Rockwell Automation 1395 ControlNet Communication Board - Manual (Page 20)

3–6 Configuration & PLC Interfacing
Publication 1395–5.37– March, 1999
Discrete PLC Controller Figure 3.4 illustrates an application where the 6 bit words for group
I/O Example 1 and 2 are being used by the PLC Controller program for data transfer
with the Drive. In this example, the Drive has been configured so that
the data coming into source parameter 300 is sent to Logic Cmd 1
(parameter 150). Information sent to the Drive Using the 16 bit output
word for group 1 of rack 2 must therefore be a 16 bit logic word where
the bits are defined by the description of parameter 150.
Figure 3.4. Discrete PLC Controller I/O Example
Output Image Table
PLC (Rack 2)
Control Net Scheduled
Data Interface
BULLETIN 1395 DRIVE
300
150
Group 0
Group 1
Group 2
Group 3
Group 4
Group 5
Grpup 6
Group 7
Sinks
Logic Cmd 1
Port B
Sources
151
Logic Cmd 2
152
Logic Cmd 3
154
External Vel Ref
301
Sources
Group 0
Group 1
Group 2
Group 3
Group 4
Group 5
Grpup 6
Group 7
Input Image Table
100
Logic Status
101
Drive Status
350
351
106
112
Velocity Fdbk
Arm Current Fdbk
Port B
Sinks
Scheduled
Discrete
Data
Transfer
User
Configurable
Links
In a similar manner, the External Velocity Ref (parameter 154) has
been linked to source parameter 301. The 16 bit output word for group
2 of rack 2 must be a 16 bit signed integer whose value corresponds to
the allowable values in Drive Units for parameter 154.
Information from the Drive consists of Logic Status (parameter 100)
and Velocity Fdbk (parameter 106). Based on the links shown in
Figure 3.2, the 16 bit input word for group 1, rack 2 in the PLC
Controller is a 16 bit logic status word. The bits in this 16 bit word are
defined by the description for parameter 100. In addition, the 16 bit
input for group 2, rack 2 in the PLC Controller is a 16 bit signed