44
4. Use the 6 DIP switch pins to set the word number from 0 to 30. As
shown in the diagram below, the word numbers are set in binary, with
pin 5 being ”1” and pin 1 being ”16.” Beginning with pin 1, turn ON the
pins required to arrive at the desired number of words. Turn ON pin 6 to
set the termination resistance if the I/O Link Unit is a terminator (the final
Unit in the System). If the Unit is not a terminator, leave pin 6 OFF.
ON
123456
168421
The following example diagram illustrates the proper DIP switch setting for
word 26.
ON
1 234 56
16 8 4 2 1
Terminator: ON
Pins 1, 2, and 4, set ON
16 + 8 + 2 =Word 26
5. After initially setting the DIP switches, an I/O table check should be per-
formed on the CPU to ensure that there are no errors in the settings.
6. Replace the cover. In addition, to prevent dirt or outside light from caus-
ing a malfunction, be sure that any unused optical fiber connectors are
covered with the protective caps. The Unit should be ready to operate
as soon as power is turned on. If it does not operate normally, refer to
3–1 Self–Diagnostic Function.
In the diagram below, a C20 CPU, a C40K CPU, a C20P I/O Unit and two I/O
Link Units can exchange data over a distance with a C500 Remote I/O Mas-
ter Unit. The C20 I/O Link Unit is set for word 28 (which accesses word 29 as
well), and the C40K I/O Link Unit is set for word 30 (which accesses word 31
as well). The C40K I/O Link Unit is also set as the terminator.
C500 CPU Rack
C500 Remote I/O Master Unit
Optical fiber cable Optical fiber cable
C20 CPU I/O Link Unit
C40K CPU C20P I/O Unit
I/O Link Unit
System Configuration
Example
Settings Section 2–8
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