Siemens 6AV6355-1AA47-7ER4 OP 77B

SKU: 6AV6355-1AA47-7ER4 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7ER4 is an operator panel belonging to the OP 77B series within the Siemens SIMATIC HMI product family. This compact panel operator device is designed for machine-level human-machine interface applications, providing a text-based display for process visualization and operator control. It is a member of the Micro Panel range, intended for straightforward monitoring and control tasks in industrial automation environments.

The OP 77B features a 4-line STN LCD text display capable of showing alphanumeric characters, with a membrane keypad for operator input including function keys and system keys. It communicates via MPI and PROFIBUS DP interfaces, enabling direct integration with Siemens S7-200, S7-300, and S7-400 PLCs. The unit operates on a 24 V DC supply and is configured using WinCC flexible Micro or STEP 7 Micro/WIN software. The front panel carries an IP65 protection rating, making it suitable for panel mounting in environments where dust and water ingress are a concern.

The OP 77B is widely used in machine building, conveyor systems, packaging machinery, and general factory automation where a cost-effective, compact operator interface is required. Its compatibility with the broad SIMATIC S7 controller range makes it a practical choice for OEMs and system integrators needing a reliable text panel for local operator interaction. The device is suited for applications requiring alarm display, setpoint entry, and basic process value visualization.

Technical Specifications

Display Type	STN LCD, text-based
Display Lines	4 lines
Characters per Line	20 characters
Input/Operating Voltage	24 V DC
Power Consumption	4 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
Certifications	CE, UL
Configuration Software	WinCC flexible Micro, STEP 7 Micro/WIN
Compatible Controllers	SIMATIC S7-200, S7-300, S7-400

Common Error Codes and System Events

Event ID: 10000: Configuration error – the loaded project is incompatible with the connected PLC or contains invalid configuration data.
Verify the project configuration in WinCC flexible Micro and ensure the PLC type and communication settings match the connected controller. Reload the project.
Event ID: 10001: Communication error – the HMI panel cannot establish or maintain a connection to the PLC.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address and baud rate settings match the panel configuration.
Event ID: 10002: Tag read error – a configured tag cannot be read from the PLC.
Confirm 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 addresses.
Event ID: 10003: Tag write error – the panel cannot write a value to the configured PLC tag.
Verify the tag address is writable and not write-protected in the PLC. Check communication link integrity and PLC operating mode.
Event ID: 20000: System memory low – the panel's available runtime memory is insufficient for the loaded project.
Reduce the number of screens, alarms, or tags in the project. Reload a simplified project configuration.
Event ID: 40000: Alarm buffer overflow – the alarm buffer has reached its maximum capacity.
Acknowledge and clear pending alarms on the panel. Review the alarm configuration to reduce unnecessary alarm triggers.
Event ID: 50000: Power supply voltage out of range – the 24 V DC supply voltage is outside the permissible operating range.
Measure the supply voltage at the panel connector. Ensure the power supply output is stable and within the 20.4 V DC to 28.8 V DC tolerance range.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B (6AV6355-1AA47-7ER4)?

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

What software is used to configure the OP 77B?

The OP 77B is configured using WinCC flexible Micro or STEP 7 Micro/WIN software, depending on the connected PLC type.

What is the supply voltage for this panel?

The OP 77B requires a 24 V DC power supply, with a permissible range of approximately 20.4 V DC to 28.8 V DC.

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

The front panel of the OP 77B carries an IP65 protection rating, making it resistant to dust and low-pressure water jets when correctly panel-mounted.

Can the OP 77B display graphics or only text?

The OP 77B is a text-based operator panel and displays alphanumeric characters only; it does not support graphical screen content.

Troubleshooting

Display remains blank after power on

Check the 24 V DC supply voltage at the panel's power connector using a multimeter. Verify the supply is within the 20.4 V DC to 28.8 V DC range.

Restore the supply voltage to the correct range. If voltage is correct but display remains blank, inspect the internal fuse and consider replacing the panel's power supply unit.

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

Inspect the MPI or PROFIBUS DP cable for physical damage, loose connectors, and correct bus termination at both ends of the network segment.

Replace or reseat the communication cable, verify bus termination resistors are correctly placed, and confirm that the PLC address and baud rate in the panel project match the PLC configuration.

Operator keypad buttons are unresponsive or intermittent

Inspect the membrane keypad for physical damage, contamination, or deformation. Check for any visible wear on the key surfaces.

Clean the keypad surface with a dry cloth. If keys remain unresponsive, the membrane keypad assembly requires replacement as it is not field-repairable.

Project download fails or WinCC flexible Micro cannot connect to the panel

Verify the PC-to-panel communication cable (PC/PPI or USB-to-MPI adapter) is correctly connected and the correct COM port and transfer settings are selected in WinCC flexible Micro.

Check and reinstall the adapter driver if necessary. Set the panel to transfer mode by navigating to the system menu and selecting 'Transfer'. Retry the project download.

Alarm messages are displayed in incorrect language or with garbled characters

Review the project language settings in WinCC flexible Micro and confirm the correct language is assigned to the runtime. Check that the character set used is compatible with the panel firmware version.

Reload the project with the correct language configuration. If characters remain garbled, update the panel firmware to the latest compatible version using the Siemens update tool.

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