Rockwell Automation 1746-QV,D17466.18 OPEN-LOOP VELOCITY CONTL - Manual (Page 32)

SLC Processor Files C–2
Publication 1746-6.18 April 1998
Use this file (Ge:0) to configure the module for use with the LDT.
Example values are those from the sample ladder logic (appendix B).
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
1 14 13 12- Equi alent Value
bits 0-12 Set to zero. –32,768
bit 1 = 1 15 14 13 12-0 Equivalent Value
0 1 0 0
+16,384
1 0 0 0 –32,768
1 1 –16 384
bit 13 0 = output maintained during LDT fault or SLC mode change
1 = output resets for LDT fault or SLC mode change
(bit 15 = 1
for position
increases
toward
1 0 0 0 –32,768
1 1 0 0 –16,384
0 1 1 0 +24,576
bit 14 Type of LDT: 0 for RPM, 1 for DPM
increa e
towards
LDT head)
0 1 1 0 +24,576
bit 15 0 = position data increases when moving away from LDT head
1 = position increases when moving toward LDT head
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
The ladder program loads commands and profile data into the
module through the output image table, O:e.0–O:e.7.
Word: Function of Output Image Word: Bit #: Description: (For command bits, a 0-to-1 transition enables the command)
0 Command Bits 0 Set to run an extend profile. Co and Bit
Enable the e bit
1 Set to run a retract profile.
Enable these bits
with our ladder logic.
2 Set to disable the profile. This bit over-rides bit 0 or 1.
with your ladder logic.
3 Set to change current position data to the value of preset reference in Ge:6.
4 Set to clear any data-entry errors.
5 Set to define words 1-7 as programmed position setpoints for extend.
6 Set to define words 1-7 as programmed voltage values for extend.
7 Set to define words 1-7 as programmed position setpoints for retract.
8 Set to define words 1-7 as programmed voltage values for retract.
9-15 Reserved. Do NOT use.
1-7 Position 1-7 Setpoint or Voltage
(i.e. word 2 = position 2, etc.) n/a Important:
Enter position setpoints in units of 0.01” (200 = 2.00”) within the range of
–327.68 to +327.67”, and voltage values in 5mV units (3005 = 3.005V)
within the range of
"10,000mV.
G File
Output Image Table