Omron SYSMAC C200H - I;O Word Allocation

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4-1 I/O Word Allocation
Standard I/O Units Each slot of the Backplane is assigned a fixed word in memory. This word is ac-
cessible for I/O use only in the given slot. However, Standard I/O Units are avail-
able in 5-, 8-, 12-, and 16-point models. If an I/O Unit other than a 16-point model
is mounted, the unused points of that word are accessible only as “work bits” (re-
fer to the C200H Operation Manual). The number of I/O bits available for the en-
tire system, therefore, varies according to the model of I/O Units used, as well as
the model of Backplanes used. The figure below shows the relationship between
the model of I/O Unit and work bits. The shaded bits can only be used as work
bits.
00
01
02
03
04
00
01
02
03
04
05
06
07
00
01
02
03
04
05
06
07
08
09
10
11
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
5-point Units 8-point Units 12-point Units 16-point Units
05
06
07
08
09
10
11
12
13
14
15
08
09
10
11
12
13
14
15
12
13
14
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I/O Word Allocation Section 4-1
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