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Parameter
Symbol
Configuration Parameters
(These parameters are part of Configuration level)
inP
Input Type
Type of signal that can be connected to the device input
unit
Unit
Temperature measurement unit
Point Position
Pnt
Display decimal point position
ILo
Input Low
Display value at low limit of the linear input range
IHi
Input High
Display value at high limit of the linear input range
Icor
Input Correction
Constant to be added to the measured input value
r
Addr
Address
Device address
bAud
Baud Rate
Serial interface rate
GrAd
Gradient
Maximum input signal change during the sampling period (120 ms)
\t
Filter Time
Relative time constant of the input filter
\b
Filter Band
Zone around the measured value, within which the filter is active
%[L
SP limit Low
Set-point Low limit
%[H
SP limit High
Set-point High limit
diR1
Direction 1
Control action direction of output K1
diR2
Direction 2
Control action direction of output K2
Parameters of the control algorithm
[e1
+ Differential 1
Positive Differential of output K1
me1
- Differential 1
Negative Differential of output K1
ym1
Time On 1
ON duration of output K1
y\1
Time Off 1
OFF duration of output K1
HLe1
Hold 1
Holds the output reaction of output K1
The same 5 parameters, but with index 2 - for output К2
Parameters of Basic (operating) level
%[1
Set Point 1
Set-point value of output K1
%[2
Set Point 2
Set-point value of output K2
Output Control
Description
(These parameters are part of Parametric level)
Control output operation
♦
The control outputs
operate according
to the control algorithm
parameters.
♦
The outputs deactivate
with the value change
of one of the following
configuration
parameters - Point
Position, Input Low, Input
High, and Input Correction
- and remain inactive till
Basic level is entered.
♦
The outputs deactivate
also when an error
has been detected
(see 'Error messaging').
ON/OFF control algorithm
The static characteristic
of a relay controlled
by an ON/OFF algorithm
is shown on the left drawing.
Output hold
For eliminating undesirable
switches of the relay output,
additional parameter (Hold)
is assigned to hold
the output reaction
for certain period of time.
Output pulse mode
When a relay is forced
to ON by the control
algorithm, it can either
stay ON or pulse
depending on Time On and
Time Off parameter values.
Setting any of these
parameters to '0'
disables the Pulse mode.
Input Filtration
10
Value
Unit
Pyh or Pyt
-
Ptx1 or Ptx2
-
R)1
-
yc-b
-
yc-J
-
yc-"
-
yc-r
-
yc-S
-
yc-t
-
u
-
I)20 or I$20
-
w)10
-
.Cor .F
-
x1, x0.1, x0.01, x0.001
-
-1999 ... 9999
ISU
-1999 ... 9999
ISU
1...254
-
!2, @4, $8, (6
bps
0 ... 9999
ISU
0 ... 9999
-
0 ... M
ISU
within input range
ISU
cooL, hEAt
-
These parameters are accessible in the presence of the corresponding relay.
0 ... 9999
ISU
0 ... 9999
ISU
0 ... 9999
sec.
0 ... 9999
sec.
These parameters are accessible in the presence of the corresponding relay.
within input range
ISU
Peak filter
This filter is intended for eliminating
pulse spikes (peaks), which can appear
in the input signal, in the following way:
♦
RT284U measures the input signal
value every 120 ms (sample time).
♦
The measured values are compared
subsequently. The filter checks
the difference between the last
two samples. If it does not exceed
Gradient value, the device accepts
the signal as normal.
♦
If the last measured value differs
from the previous one by more than
the Gradient value, the filter output is held
until the device determines a presence
of a normal signal. It is possible only
if the input signal has not been changed
with more than the Gradient value
for four subsequent samples.
♦
If the device has not determined
a normal signal for 20 subsequent
samples, noiS appears on the display
(see 'Basic level').
Low-pass filter
This first-order filter acts ONLY within
a certain band around filter output value.
This has been designed to cut periodic
noises outside the communication signal
spectrum.
♦
Filter operation is defined by two
parameters:
Filter Time (defines filter time constant) and
Filter Band (defines filter active band
around filter output value).
♦
If the newly measured value differs
from the filter output by more than
Filter Band, the filter resets
with a new initial output value
(newly measured value).
Notes
Pt100: -100...850 °C or Pt1000: -100...600 °C
PTC 1k or 2k: -50...150 °C
resistive linear: 0...1 k
T/C "B": 200...1800 °C
T/C "J": -20...1000 °C
T/C "K": -20...1300 °C
T/C "R": 0...1700 °C
T/C "S": 0...1700 °C
T/C "T": -40...400 °C
voltage linear: 0...100 mV
current linear: 0...20 mA or 4...20 mA
voltage linear: 0...10 V
°C or °F
when indicating values with the input-signal measurement unit (ISU)
These parameters make sense ONLY in case of a linear input signal!
OFFSET
1200, 2400, 4800 (factory-set), or 9600 bps
used for input peak filtration; Value '0' cancels the filtration.
This parameter and the following one define a low-pass input filter.
temperature: whole part of M ≤ 100; linear: M = 25% of input range
These parameters keep the Set point in safe limits,
preserving it from random changes.
('cooling' , 'heating')
lower than (High input range - Set Point 1)!
lower than (Set Point 1- Low input range)!
Value '0' disables Pulse mode.
11
Table 1
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