Rockwell Automation 1746-QV,D17466.18 OPEN-LOOP VELOCITY CONTL - Manual (Page 13)

3–3 Setting Up the Software
Publication 1746-6.18 April 1998
5. Enter values in the G file:
If the module was listed: If the module was not listed (you entered the ID):
You get the G–file Setup screen.
Enter data from the table, below. You get the following display, shown in decimal radix.
Enter a value in each word as shown, next.
G–file display for unlisted module (shown in decimal radix):
Ge:0 2056 0 0 0 0 0 0
Enter a value at each G-file word address and press [ENTER] .
Then cursor to the next word address and repeat. For example:
Ge:0 2056 893 730 12 1200 –32768 0
We used values from the ladder logic example (appendix B).
You will want to use G-file values that suit your application:
Word: Function of G-file Word: Range: Description of G-file Word or Bit: Example:
0 Reserved. Do NOT use. n/a The processor stores a code for the 1746-QV module. 2056
words 1 & 2 refer to the gradient or transducer calibration value stamped on the name plate on the transducer housing.
1 LDT calibration: upper 3 digits 800-999 ms/inch For example: To enter an LDT calibration of 8.9373,
u e deci al radi and enter 893 in word 1 and 73 in word 2. 893
2 LDT calibration: lower 3 digits 000-999 ms/inch
For e a ple o enter an calibration of 8.9373
use decimal radix and enter 893 in word 1 and 730 in word 2.
730
3 Full-scale length (L) of LDT 2 vLv160 inch Enter the length of the LDT (160 inches max). 12
4 Full-scale count (C) 2
vCvLx100
Typically C = L x 100.
Position Data (I:e.1) = C/(L x 100)
LDT Calibration
1200
5 Configuration Bits bits 0-12 Set to zero. –32,768
bit 1 = 1
Configuration Bit
15 14 13 12-0 Equivalent Value
0 1 0 0
+16,384
1 0 0 0 –32,768
1 1 0 0 –16,384
bit 13 0 = output maintained during LDT fault while running profiles and
during SLC mode change
1 = output resets for LDT fault and SLC mode change
–32,768
(bit 15 = 1
for position
increases
towards
head
1 1 0 0 –16,384
0 1 1 0 +24,576 bit 14 Type of LDT: 0 for RPM, 1 for DPM
towards
LDT head)
bit 15 0 = position data increases when moving away from LDT head
1 = position increases when moving toward LDT head
6 Preset Reference –32,768 to +32,767 Typically zero or home reference value. 32,767 = 327.67 inches. 0
Examples of Full-scale Count Values
LDT Physical
Length No. of
Recirculations
Resolution
Full-scale
Length (L) Full-scale
Counts (C)
from 160” to 2” 1 0.01 L (160” to 2”) L x 100
16” 2 0.01 160 8000
16” 4 0.01 160 4000
16” 10 0.001 160 16000
Important: The module checks for invalid data such as out of
range values or the setting of reserved bits 0-12. You can clear a
data-entry configuration error only by re-entering a corrected value.
6. Save when done .
Click OK. Click OK. Close window.