Siemens 6AV6355-1AA47-7EC2 OP 77A

€ 1.925,72

SKU: 6AV6355-1AA47-7EC2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EC2 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens as part of the SIMATIC HMI Basic Panels product line. This compact panel is designed for straightforward machine-level operator control and monitoring tasks, providing a reliable human-machine interface solution for industrial environments. It is a key-operated panel featuring a monochrome display and a dedicated keypad, suited for applications where touch operation is not required.

The OP 77A panel features a 4-line STN monochrome LCD display capable of showing text and simple graphics, combined with a membrane keypad for operator input. It supports the MPI and PROFIBUS DP communication interfaces, enabling direct integration with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs. The unit operates on a 24 V DC supply and is configured using Siemens WinCC flexible software. It offers a compact, panel-mount design with IP65 protection on the front face, making it suitable for use in environments where dust and water ingress are concerns.

The OP 77A is commonly deployed in manufacturing, machine building, and process automation applications where a cost-effective, robust operator interface is required. It is particularly well suited for controlling conveyor systems, packaging machinery, and general-purpose industrial machines. Its compatibility with the SIMATIC S7 PLC family and straightforward configuration via WinCC flexible make it a practical choice for OEMs and system integrators working within the Siemens automation ecosystem.

Technical Specifications

Display Type	STN monochrome LCD
Display Lines	4 lines of text
Input/Operating 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)
Mounting	Panel mounting
Configuration Software	WinCC flexible 2008 or later
PLC Compatibility	SIMATIC S7-200, S7-300, S7-400
Certifications	CE, UL
Series/Product Family	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Connection to PLC could not be established or was interrupted during runtime.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify PLC address settings match the HMI project configuration.
Event ID: 10001: Communication timeout: no response received from the configured PLC within the expected time window.
Verify PLC is powered and in RUN mode. Check network cable integrity and bus termination. Confirm baud rate settings on both HMI and PLC.
Event ID: 20000: Project download failed or project data on the panel is corrupted.
Re-download the project from WinCC flexible to the panel. Ensure the WinCC flexible version is compatible with the panel firmware version.
Event ID: 20001: Firmware version mismatch between the loaded project and the panel firmware.
Update the panel firmware to the version required by the project, or recompile the project using the WinCC flexible version matching the installed firmware.
Event ID: 40000: Internal device error detected, possibly related to hardware fault or memory issue.
Perform a factory reset of the panel. If the error persists, the panel may require repair or replacement of internal components.
Event ID: 50000: Power supply voltage is outside the specified operating range.
Measure the 24 V DC supply at the panel power connector. Ensure supply voltage is within the 20.4 V to 28.8 V DC tolerance range.
Event ID: 60000: Tag or variable limit violation: a monitored process value has exceeded its configured high or low limit.
Check the process value and the configured alarm limits in the WinCC flexible project. Acknowledge the alarm on the panel and investigate the process condition.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A panel?

The OP 77A is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP communication interfaces.

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

The OP 77A is configured using Siemens WinCC flexible 2008 or a compatible version. Projects are downloaded to the panel via a PC adapter or MPI/USB cable.

What is the supply voltage for the 6AV6355-1AA47-7EC2?

The panel operates on a 24 V DC supply, with a typical tolerance range of 20.4 V to 28.8 V DC.

Does the OP 77A support touch input?

No, the OP 77A is a key-operated panel. Operator input is performed exclusively via the integrated membrane keypad; it does not support touch screen operation.

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

The front face of the OP 77A carries an IP65 protection rating, making it resistant to dust ingress and low-pressure water jets.

Troubleshooting

Display remains blank after power is applied

Measure the 24 V DC supply voltage at the panel power connector. Check that the supply is within the 20.4 V to 28.8 V DC range. Inspect the internal fuse if accessible.

Correct the supply voltage if out of range. Replace the supply fuse if blown. If the display remains blank with correct supply voltage, the internal power supply board or display may require replacement.

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

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

Re-seat or replace the communication cable. Correct bus termination. Adjust the PLC address in the WinCC flexible project and re-download the project to the panel.

Project download from WinCC flexible fails or panel does not accept the project

Verify the WinCC flexible software version is compatible with the panel firmware. Check the PC adapter or MPI cable connection. Confirm the correct COM port or USB adapter is selected in WinCC flexible.

Update the panel firmware to match the project requirements, or adjust the project target panel version in WinCC flexible. Replace the PC adapter cable if communication is unreliable.

Keypad buttons are unresponsive or intermittently fail

Inspect the membrane keypad for physical damage, contamination, or deformation. Check the internal ribbon cable connection between the keypad and the main board if the panel is open for service.

Clean the keypad surface with a dry cloth. If the ribbon cable is loose or damaged, reseat or replace it. If the keypad membrane itself is faulty, replace the front panel assembly.

Panel reboots unexpectedly during operation

Monitor the 24 V DC supply for voltage dips or instability, particularly during machine load changes. Check for excessive ambient temperature around the panel installation.

Stabilize the power supply by using a dedicated 24 V DC rail with adequate current capacity. Ensure the panel installation location provides adequate ventilation and that ambient temperature does not exceed 50 °C.

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