Hitachi S10VE, User Manual

Page: 433 / 506

13. Troubleshooting
13-88
13.2.3.2 Detailed check items
Check the items in Table 13-34 with respect to locations for which a timeout occurred.
(1) Check items for when a failure occurs repeatedly
Table 13-34 Check items for when a failure occurs repeatedly
No. Item Check item Notes
1 Detailed check
items 1 Are the I/O points and optical adapter settings for the
remote I/O settings specified to the CPU module correct?
If any mistakes are present, correct the settings. When connecting an optical
adapter to the remote I/O line,
for
Optical adapter
connection(D) when specifying
the RI/O settings, specify
Connect .
Are the PI/O installation, FIX/FREE, and slot point
settings for the PI/O settings specified to the CPU module
correct? If any mistakes are present, correct the settings.
2 Detailed check
items 2 If the station module LED (RI/O) is off, take corrective
action according to Figure 13-23 and Table 13-35.
If the remote I/O optical adapter LEDs (OPT TX, OPT
RX, RIO TX, and RIO RX) are off, take corrective action
according to Figure 13-24 and Table 13-36.
3 Detailed check
items 3 Are the station module settings (ST.No. settings,
FIX/FREE settings, and I/O point settings) correct? If any
incorrect settings are present, correct the settings.
Are the cables connected to the terminal block loose or are
any cables disconnected? If any cabling is loose or
disconnected, tighten the cabling connected to the
terminal block or replace the cables.
Are the termination resistor screws loose or are there any
problems with the termination resistor value connection?
Correct any loose screws or mistakes in the termination
resistor value, and ensure that the cabling is correct. The termination resistor values
vary depending on the cables
that are in use.
Is the cable length for the remote I/O line correct? If the
cables are too long, use cables of the correct length. For details about cable length,
see Chapter 7.
Is the length of the optical cables less than or equal to 1
km per section? If the cables are too long, use cables of a
length that is less than or equal to 1 km.
Is the number of optical line sections less than or equal to
three? If the number of optical line sections is four or
more, lower the number of sections to three or less.