Rockwell Automation 1395 DC Drive, 800-1250 Hp, FRN 5.XX-9.30 - Manual (Page 42)

Chapter 3
Functional Description
3-9
Source Parameters
Information input to a Sink parameter must originate from a Source
parameter which transmits the information through the Microbus Ports. As
shown in Figure 3.2, there are 10 Source parameters associated with each
of the ports. The specific hardware devices associated with the Source
parameters are determined by the Adapter Board which has been physically
connected to the port. For example, if a Discrete Adapter Board has been
connected to Port A, then Parameter 400 is defined as a 16 bit word, where
4 of the bits can be controlled directly by the 4 digital inputs to the board.
If a Node Adapter Board has been connected to Port B, then Parameter 300
is defined as a 16 bit word, where all 16 bits are directly controlled by the
program in the PLC. Refer to Chapter 6 for details on pre-configuration of
the 1395 drive.
The control logic also provides Source parameters which may be used to
send information to the Sink parameters associated with the Microbus
Ports. Some of the Source parameters associated with the control logic
have been shown in Figure 3.2. Table 3.B lists the Source parameters
associated with the control logic.
There are additional sets of configuration links that cross the fast and slow
parameter interface. These are called “indirect parameters”. The velocity
processor has Parameters 600 through 603 that link to fast Parameters 163
through 166. The system processor has slow Parameters 840 through 844
that link to fast Parameters 10 through 14.
Indirect Parameters – These parameters allow data to be transferred
between fast and slow parameters. There are a total of nine indirect
parameters, four for the Velocity Processor and five for the System
Processor.
The Velocity Processor parameters transfer a fast data value to a slow
parameter value. When a configuration link is made with a Velocity
Processor indirect parameter (Parameters 163 – 166), the real time data
value is transferred to the parameter number specified in the corresponding
Velocity select parameter (Parameters 600 to 603). Therefore, the real time
data value is copied to a velocity processor setup parameter.
The System Processor indirect parameters transfer a slow data value to a
fast source parameter. When a configuration link is made with a system
Processor indirect parameter (Parameters 10 to 14), the data value
programmed in the corresponding System select parameter (Parameter 840
to 844) is transferred to the indirect parameter. Therefore, a constant real
time value is established which can be modified by entering a new value in
the system select parameters.