2–10
How Communication Takes Place and I/O Image Table Mapping
Publication 17946.5.5 - October 1996
8point Discrete Output Module (1794OA8) Image Table Mapping
Module Image
Outputs
I/O Image
Not used
Not used
Not used
Input Size
Output Size
0 or 1 Word
1 or 2 Words
Read
Write
Memory Map of 8-point Discrete Output Module Image Table –
1794-OA8
Dec. Bit
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Size
Oct. Bit
17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
Size
Not used
Read Word 1
Not used
O7
O6
O5
O4
O3
O2
O1
O0
Write Word 1
Not used
Write Word 2
Where O = Output value (where O0 corresponds to output 0, O1 corresponds to output 1, etc.)
8point Discrete Relay Output Module (1794OW8) Image Table
Mapping
Module Image
Outputs
I/O Image
Not used
Not used
Not used
Input Size
Output Size
0 or 1 Word
1 or 2 Words
Read
Write
Memory Map of 8-Point Discrete Relay Output Image Table –
1794-OW8
Dec. Bit
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Size
Oct. Bit
17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
Size
Not used
Read Word 1
Not used
O7
O6
O5
O4
O3
O2
O1
O0
Write Word 1
Not used
Write Word 2
Where O = Output value: where O0 corresponds to output 0, O1 corresponds to output 1, etc., and when bit = 0, the output is off; when bit = 1,
the output is on.