSave tool or return the unit for service.

Frequently Asked Questions

What communication protocols does the OP 77A support?

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

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible software. Projects are downloaded to the panel via MPI or a serial/USB connection using the ProSave utility.

What is the supply voltage for the 6AV6355-1AA47-7CJ0?

The panel operates on a 24 V DC supply voltage, which is standard for SIMATIC HMI operator panels in this series.

Is the OP 77A compatible with S7-1200 or S7-1500 PLCs?

The OP 77A is not natively supported with S7-1200 or S7-1500 PLCs, as those controllers are designed for use with TIA Portal-based HMI panels such as the KTP series. The OP 77A is intended for use with S7-200, S7-300, and S7-400 PLCs.

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

The front panel of the OP 77A carries an IP65 protection rating, making it resistant to dust ingress and low-pressure water jets, suitable for industrial machine-front installations.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel power connector. Check the supply polarity and ensure the cable is correctly seated. Inspect for any visible damage to the connector or panel housing.

Correct any wiring errors or supply voltage issues. If the supply is confirmed at 24 V DC and the display remains blank, the internal power supply or display backlight may have failed and the unit should be sent for repair or replacement.

Panel displays 'No connection to PLC' or communication error on startup

Verify the MPI or PROFIBUS DP cable is correctly connected and terminated at both ends. Check that the PLC station address and baud rate configured in the WinCC flexible project match the actual PLC settings.

Correct cable connections and termination. Adjust the station address and baud rate in the WinCC flexible project to match the PLC configuration, then retransfer the project to the panel.

Panel is stuck in transfer mode and will not start the runtime project

The panel may have been placed into transfer mode manually or due to a failed project download. Check the panel startup screen for transfer mode indication.

Complete a valid project transfer from WinCC flexible, or restart the panel and select 'Start' from the startup menu to exit transfer mode and load the existing project.

Function keys do not respond or produce incorrect actions

Check the WinCC flexible project configuration to confirm that the function keys are correctly assigned to the intended actions or screens. Inspect the membrane keypad for physical damage or contamination.

Correct the function key assignments in the WinCC flexible project and retransfer to the panel. If the keypad is physically damaged, the panel front membrane may need replacement.

Alarm messages are not displayed on the panel

Verify that alarm tags are correctly configured in the WinCC flexible project and that the corresponding PLC bit addresses are being set by the PLC program. Check that the alarm view object is present on the relevant screen.

Correct the alarm tag addresses in the WinCC flexible project to match the PLC program. Ensure the alarm view is configured and visible on the operator screen, then retransfer the project.

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