Rockwell Automation Flex/WebPak 3000 DC Drive ControlNet, Network Communication Board, 915FK2101 - Manual (Page 31)

Programming the Drive 4-9
4.3.1 About MSG Instruction Timing
When a Typed Read message is sent to the drive, the response is returned in under
20 ms. When a Typed Write message is sent to the drive, the message is first
processed by the drive. Therefore, up to 600 ms may elapse before the response is
returned. These times are applicable only when the network update time and
unscheduled traffic bandwidth are not limiting factors.
4.3.2 About the Files You Can Access
When you send an unscheduled message to the drive, the data table address you
specify for the target device determines what drive information you want to access.
The data table address is in the form of:
Nff:eee
where: N specifies the file type as integer, ff is the file number, and eee is the
element number (word).
The network option board supports these file numbers:
• N10 -- Drive parameters (read and write)
• N11 -- Drive display data (read only)
• N12 -- Drive reference and feedback data (read and write)
• N20 -- Status of the most recent write parameter command (read only)
Figure 4.2 shows how the drive information maps to the drive information integer files.
4.3.3 Using the Drive Parameters Data (N10:x)
Beginning at N10:0, the PLC can read from and write to drive parameters. The drive
processes these parameters every 500 ms. From N10:1 - N10:06, there is a
one-to-one mapping with P.001 - P.006.
Figure 4.1 – Drive Information Map
N11:0
-
N11:172
N12:0
-
N12:31
N20:0
-
N20:273
N10:0
-
N10:273
Read/Write
Parameters
(500 ms
update )
Drive Display
Data
(100 ms update)
Reference and
Feedback Data
(FlexPak: 5 or 10 ms
update; WebPak:
10 ms update)
Write Status
(Read Only)
Unscheduled Traffic
Scheduled Traffic
File in
Drive
Option
Board
Drive
Information