Flowserve 3400IQ Digital Positioner - Manual (Page 124)

Logix 3400IQ Digital Positioner FCD LGENIM3402-00 – 0/07
24
13. The valve will stroke to the beginning position, as defined by SIG_START ,and will begin ramping
to the desired ending position, as defined by SIG_STOP. Notice that SIG_COUNTER will incre-
ment while this takes place. (Typically- approx. 670 data sets will be collected with the above
settings and full stroke of the valve. Exact numbers will vary)
14. SIG_FLAGS indicates SIG COMPLETE.
15. Return the MODE_BLK to Auto
16. Notify control room the valve is back on-line. The stored signature will remain in the Logix
3400IQ digital positioner volatile RAM until the either the unit is powered down, or another
signature is taken which overwrites the previous one.
STEP SIGNATURE
If a step signature was desired, simply do not select STEP_RAMP in SIG_FLAGS, and then set the
STEP_TIME prior to selecting BEGIN_SIG.
Collection of Stored Signature
The collection of the stored signature is accomplished by the host system. It is not part of the device.
See host system programming.
A simple utility using National Instruments NIFBUS is available from Flowserve for retrieving a
signature file. This file is stored in a text format that can be imported into other programs for plotting
and analysis.
Contact Flowserve for more details.