Function Blocks UM353-1B
April 2012
3-78
3.2.71 QHD_ - Quickset Hold
QHD_ function blocks enable a real value to be changed
on-line using the QUICKSET feature. The block is
identified by an 8-character name that will be displayed in
the QUICKSET mode. The block is configured with a
range entered as MIN SCALE and MAX SCALE to set a
usable range, and a Decimal Point Position parameter can
set the allowed precision. The hold value can not be
changed beyond the -10% to 110% value of these limits
and will change continuously as the pulser is turned. The
MAX value must always be set greater than the MIN value.
The block can also be forced to track input TV by asserting
input TC high (1).
QSCHANGE enables the block output to either update
continuously in the Quickset mode as the pulser knob is
turned or to only update the output with the value in the
numeric display when the STORE button is pressed.
When configuring the DPP (Decimal Point Position) it is important to keep the resolution to the minimum necessary
for operation changes. It will take the operator longer turning the pulser if the resolution is too high. For example,
if only 0.1% changes are needed, configure a 0-100 range as 0.0 – 100.0 and not 0.000 – 100.000.
During Hot or Warm start, the QHD will power-up in the last position during a Cold start at the -10% range value.
O1
Pulser
HOLD
Q
uick
S
et
NAME
TV
TC
T
rack
V
ariable
T
rack
C
ommand
O
utput
1
ENG
ineering
UNITS
MIN
imum
SCALE
MAX
imum
SCALE
.
.
Rev. 2
QUICKSET HOLD
O1
O
utput
1
QUICKSET HOLD
QHD_
ESN =
000
E
S
Q
Q
uick
S
et
NAME
(S)
........... 8 ASCII Char (null)
MAN
T
rack
V
ariable
TV
T
rack
C
ommand
TC
MIN
imum
SCALE
(H)
...................... Real (0.00)
MIN
S
C
ALE
ELA
C
SMAX
MAX
imum
SCALE
(H)
..................... Real (100.00)
ENGUN I TS
DPP
D
ecimal
P
oint
P
osition (preferred)
(S)
... 0.0.0.0.0.0 (0.00)
OR
O
utput
R
ange
ESN
E
xec.
S
eq.
N
o.
(H)
................. 001 to 250
I
I
N
N
P
P
U
U
T
T
V
C
INPUT TC
(H)
.........
loop tag.block tag.output
(null)
INPUT TV
(H)
.........
loop tag.block tag.output
(null)
T
T
ENG
ineering
UNITS
(S)
..... 6 ASCII Char (PRCT)
Q
uick
S
et
CHANGE
...
C
ontinuous/
S
tore (C)
Q
S
C
HANGE
PU VAL
U
E
P
ower
U
p
VALUE
(S)
......................Real (0.00)
P
ower
U
p
LAST
(S)
....................No/Yes (YES)
PU
LA
S
T
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