Hitachi S10VE, Руководство пользователя

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13. Troubleshooting
13-91
(2) Check items for when a failure occurs intermittently
Table 13-37 Check items for when a failure occurs intermittently
No. Item Check item Notes
1 Detailed check
items 4 If only station modules are connected to the remote I/O line, take
corrective action according to Figure 13-25 and Table 13-38.
If you are using a remote I/O optical adapter on the remote I/O line,
take corrective action according to Figure 13-26 and Table 13-39.
Troubleshooting from the station modules
When an intermittent failure (timeout) occurs in a configuration consisting only of station modules, identify the failed
location by using the location in which the timeout occurred.
ST1 to ST3: Remote I/O station modules
Figure 13-25 Example station module connection configuration
Table 13-38 Failure analysis when a failure occurs intermittently 1
No.
Timeout
location of
occurrence
Corrective action
ST1 ST2 ST3
1 ON ON ON No action required
2 Other than the
above (1) Check the station module in which the timeout occurred, and the cabling of the station
modules around the affected module.
(2) If the termination resistor is incorrect, if the termination resistor and cabling are loose, if
a cable is being used that is of a length longer than that described in the specifications, or
some other problem is present, a station module other than the cause of the failure might
have timed out. If a timeout occurs even after the checks in (1), check the looseness of the
cabling of the termination resistor and all station modules, as well as the cable length.
(3) Replace the station module in the location for which the timeout occurred.
ON: Normal communication
ST1 ST2 ST3
RI/O
IF