Siemens 6DR2410, Manual

Page: 63 / 276

Manual 1 Technical Description
1.5 Functional Description
1.5.8 Complex Functions (Arithmetic blocks c, d, h)
SIPART DR24 6DR2410
C79000-G7476-C153-03
61
p
B
, T
B
Pressure and temperature of the calculation state of the measuring
panel (absolute values)
p
B
and T
B
must be within the ranges of the transmitters; and may not be more than the factor
100 away from the range limits.
PA, tA = 0.01 to 1
PE, tE = 1 to 99.99
The input C**.1
Δ
p

is limited to the values
≥
0.
If the adjustable ranges for PA, PE, tA, tE are not adequate, a linear equation can be switched
before the appropriate input for adaptation (function block LinE, see chapter 1.5.6, page 38).
Dead time element dti1, dti2
Lo
A
1.000
E1
E2
E3
td
ncon
td
X
.A
∩
c .F
--
n ---
dti1, dti2
(onPA) td
∩
.2
#
.3
∩
.1
The input function E1 is displayed at the output delayed by the time td (dead time 1 to 9984 s).
This time can be multiplied by a factor E2 and therefore changed externally.
The dead time element is implemented as a cyclic memory with 100 memory locations. The
spacing between the input and output time represents the dead time.
If td = oFF the input is connected through without time delay.
If td
≤
200 tc (tc cycle time), both pointers are moved cyclically, i.e. the cyclic memory is writ-
ten and read per cycle.
If td
>
200 tc the pointers are only moved every nth cycle, the cyclic memory is written and
read correspondingly less. To prevent „spot measurements”, the input value is averaged over
the input pointer movement.
The number of stored values is n =
td
tc n integer, rounded up or down and
≤
100.
If the digital input c**.3 is high, the dead time element is blocked, i.e the output holds its mo-
mentary value and further input data are not stored (reaction like halted conveyor belt). When
the digital input returns to low, the input data available before the blocking point are output. The
applied input values are stored again.