S5-115F Manual Rules Governing the Use of the S5-115F
The word is the next largest unit after the byte. It is 16 bits long. Two bytes constitute one word.
Inputs (I), outputs (Q) and flags (F).
Figure 10-36. Word-Oriented Addressing (Inputs, Outputs, Flags)
1 word= 2 bytes = 16 bits
Addressing output words
QW 124 QW 2 QW 0
. . . . Q125QB 124
QW 1 QW 3
QB4QB3QB2QB1QBO
Note
Use only even numbers in word-oriented addressing. This avoids overlaps (e.g. QW 2
and QW 3 both contain QB 3).
10.16.2 Address Grid
I/O module addressing is geared to word addresses. The odd byte address corresponds to the right
half of the word (low-order byte). The even byte address corresponds to the left half of the word
(high-order byte).
Fixed Slot Addressing
If you operate the central controller without expansion racks, you can do without the IM 306
interface for variable slot addressing. You must then use the termination connector supplied
instead of the IM 306. This assigns fixed addresses to slots 0 to 5.
Slot
Initial module address
Digital module Analog module
0
1
2
3
4
5
0
4
8
12
16
20
128
160
192
224
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Note
If you are using single-channel I/Os, the assigned address must
not
be used in the
second subunit.
EWA 4NEB 811 6148-02
10-53
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