Siemens 6AV6355-1AA47-7CM4 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7CM4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7CM4 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for machine-level human-machine interface applications. This compact panel provides a keypad-based interface for monitoring and controlling industrial automation systems. It is part of Siemens' SIMATIC HMI portfolio, which integrates seamlessly with SIMATIC S7 PLCs and other Siemens automation platforms.

The OP 77A features a monochrome LCD display with a resolution suitable for text and simple graphic visualization, combined with a membrane keypad for operator input. It supports MPI and PROFIBUS DP communication interfaces, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 controllers. The panel is configured using WinCC flexible software and offers a compact, robust housing rated for industrial environments.

The OP 77A is widely used in manufacturing, packaging, and process automation applications where a cost-effective, reliable operator interface is required at the machine level. Its compact form factor makes it suitable for integration into control cabinets and machine panels with limited space. Industries such as food and beverage, automotive, and general machine building commonly deploy this panel for local operator control and status monitoring.

Technical Specifications

Display Type	Monochrome LCD
Display Size	4 lines x 20 characters
Input/Operating Voltage	24 V DC
Power Consumption	Max. 4.5 W
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/Protection Rating	IP65 (front), IP20 (rear)
Mounting	Panel mounting
Configuration Software	WinCC flexible 2004 or higher
Certifications	CE, UL
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Communication error between the HMI panel and the connected PLC controller
Check MPI/PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration.
Event ID: 10001: Connection to PLC lost or PLC not responding
Verify PLC is powered and running. Check communication cable integrity and connector pins. Confirm network address settings in WinCC flexible project.
Event ID: 20000: Project download error or project data corrupted
Re-download the WinCC flexible project to the panel. Ensure the correct panel type is selected in the project settings.
Event ID: 40000: Tag read/write error — a configured tag cannot be read from or written to the PLC
Verify the tag address in the WinCC flexible project matches the actual PLC memory address. Check PLC program for address conflicts.
Event ID: 70010: Illegal system state detected during panel startup
Perform a panel reset. If the fault persists, re-download the project or restore factory defaults via the panel's loader menu.
Event ID: 50001: Internal memory error or configuration memory fault
Re-download the project to the panel. If the error persists, check for hardware faults and consider panel replacement or repair.
Event ID: 60000: Operating system error or firmware fault
Update the panel firmware using ProSave or WinCC flexible. Perform a factory reset if the firmware update does not resolve the issue.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A panel?

The OP 77A supports SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with SIMATIC S7-1200 and S7-1500 controllers in some configurations using appropriate drivers.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2004 or later versions. The project is downloaded to the panel via MPI cable or a PC adapter.

What is the supply voltage for the 6AV6355-1AA47-7CM4?

The panel operates on 24 V DC supply voltage, which is the standard supply for SIMATIC HMI operator panels.

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

The front face of the OP 77A is rated IP65, making it resistant to dust and water jets, while the rear of the panel is rated IP20.

Can the OP 77A display graphics or only text?

The OP 77A is primarily a text-based operator panel with a character LCD display. It supports simple bar graphs and status indicators but is not designed for full graphical visualization.

Troubleshooting

Panel display remains blank after power on

Measure the 24 V DC supply voltage at the panel's power connector. Check for blown internal fuse or wiring fault.

Ensure the 24 V DC supply is within tolerance. Replace any blown fuse and verify correct polarity of the power supply connection.

Communication error displayed on panel — cannot connect to PLC

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

Replace or reseat communication cables. Set correct bus address and baud rate in both the WinCC flexible project and the PLC hardware configuration. Ensure only the two physical ends of the bus have termination resistors active.

Panel stuck in loader menu and will not start the project

The panel may have an incomplete or corrupted project download, or the firmware version is incompatible with the project.

Re-download the WinCC flexible project using a PC adapter via MPI. If necessary, update the panel firmware using ProSave before re-downloading the project.

Keypad buttons not responding or responding incorrectly

Inspect the membrane keypad for physical damage, contamination, or wear. Test individual keys in the panel's service/test mode if available.

Clean the keypad surface. If keys are physically damaged or non-functional, the membrane keypad assembly should be replaced by a qualified technician.

Panel displays correct data intermittently or values freeze

Intermittent communication on the MPI or PROFIBUS DP network, possibly caused by cable noise, incorrect termination, or address conflicts on the bus.

Check all cable shielding and grounding connections. Verify no duplicate bus addresses exist on the network. Replace suspect cables and ensure proper bus termination at both ends.

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