Rockwell Automation 1794-ASB/E Remote I/O Adapter Module User Manual - Manual (Page 47)

3–13 Communicating with FLEX I/O Modules
Publication 1794ĆUM009D-EN-P - April 2004
00 07 10 17 00 07 10 17
0
1
2
3
4
5
6
7
I/O Group
Input Image Table Output Image Table
M0 M1 M2 M3 M4 M5 M6 M7
IL = Input Low Byte
IH = Input High Byte
OL = Output Low Byte
OH = Output High Byte
MCB = Module Control Byte
MSB = Module Status Byte
ASB/E
CĆM0 CĆM1 CĆM2 CĆM3 CĆM4 CĆM5 CĆM6 CĆM7
ASB/E
IH
OH
IL
OL
Primary
Comp.
IH IL
OH OL OH OL
OB16
IB16
OB16
IB16
OB16
Empty
M0ĆIL
M1ĆIL
M0ĆIH
M1ĆIH
CĆM0ĆOL
CĆM1ĆOL
CĆM2ĆOL
CĆM0ĆOH
CĆM1ĆOH
CĆM2ĆOH
M3ĆMCB
MCB
MSB
OE4
Empty
IE8 IB16
OB16
OH OL
OH OL
IH IL
IH IL
M4ĆMCB M4ĆMSB
CĆM5ĆOH M5ĆIH
M6ĆOL M6ĆOH
M7ĆIL M7ĆIH
CĆM6ĆIL CĆM6ĆIH
CĆM7ĆOL CĆM7ĆOH
OB16
IB16 OB16
IB16
Complementary 16Ćpoint Addressing Example
1 I/O Group
- Up to 16 modules = 1 logical rack
Legal Module Placement in 16Ćpoint Complementary
Any module or empty slot in any I/O position of the
primary chassis; input modules complemented by
output modules, or empty slots; output modules
complemented by input modules or empty slots; block
transfer modules complemented by block transfer
modules or empty slots; or empty slots
complemented by input, output, or empty slots.
MCB
MSB
M5ĆIL CĆM5ĆOL
MCB
MSB IH IL
OH OL
M3ĆMSB
CĆM4ĆMSB CĆM4ĆMCB
IE8
Note: Shaded areas represent unavailable data
Note: When programming block transfer instructions, address analog modules in the primary rack as module
1," and analog modules in the complementary rack as module 0."
Complementary Mode - 8Ćpoint
Complementary mode maximizes chassis I/O image table usage
when input modules are installed in one chassis, and output modules
are installed in a complementary chassis. This allows four modules
to occupy a single I/O group.
In complementary mode, with 8-point density, 2 digital input
modules in the primary chassis, and 2 digital output modules in the
complementary chassis, or vice versa, form an I/O group. In
addition, analog modules must be complemented by an empty base.
If higher density modules are used, only the lowest 8 bits will be
available.