4-1
Flex Network User Manual
4.1 Problem Solving
This section describes the Flex Network system's errors and their countermea-
sures.
Prior to locating a unit problem's cause via this chapter's section
4.1.3 Trouble-
shooting
, be sure to identify the the problem type and other basic items.
To help you with this, the Flex Network errors are classified into the following
three types:
(1) Logic Program Error
• The logic program does not run (GLC status LED: Green is not lit).
(2) Flex Network I/F Unit Error
• Communication cannot be performed with any Flex Network I/O units.
(3) Flex Network I/O Unit Error
• Signal input or output cannot be performed for an I/O unit's points (all or some).
Check Items
After finishing your preliminary check, be sure to also check the following items
before starting troubleshooting to locate the cause(s) of the problem.
•Is the correct power voltage being supplied to the GLC, I/F, and I/O units?
• Is the power supplied to the GLC and I/O unit(s) within the allowable voltage
range?
• Are all connected cable wiring and connections (communication cable, I/O
cable) secure and correct?
• Is any I/O unit terminals loose or disconnected?
• Are all I/O unit switches (rotary switch, dip switch, terminal switch) set cor-
rectly?
• Is the designated communication cable being used?
4.1.1 Prior to Troubleshooting
Chapter
4
Problems and Solutions
1. Problem Solving
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