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3. PROCEDURE UP TO DATA
COMMUNICATIONS DESCRIBED IN THIS GUIDEBOOK MELSEC
QnA
3 . 2
Self Test
Self test is a function that checks if the QC24 operates normally when not connected to an
external device. After installing the QC24 into the QnACPU base unit, first check its operation as
described below. Before setting the switches, or connecting the cables, always turn OFF the
power.
3.2.1
ROM/RAM/switch test
The ROM/RAM/switch test checks if the ROM/RAM operates normally and if the switch settings
are correct.
Mode switches setting
Set the CH2 mode switch to
"E"
(ROM/RAM/switch test) and the CHI mode switch to
"
1
"
.
Transmission specifications switches setting
Set the transmission specifications switches as shown in Section 3.1.2.
ROM/RAM/switch test execution
@
Stop the PC CPU.
Set the PC CPU RUN/STOP key switch to the STOP position.
@
PC CPU power ON or CPU reset
When the PC CPU power is turned ON, or the CPU is reset, the QC24 Ready signal is
turned ON and the QC24 is checked automatically.
(The Ready signal is turned ON several seconds after the power is turned ON, or the
CPU is reset.)
@
Check sequence
Carry out the checks in (1) ROM check
-+
(2) RAM check
-+
(3) switch check order.
@
End of checks confirmation
When the CHI and CH2 SD.WAIT LEDs are turned ON, the checks are complete.
Test executed result confirmation
@
Check the state of the LED display shown on the following page.
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