Qhd_ - Quickset Hold - Siemens 353 User Manual

Function Blocks

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).
TV
Track Variable
TC
.
Track Command
QuickSet NAME
MINimum SCALE
MAXimum SCALE
ENGineering UNITS
BLOCK DIAGRAM
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.
3-78
Pulser
O1
HOLD
Output 1
QUICKSET HOLD
TV
Track Variable
Track Command TC
S
Q N A M E
M I N S C A L E
C
M A X S A L E
D P P
E N G U N I T S
Q S C H A N G E
P U V A L U E
P U L A S T
I N P U T T V
T C
I N P U T
E S N
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.
UM353-1B
ESN = 000
QHD_
OR
Output Range
QUICKSET HOLD
O1
Output 1
........... 8 ASCII Char (null)
QuickSet NAME
(S)
MINimum SCALE ...................... Real (0.00)
(H)
MAXimum SCALE ..................... Real (100.00)
(H)
D P P
ecimal oint osition (preferred) (S) ... 0.0.0.0.0.0
ENGineering UNITS ..... 6 ASCII Char (PRCT)
(S)
Quick Set CHANGE ... Continuous/Store
Power Up VALUE ......................Real (0.00)
(S)
Power Up LAST ....................No/Yes (YES)
(S)
INPUT TV .........
loop tag.block tag.output
(H)
INPUT TC ......... loop tag.block tag.output
(H)
Exec. Seq. No. ................. 001 to 250
(H)
April 2012
(0.00)
(C)
(null)
(null)
Rev. 2