Rockwell Automation 1395 Node Adapter Board - Manual (Page 14)

Chapter 3
Functional Description
3-2
General The Node Adapter Board does not scale or manipulate data that is
transferred between the drive and PLC Controller. As a result, there are no
scaling parameters associated with the Node Adapter in the drive. If data in
the PLC Controller is manipulated in units other than drive units, the data
must first be converted to drive units before being sent to the drive. All
scaling of data must be performed in the PLC Controller program. To allow
data to be input to the drive control after entering through the Node
Adapter, linking of the source and sink parameters must be setup and
stored in the drive. Refer to Chapter 3 of the Bulletin 1395 Installation and
Maintenance Manual for a description of configuration.
Discrete PLC Controller I/O The selected rack size (determined by U5, switches SW7 & SW8) and
Data Transfer Adapter Board Port (A or B) determine which port parameters in the drive
are used for transfer of data between the PLC Controller and drive. The
first group number associated with every rack number is reserved for the
block transfer function. The remainder of the group numbers (1–7 for full
racks, 1–3 or 5–7 for half racks) are used for the transfer of discrete type
PLC Controller data. Each group number reserves a single 16 bit word in
both the input and output image table of the PLC. All 16 bits of each 16 bit
word are directly linked to a source or sink parameter in the drive through
the Node Adapter Board as shown in Figure 3.1.
The parameters associated with each group number are predefined and
depend on which adapter port the Node Adapter Board is connected to. For
example, if the Node Adapter Board is connected to Port B, parameter 300
will contain the 16 bit word associated with group 1 of the PLC Controller
output image table. In other words, the 16 bits of parameter 300 are
mapped directly from the 16 output bits associated with group 1 in the PLC
output image table.
The data type of the 16 bit word associated with each of the groups is
determined by the drive configuration. For example, if parameter 300 is
linked to a bit coded parameter such as Logic Cmd 1 (Parameter 150), then
the bits associated with group 1 in the output image table of the PLC
Controller are mapped directly into Parameter 150. Therefore, these bits
are associated with the logic control of the drive and the PLC Controller
program must treat them as such. Likewise, if Parameter 303, which is
associated with group 4 of the output image table is linked to the Velocity
Ref Whole (Parameter 154), then the data being sent to the 16 bits
associated with group 4 of the output image table must be in the form of a
16 bit integer word. This is because Parameter 154 is a 16 bit integer word.