Label I/O modules with word counts
- Last UpdatedAug 29, 2024
- 1 minute read
The address of any point within the I/O data table space, in an SLC processor, is the sum of the words occupied by previous modules (to the left in the rack) of the same type. Therefore, to determine the correct address for any particular point in the I/O data table, the number of words each module will consume must be known, as listed in the table below.
|
Number of Words |
Module |
|
|
0 |
1747-L524 |
SLC-5/02 Module Processor |
|
1 |
1746-IA8 |
8-point 120VAC input module |
|
1 |
1746-OA16 |
16-point 120VAC output module |
|
1 |
1746-IA16 |
16-point 120VAC input module |
|
4 |
1746-NI4 |
4-point 20mA analog input module |
|
4 |
1746-NO4I |
4-point 20mA analog output module |
|
1 |
1746-0A8 |
8-point 120VAC input module |
|
2 |
1746-IB32 |
32-point DC input module |
Note: In the preceding table, the minimum number of words which can be consumed by a module is 1 (16-bits). This is due to the memory scheme of all Allen-Bradley processors.