Omron V022-E3-1 Section, Power ON, Power OFF, Switch the power OFF in the following way

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Switching the power ON/OFF when using C200H direct communication

The C200H interface unit has the function of a C200H I/O extension unit. The pow- er should be switched ON/OFF in the way explained below.

Caution Depending on how the power is switched ON/OFF, the entire system may stop. Follow the correct procedure when switching the power ON/OFF.

Otherwise the system may operate unpredictably.

Power ON	Switch the power ON in the following sequence.
	Switch the NT600S power ON . . . . . . “Connecting to Host” will be displayed on
			the NT600S screen.
	￿Switch the PC power ON	. . . . . . After “Connecting to Host” has been dis-
			played on the NT600S screen for approx-
			imately 1 second, normal operation
			starts.

Reference If the power supply to the PC/Host is switched on first, the CPU of the PC/Host is subject to a system reset, disabling PC/Host operation. If the power to the NT600S is then switched ON, “Connecting to Host” will be displayed on the NT600S screen for approximately one second and then normal operation will

￿commence.

If the I/O connecting cable is disconnected during system operation, an I/O bus error will occur at the PC/Host side and operation will stop. If this happens, con- nect the I/O connecting cable and clear the error.

Power OFF Switch the power OFF in the following way.

Switch the PLC and NT600S . . . . . . The next time the power is switched ON,

power supplies OFF simulta- the NT600S will display the screen that

neouslywas being displayed when it was switched OFF.

Reference If the power supply to the NT600S is switched OFF first, the CPU of the PC/Host

￿is subject to a system reset, disabling PC operation.

The system must be stopped before replacing a defective NT600S or C200H interface unit. If only the power to the NT600S is switched OFF, the system will stop suddenly, causing accidents or damage to machinery.

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