GE GFK-1541B manual LEDs, Ethernet Restart Pushbutton

2

LEDs

There are four LEDs on the CPU364: EOK, LAN, STAT, and PS PORT (on some early models of the CPU364, the PS PORT LED is labeled “SNP”). The PS (Power Supply) PORT LED is not Ethernet related; it indicates the presence of serial traffic through the serial port of the PLC’s power supply. Each of the three Ethernet LEDs (EOK, LAN, and STAT) can be ON, OFF, BLINKING slow, or BLINKING fast. They indicate the state of the Ethernet Interface, traffic on the network port (LAN LED), and that an exception event has occurred.

The three Ethernet LEDs are briefly turned ON whenever a restart is performed in the Operational state by pressing and releasing the Restart pushbutton (described below). This allows you to verify that the Ethernet LEDs are operational.

Ethernet Restart Pushbutton

The Ethernet Restart pushbutton serves four functions: LED test, Restart, Restart and enter Software Load state, and Restart and enter Maintenance state. These four functions behave similarly in all states except for the Software Load state. While in this state, pressing the pushbutton will cause an immediate restart into the Operational state (without performing the LED test) if the software in the Ethernet Interface has not been corrupted or erased. If the software has been corrupted or erased, pressing the pushbutton will cause an immediate restart back into the Software Load state. The following text describes Restart pushbutton behavior while not in the Software Load state.

Pressing the Ethernet Restart pushbutton will disrupt Ethernet communications.

LED Test: Any time the Ethernet Restart pushbutton is released, the three Ethernet LEDs flash ON. The operator should visually verify that the three LEDs go OFF and then ON at this time. Then the Interface performs either a restart, a restart and enter Software Load state, or a restart and enter Maintenance state, depending on the duration that you press the pushbutton.

Restart: Pressing the Ethernet Restart pushbutton momentarily (less than 5 seconds) requests a restart of the Ethernet Interface. When the Restart pushbutton is pressed, the three Ethernet LEDs go out. When it is released, the three Ethernet LEDs flash ON, then power-up diagnostics run, and the software on the Interface is restarted into the Operational state.

GFK-1541B Chapter 2 Installation 2-17