Rockwell Automation 1738-ADNX ArmorPoint I/O DeviceNet Adapters - Manual (Page 93)

Publication 1738-UM001A-EN-P - February 2005
Quick Start For the 1738-ADNX B-19
Inputs and Outputs
1. Select the Input tab. A single word is 16 bits. Notice that the
mapping is as expected.
• The first two bytes (1 byte = 8 bits) are reserved as read only.
• The first word is completely used, so the 1738-IB4M12 can map
to the beginning of the next word (byte 2, bit 0).
• There is a space between the 1738-IB4M12 and the
1738-OB4EM12 because the next word does not start until byte
4.
This field describes how the
data is transferred between
the I/O modules and the
adapter on the PointBus
Subnet.
The first 2 bytes are
reserved for status.
Use the scroll bar as
needed to see all of the
data.
The current memory
buffer selected is
COS/Cyclic. There are
also buffers for Polled
and Strobed. This is
how the data will be
transferred to the
scanner (1756-DNB in
this example).
Note the mapping in the
1738-ADNX Scanner is
shown in byte
increments. The
1756-DNB displays in
double words (4 bytes).