Siemens 6AV6355-1AA47-7ES4 OP 77A

€ 3.495,00

SKU: 6AV6355-1AA47-7ES4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7ES4 is an operator panel belonging to the SIMATIC HMI OP 77A series, designed for human-machine interface applications in industrial automation environments. This unit provides a compact, panel-mounted display and control interface for monitoring and operating automated systems. It is part of Siemens' SIMATIC HMI product line, which integrates seamlessly with the broader SIMATIC automation ecosystem.

The OP 77A features a monochrome STN LCD display with a resolution of 128 x 64 pixels, providing clear visualization of process data, alarms, and operator prompts. It supports communication via MPI and PROFIBUS DP interfaces, enabling direct connection to SIMATIC S7 PLCs and other compatible controllers. The panel includes a membrane keypad with function keys for operator input, and is configured using WinCC flexible or ProTool engineering software. It operates on a 24 V DC supply and is rated to IP65 on the front face for protection against dust and water ingress.

The OP 77A is commonly deployed in machine-level control applications across manufacturing, packaging, food and beverage, and general industrial automation sectors. Its compact form factor and robust construction make it suitable for installation in control cabinets and machine panels where space is limited. The direct PROFIBUS DP and MPI connectivity makes it a practical choice for retrofitting or extending existing SIMATIC S7-based control systems.

Technical Specifications

Display Type	Monochrome STN LCD
Display Resolution	128 x 64 pixels
Display Size	4 inch
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)
Mounting	Panel mounting
Configuration Software	WinCC flexible, ProTool
Certifications	CE, UL
Series	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 10000: Communication error between HMI panel and PLC. The configured connection to the controller cannot be established or has been lost.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify PLC is powered and running. Confirm station address settings match the project configuration.
Event ID: 10001: Connection to PLC interrupted during runtime. Data exchange has stopped.
Inspect physical bus connections and cable integrity. Check for address conflicts on the bus. Restart the HMI panel after resolving the connection issue.
Event ID: 20000: Tag read error. The HMI panel cannot read a configured tag from the PLC.
Verify the tag address exists in the PLC program and the data block is present. Check that the PLC is in RUN mode and the address range is valid.
Event ID: 20001: Tag write error. A write operation to a PLC tag has failed.
Confirm the PLC tag is not write-protected and the address is correct. Ensure the PLC is in RUN mode and the communication link is active.
Event ID: 40000: Project download error. Transfer of the project configuration to the panel has failed.
Check the transfer cable connection and PC interface settings. Ensure the panel is in transfer mode before initiating the download. Retry the transfer.
Event ID: 50000: Internal device error. A hardware or firmware fault has been detected within the HMI panel.
Perform a power cycle of the panel. If the error persists, perform a factory reset and reload the project. Contact Siemens support if the fault remains.
Event ID: 60000: Alarm buffer overflow. The number of pending alarms has exceeded the panel's alarm buffer capacity.
Acknowledge and clear existing alarms in the alarm view. Review the alarm configuration to reduce unnecessary alarm triggers or increase acknowledgement frequency.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

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 and S7-1500 controllers depending on firmware and configuration.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible or the older ProTool engineering software. Projects are created on a PC and downloaded to the panel via a PC/PPI or MPI cable.

What is the supply voltage for the 6AV6355-1AA47-7ES4?

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

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

The front face of the OP 77A is rated to IP65, providing protection against dust ingress and low-pressure water jets, making it suitable for industrial panel mounting.

Can the OP 77A display graphics and trend curves?

The OP 77A supports basic graphics and bar graphs on its monochrome display, but advanced trend curves and complex graphical objects are limited due to the 128 x 64 pixel resolution and monochrome screen.

Troubleshooting

Display remains blank after power on

Measure the 24 V DC supply voltage at the power connector on the rear of the panel. Check for blown fuses or wiring faults in the supply circuit.

Restore the correct 24 V DC supply. If the supply is present and the display remains blank, the internal power supply or LCD backlight may have failed, requiring panel repair or replacement.

HMI panel shows persistent communication error with PLC

Check the MPI or PROFIBUS DP cable connections at both the panel and PLC ends. Verify bus termination is correctly applied at both ends of the bus segment. Confirm the station addresses configured in the project match the physical settings.

Replace or reseat the communication cable. Correct any address mismatches in the WinCC flexible project and re-download. Ensure only the two physical end nodes have bus termination resistors enabled.

Project transfer to panel fails or times out

Confirm the panel is set to transfer mode before initiating the download from the PC. Check the PC interface settings and that the correct COM port or USB adapter is selected.

Set the panel to transfer mode via the Start Center menu. Verify the PC adapter driver is correctly installed and the baud rate matches. Retry the project download.

Keypad buttons are unresponsive or intermittent

Inspect the membrane keypad for physical damage, contamination, or wear. Check the internal ribbon cable connection between the keypad and the main board if the panel has been opened previously.

Clean the keypad surface with a dry cloth. If keys remain unresponsive, the membrane keypad assembly may require replacement. Reseat the ribbon cable connector if accessible.

Panel repeatedly restarts or enters bootloader mode unexpectedly

Check the supply voltage for instability or voltage dips below the minimum operating threshold. Inspect for corrupted project data or incomplete firmware on the device.

Stabilise the 24 V DC power supply. Perform a complete firmware update and re-download the project using WinCC flexible. If restarts continue, the panel may have a hardware fault requiring service.

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