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Understanding the I/O Image
Chapter 4 provides information and examples of the I/O image of the
1769-SM1 module, including Channel Enable/Status, Logic Command/
Status, Reference/Feedback, and Datalinks.
Topic
Channel Enable Words
Channel Status Words
Using Logic Command/Status
Using Reference/Feedback
Using Datalinks
The I/O image for the 1769-SM1 consists of 60 words of Inputs and 60
words of Outputs maximum, which will vary based on the I/O Config
parameter settings for each channel (Parameters 07, 24, and 41).
Table 4.A I/O Image Table
Output Image
Channel Enable Word Channel Status Word
Logic Command
Reference (low)
Reference (high)
Datalink In A1 (low)
Datalink In A1 (high)
Datalink In A2 (low)
Datalink In A2 (high)
Datalink In B1 (low)
Datalink In B1 (high)
Datalink In B2 (low)
Datalink In B2 (high)
Datalink In C1 (low)
Datalink In C1 (high)
Datalink In C2 (low)
Datalink In C2 (high)
Datalink In D1 (low)
Datalink In D1 (high)
Datalink In D2 (low)
Datalink In D2 (high)
Input Image
Logic Status
Feedback (low)
Feedback (high)
Datalink Out A1 (low)
Datalink Out A1 (high)
Datalink Out A2 (low)
Datalink Out A2 (high)
Datalink Out B1 (low)
Datalink Out B1 (high)
Datalink Out B2 (low)
Datalink Out B2 (high)
Datalink Out C1 (low)
Datalink Out C1 (high)
Datalink Out C2 (low)
Datalink Out C2 (high)
Datalink Out D1 (low)
Datalink Out D1 (high)
Datalink Out D2 (low)
Datalink Out D2 (high)
Page
4-3
4-3
4-4
4-4
4-5
Word
CH1
CH2
CH3
0
4
8
1
5
9
2
6
10
3
7
11
12
16
20
13
17
21
14
18
22
15
19
23
24
28
32
25
29
33
26
30
34
27
31
35
36
40
44
37
41
45
38
42
46
39
43
47
48
52
56
49
53
57
50
54
58
51
55
59
Chapter
Related Parameter
07 / 24 / 41 I/O Config Bit
"0000x" (bit 0)
"000x0" (bit 1)
"00x00" (bit 2)
"0x000" (bit 3)
"x0000" (bit 4)
4
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