Omron NT20S Operation Manual page 45

Description of Parts and Settings
Reference: S If "8" or "9" is set as the unit number when using CjjH, a special I/O unit error
26
When using a C200H/C200HS, C200HX/HG/HE, the words indicated below are
occupied according to the set unit number. However, since the NT20S-ST122-V1
executes processing using allocated bits and words, these words are not used for
processing.
These words can be used as internal auxiliary relays.
Unit No.
0
1
2
3
4
5
6
7

8 ( )

9 ( )

( ) Cannot be set with CjjH.
will occur.
S When an NT20S-ST122-V1 is connected to a CjjH, I/O extension units can-
not be connected. In other words, it is not possible to connect another special
I/O unit, so whatever unit number is set will not duplicate an existing one.
Word No.
100 to 109
110 to 119
120 to 129
130 to 139
140 to 149
150 to 159
160 to 169
170 to 179
180 to 189
190 to 199
Section 2-1