Rockwell Automation SP600 User Manual Version 3.0 - Manual (Page 25)

About the Drive 2-11
2.3.17 Network Data Transfer via Datalinks
A Datalink (see parameters 300 to 317) is one of the mechanisms
used by SP600 drives to transfer data to and from a programmable
controller via the optional network interface modules (e.g.
DeviceNet or ControlNet). In the case of ControlNet, Datalinks allow
a parameter value to be changed without using an Explicit Message
or Block Transfer.
Each Datalink (e.g. A1, A2 for Datalink A) transfers two 16-bit
values (A1, A2). If a 32-bit value needs to be transferred, each of
the two 16-bit Datalinks must be set to the same parameter. One
Datalink transfers the lower 16 bits; the other, the upper 16 bits.
For example, to set up the drive to receive accel and decel times
from the connected PLC you would make the following parameter
settings:
Data In A1 (300) = 140 (the parameter number of Accel Time 1)
Data In A2 (301) = 142 (the parameter number of Decel Time 1)
2.3.18 Programmable Parameter Access Levels and
Protection
The SP600 drive allows you to limit the number of parameters that
can be viewed on the LCD OIM using an Access Level password.
By limiting the parameter view to the most commonly adjusted set,
additional features that may make the drive seem more complicated
are hidden.
If you are trying to gain access to a particular parameter and the
OIM skips over it, you must change the parameter view from "Basic"
to "Advanced." This can be accomplished by reprogramming Param
Access Lvl (196) to "Advanced". See section 10.3.1 for instructions.
2.3.19 Process PI Loop
The internal process PI function (see parameters 124 to 138)
provides closed-loop process control with proportional and integral
control action. The PI function reads a process variable input to the
drive and compares it to a desired setpoint stored in the drive. The
algorithm will then adjust the output of the process PI regulator
thereby changing drive output frequency to try to make the process
variable equal the setpoint.
Refer to the descriptions of parameters 124 and 138 in chapter 11
for more information.