Rockwell Automation 1336T PLC Comm. Adapter, Series B, FRN 2.xx-3.xx User Manual
Page 38
2–10
Publication 1336 FORCE–5.13 –– September, 1998
Use the set up parameters to program the PLC Communications
Adapter Board functions. The following parameters are used for set
up:
Parameter
number:
Parameter
name:
These parameters determine
the:
392, 394,
396, 398
Analog Input
Offset
Offset applied to the raw Analog
Input values before the scale
factor is applied.
393, 395,
397, 399
Analog Input
Scale
Scale factor or gain for Analog
Input values.
400, 402,
404, 406
Analog Output
Offset
Offset applied to the Analog
Output values after the scale
factor is applied.
401, 40
3,
405, 407
Analog Output
Scale
Scale factor or gain for Analog
Input values.
Configuration parameters allow the PLC Communications Adapter
Board to communicate with the drive. You need to link the
configuration parameters to parameters in the drive. The following
are the analog input and output configuration parameters:
Parameter
number:
Parameter
name:
These parameters are the:
339 – 342
Analog Input
Source parameters that are the
result of converting a +10V signal
to a +32767 value using the
associated scale and offset
parameters.
387 – 390
Analog Output
Sink parameters used to convert
+32767 values to a +10V signal.
Each analog input and output is associated with a scaling and offset
set up parameter. You must adjust these parameters for each analog
device.
The drive works with internal drive units. Each parameter is a 16–bit
word that allows a range of
±
32767 internal units. The drive is scaled
so that 4096 is equal to one unit or 100% of the quantity being
regulated. A
±
10V
dc signal applied to an analog input is converted
to a digital value of
±
2048, providing a total range of 4096. When
calibrating analog inputs, a scale factor is applied to this value to
provide an effective range of
±
32767 (16
×
2048). The offset
parameter determines the offset in volts, applied to the raw analog
value before the scale factor is applied. This allows you to shift the
range of the analog input by
±
4096 drive units (
±
20 volts).