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Communicating with the PC Using C200H Direct Communication
Section 2-7
2-7-3 Switching the Power ON/OFF When Using C200H Direct
Communication
The NT20S-ST122-V1 functions as an I/O extension unit of the PC. Use the fol-
lowing procedure to switch the power ON and OFF.
Caution: Depending on the method used to switch the power ON and OFF, the entire sys-
tem may stop. Follow the procedure described below to switch the power ON and
OFF.
Power ON Switch the power ON as follows:
[NT20S power ON] “Connecting to Host” is displayed on the NT20S screen.. . . .
↓
[PC power ON] After “Connecting to Host” has been displayed for. . . . . . .
approximately 1 second, normal operation starts.
Note: S If the power to the PC is switched on first, the CPU of the PC is subjected to a
system reset, making operations such as programming console impossible.
Then, when the power to the NT20S is switched on, “Connecting to Host” is dis-
played on the NT20S screen for approximately 1 second, after which normal op-
eration starts.
S If the I/O connection cable is disconnected during system operation, an I/O bus
error occurs at the PC side and operation stops. If this happens, connect the I/O
connection cable and cancel the error.
Power OFF Switch the power OFF as follows:
[Switch the power supplies to the PC and NT20S off simultaneously]
The next time the power is switched ON, the NT20S dis-. . . . . . . . . . . . . . . . . . . . .
plays the screen that was displayed when the power
was switched OFF.
Note: S If the power to the NT20S is switched off first, the CPU of the PC is subjected to a
system reset, making operations such as programming console impossible.
S Switch off the system temporarily before replacing the NT20S (when a fault oc-
curs, for example). If the power to the NT20S only is switched off, the system
stops immediately and this could cause an accident or damage machinery.
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