Siemens 6AV6355-1AA47-7EQ1 OP 77A

€ 1.995,00

SKU: 6AV6355-1AA47-7EQ1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EQ1 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 interface for monitoring and controlling industrial processes. This unit is part of the SIMATIC HMI Basic Panels generation, intended for use with Siemens SIMATIC S7 and other compatible controller families.

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 communicates via MPI and PROFIBUS DP interfaces, enabling direct integration into Siemens automation networks. The panel is configured using WinCC flexible software and supports a membrane keypad with function keys for operator input. It operates on a 24 V DC supply and is rated for industrial environments with an IP65 protection rating on the front face.

The OP 77A is widely deployed in manufacturing, packaging, and process industries where a cost-effective, robust operator interface is required at the machine level. Its compact form factor and compatibility with SIMATIC S7-200, S7-300, and S7-400 PLCs make it suitable for retrofitting existing installations as well as new machine builds. The panel is commonly found on conveyor systems, pumping stations, and general-purpose machine control panels.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	160 x 80 pixels
Display Size	4 inch
Input Voltage	24 V DC
Power Consumption	4.8 W (typical)
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
Configuration Software	WinCC flexible 2008
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 1000: 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 station address matches PLC settings.
Event ID: 1003: No connection to configured PLC at startup
Verify communication parameters (baud rate, station address) in WinCC flexible project match PLC configuration. Check physical cable and connector integrity.
Event ID: 10000: System startup error — project data could not be loaded
Re-transfer the WinCC flexible project to the panel using ProSave or WinCC flexible. Check for corrupted project file.
Event ID: 10001: Internal memory error or project data integrity failure
Perform a factory reset via the panel's loader menu and re-download the project. If the fault persists, the panel may require servicing.
Event ID: 20000: Operating system or firmware error detected
Update the panel firmware using ProSave. If the error persists after firmware update, replace the panel.
Event ID: 40000: Power supply voltage out of tolerance
Measure the 24 V DC supply at the panel connector. Ensure supply voltage is within 20.4–28.8 V DC range. Check power supply unit and wiring.
Event ID: 70010: Printer or peripheral communication error
Check peripheral device connections and configuration settings within the WinCC flexible project.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A (6AV6355-1AA47-7EQ1)?

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

What software is used to configure and program the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2008 software. Projects are transferred to the panel via a PC/PPI cable or MPI connection using the ProSave utility.

What is the supply voltage for the 6AV6355-1AA47-7EQ1?

The panel requires a 24 V DC supply, with an acceptable input range of approximately 20.4 V DC to 28.8 V DC.

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

The front face of the OP 77A is rated IP65, making it suitable for environments where dust and water jets may be present. The rear of the unit is rated IP20.

Can the OP 77A display graphics and alarms?

The OP 77A can display text-based process values, simple graphics, and alarm messages on its monochrome LCD. It supports alarm logging and recipe management within the limits of its basic panel functionality.

Troubleshooting

Display remains blank after power on

Check that 24 V DC is present at the power supply terminals. Verify the supply polarity is correct. Inspect the internal fuse if accessible.

Ensure the supply voltage is within the 20.4–28.8 V DC range. Replace the power supply if voltage is absent. If voltage is correct and display remains blank, the panel backlight or internal power board may require replacement.

Panel shows 'No project' or boots to loader screen only

The panel has no valid project loaded in memory, or the project has been corrupted.

Reconnect the panel to the engineering PC running WinCC flexible 2008 and re-transfer the project using the transfer function or ProSave utility. Ensure the correct communication interface and baud rate are selected during transfer.

Communication fault to PLC displayed on screen

Check the MPI or PROFIBUS DP cable between the panel and PLC. Verify bus termination is correctly applied at both ends of the network. Confirm the station address configured in the project matches the PLC.

Replace or reseat the communication cable. Correct the station address and baud rate settings in the WinCC flexible project and re-download. Ensure only the two physical ends of the PROFIBUS segment have termination resistors enabled.

Touchscreen or function keys not responding

The OP 77A uses a membrane keypad rather than a touchscreen. Unresponsive keys may indicate a damaged membrane keypad or a software configuration issue.

Check that the function keys are correctly assigned in the WinCC flexible project. If keys are physically damaged or non-responsive despite correct configuration, the membrane keypad assembly requires replacement.

Panel repeatedly restarts or resets unexpectedly

Unstable power supply or internal hardware fault. Measure the 24 V DC supply under load for voltage dips or ripple exceeding acceptable limits.

Replace or stabilize the 24 V DC power supply. If the supply is stable and restarts continue, perform a firmware update via ProSave. If the issue persists, the panel likely has an internal hardware fault and requires repair or replacement.

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