Siemens 6AV6355-1CA47-7EQ1 OP 77B

€ 1.747,00

SKU: 6AV6355-1CA47-7EQ1 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1CA47-7EQ1 is an operator panel belonging to the SIMATIC HMI OP 77B series, manufactured by Siemens. It is a compact, key-operated panel designed for machine-level human-machine interface applications, providing operators with a straightforward means of monitoring and controlling industrial processes. The OP 77B series sits within Siemens' broader SIMATIC HMI portfolio and is intended for use with SIMATIC S7 and other compatible controllers.

The OP 77B features a monochrome STN LCD display and is operated via a membrane keypad, making it robust for industrial environments. It supports MPI and PROFIBUS DP communication interfaces, enabling direct integration with SIMATIC S7-200, S7-300, and S7-400 PLCs. The panel is configured using WinCC flexible software and offers a range of display elements including text messages, bar graphs, and set-point entry. It operates on a 24 V DC supply and is rated to IP65 on the front face, providing protection against dust and water ingress.

The OP 77B is widely deployed in manufacturing, packaging, and process automation environments where a cost-effective, reliable operator interface is required at the machine level. Its compact form factor and keypad-based operation make it suitable for applications where touchscreen operation is not practical, such as environments with heavy gloves or high vibration. The panel is commonly found on standalone machines, conveyor systems, and small-scale process control installations.

Technical Specifications

Display Type	Monochrome STN LCD
Display Size	4 inches
Display Colors	Monochrome (blue/white)
Input/Operating Voltage	24 V DC
Power Consumption	Max. 6 W
Communication Interface	MPI, PROFIBUS DP
IP/Protection Rating	IP65 (front), IP20 (rear)
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
Series/Product Family	SIMATIC HMI OP 77B
Certifications	CE, UL, cULus

Common Error Codes & System Events

Event ID: 10000: Connection to the PLC could not be established or has been interrupted.
Check MPI/PROFIBUS DP cable connections, verify PLC address settings, and confirm the PLC is powered and running.
Event ID: 10001: Communication error: no data transfer between the HMI panel and the configured controller.
Verify the communication parameters (baud rate, station address) in WinCC flexible match those configured on the PLC.
Event ID: 20000: Tag read error: the panel cannot read the value of a configured tag from the PLC.
Check that the tag address in WinCC flexible is correct and that the corresponding data block or memory area exists in the PLC program.
Event ID: 20001: Tag write error: the panel cannot write a value to the configured PLC tag.
Verify the tag address is correct, the PLC is in RUN mode, and the memory area is not write-protected.
Event ID: 40000: Project download error: transfer of the WinCC flexible project to the panel failed.
Check the transfer cable connection, ensure the panel is in transfer mode, and verify the correct communication interface is selected in WinCC flexible.
Event ID: 50000: Internal device error: a hardware or firmware fault has been detected.
Perform a panel restart. If the fault persists, check firmware version compatibility and consider a firmware update or panel replacement.
Event ID: 60000: Insufficient memory: the panel does not have enough free memory to load or run the project.
Reduce the project size by removing unused screens, tags, or alarm entries, then re-download the project.

Frequently Asked Questions

Which PLCs are compatible with the OP 77B (6AV6355-1CA47-7EQ1)?

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

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

The OP 77B is configured using Siemens WinCC flexible 2008 software. Projects are transferred to the panel via the MPI interface or a dedicated PC/PPI cable.

What is the supply voltage for the OP 77B?

The panel requires a 24 V DC power supply, with a maximum power consumption of approximately 6 W.

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

The front face of the OP 77B is rated to IP65, providing full protection against dust ingress and protection against low-pressure water jets.

Can the OP 77B display alarm messages?

Yes, the OP 77B supports alarm and event message display. Alarms can be configured in WinCC flexible and triggered by PLC bit or word tags.

Troubleshooting

Display remains blank after power on

Check that 24 V DC is present at the power supply terminals. Measure voltage at the panel connector and inspect for blown fuses or wiring faults.

Restore correct 24 V DC supply. If voltage is present but display remains blank, the internal power supply or backlight may have failed and the unit should be sent for repair or replacement.

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

Verify MPI or PROFIBUS DP cable is securely connected at both the panel and PLC ends. Check that the station address and baud rate configured in WinCC flexible match the PLC settings.

Correct any address or baud rate mismatches in WinCC flexible, re-download the project, and replace the communication cable if continuity testing reveals a fault.

Project transfer from WinCC flexible fails

Confirm the panel is set to transfer mode (accessible via the panel's start menu). Check the PC-to-panel cable and the selected communication port in WinCC flexible transfer settings.

Place the panel in transfer mode, select the correct COM port or MPI interface in WinCC flexible, and retry the transfer. Replace the transfer cable if the issue persists.

Keypad buttons are unresponsive or intermittently responsive

Inspect the membrane keypad for physical damage, contamination, or deformation. Check for any visible damage to the keypad ribbon connector inside the unit.

Clean the keypad surface with a dry cloth. If keys remain unresponsive, the membrane keypad assembly may need to be replaced by a qualified repair technician.

Alarm messages are not appearing on the display despite PLC fault conditions

Verify that the alarm tags in WinCC flexible are correctly mapped to the PLC memory addresses. Confirm the PLC program is setting the correct bits when fault conditions occur.

Cross-check tag addresses in WinCC flexible against the PLC program. Correct any address mismatches and re-download the project to the panel.

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