Rockwell Automation 1395 Digital DC Drive FRN 5-10.10/9.30 - Manual (Page 98)

Chapter 5
Functional Description
5-12
The specific function and data requirements for each source parameter
associated with the ports is defined by the Sink parameter from the control
firmware to which it is linked. For example, in Figure 5.3, Parameter 400
is linked to Parameter 151 (Logic Cmd 2). Because Logic Cmd 2 has been
pre-defined as a 16 bit control word, parameter 400 must be handled by the
Adapter Board, and in turn by the external control devices, as the 16 bit
control word Logic Cmd 2 (i.e. parameter 400 takes on the meaning of
Logic Cmd 2).
The same condition is true for Sink parameters associated with the
Microbus Ports. For this reason, Sink and Source parameters associated
with the ports have no meaning until they are linked to Source and Sink
parameters from the control logic. Information may be flowing between the
hardware connected to the Adapter Boards and the Source and Sink
parameters associated with the corresponding Microbus Port, but until the
Sink and Source parameters associated with the port are linked to control
logic Source and Sink parameters, no transfer of data to the drive control
will occur.
Example Configuration Using Discrete Adapter Board – Figure 5.4
shows a Discrete Adapter Board connected to Port A. The Discrete
Adapter Board provides for up to four 24VDC/115VAC digital inputs, four
analog inputs, two digital output contacts, and four analog outputs. Wiring
to the actual discrete devices is provided through terminal TB3 in the drive
package. Logic in the drive allows for scaling of input information for
each analog input, before it is sent to the respective Source parameters.
There are four Source parameters associated with the analog inputs,
(Parameters 401 – 404 for PortA and Parameters 301 – 304 for Port B).
The four digital inputs to the drive are all sent to bits in a single 16 bit
word which is to be used as a logic command input word. Parameters 400
for Port A and 300 for Port B are used for this purpose. Each of the four
digital inputs to the Discrete Board can be configured to go to any of the 16
bits in the logic word for each port. The hardware of the Discrete Board,
therefore, defines the possible usage for each of the Source and Sink
parameters associated with the specific Port to which the Board has been
connected.
In Figure 5.4 the Discrete Board has been connected to Port A, so only the
Port A Source and Sink Parameters are defined by the hardware of the
Discrete Board. Parameter 400, by definition of the Discrete Board must
be linked in the Drive to to one of the logic command Sink parameters. In
this example, Parameter 400 is linked to Parameter 151, Logic Command
2, so the four digital inputs to the Discrete Board will directly control four
of the bits in Logic Command 2. Parameter 401, which is associated with
the first analog input to the Discrete board is linked to Parameter 154,
which means the analog signal entering the Discrete Board is defined as the
External Velocity Reference input to the Control Logic.