Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual - Manual (Page 47)

Assigning Addressing Modes,
Racks, and Groups
Chapter 4
4-5
16-Point I/O Modules
Sixteen-point digital discrete I/O modules have up to 16 inputs or up to
16
outputs. A 16-point I/O module uses a full word in the input or output
image table.
17 16 15 14 12 10 07 06 05 03 02 01 00 04 11 13
17 16 15 14 12 10 07 06 05 03 02 01 00 04 11 13
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
15559
This I/O group uses 16 bits of the input image table and
16 bits of the output image table.
2ĆSlot I/O Group with One 16Ćpt Input Module
and One 16Ćpt Output Module
Output
Terminals
Input
Terminals
2-Slot
I/O Group
Output ImageĆTable Word Corresponding to the I/O Group.
Input ImageĆTable Word Corresponding to the I/O Group.
Because each 16Ćpt module uses a full word in the
image table, the only type of module that you can install
in a 2Ćslot I/O group with a 16Ćpt input module is an 8Ć or
16Ćpt output module that performs a complementary
function (inputs and outputs complement each other).
Since all blockĆtransfer modules are bidirectional,
they cannot be used to complement either input or
output modules.
I O I O I O I O I O I O I O I O
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0 1 2 3 4 5 6 7
I/O Group Designation
Input/Output Designation
I/O Chassis Containing
16Ćpt Modules
Output Image Table
Input Image Table
Word #
Word #