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MIW-SPS-EN-001 - 29 / 11 / 2018
11 - 12
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■
Holding register 15
(40015) defines the minimum pressure limit. The default value
is the minimum of the set range. When the measured pressure is below this value,
input register 4 (“Min Pressure Limit Flag”) sets to
'
0
'
, otherwise it is
'
1
'
. This
register accepts values between -100 and 2.000. When a written value is out of
this range, the register returns to its default value. The minimum value cannot be
higher than the maximum value. Therefore, when a value higher than the maximum
value is written in this register, it automatically becomes equal to the maximum
value of the range.
■
Holding register 16
(40016) defines the “Power-Up Timer” value. The default
value is 60 s. During this time the minimum pressure limit is not compared with
the measured pressure values and “Min Pressure Limit Flag” register remains
'
0
'
for this period. You can change this register value only in the first 60 s after you
switch on the unit.
■
Holding register 17
(40017) is the “K-factor” register. You should enter the correct
K-factor of the used motor in it. The default value is
'
0
'
and the measured unit is
differential pressure, not air volume / flow rate
■
The registers 18—20
are not used. They are read only.
NOTE
Writing on these registers does not return Modbus error exception; however, it
does not change anything either!
MODBUS REGISTER MAPS
INPUT REGISTERS
Data type
Description
Data
Values
1
Differential
pressure
signed int.
Actual differential pressure
SPS-X-2K0
-100—2.000
1.000 =
1.000 Pa
unsigned int.
SPS-X-6K0
0—6.000
1.000 =
1.000 Pa
2
Output value
unsigned int. Actual output value: 0—100 %
0—1.000
100 =
10.0 %
3
Max. pressure
limit flag
unsigned int.
Flag indicates that the pressure is over
or below the max. limit
SPS-X-2K0
SPS-X-6K0
0 =
1 =
below the limit
over the limit
SPS-X-2K0
2 =
the value written in holding
register 14 is out of the
range: -100—2.000 Pa
4
Min. pressure
limit flag
unsigned int.
Flag indicates that the pressure is over
or below the min. limit
SPS-X-2K0
SPS-X-6K0
0 =
1 =
below the limit
over the limit
1.000 =
1.000 m
3
/h
SPS-X-2K0
2 =
the value written in holding
register 14 is out of the range
-100—2.000 Pa
5
Volume flow
rate
unsigned int.
Actual air volume flow rate in m
3
/h
SPS-X-2K0
0—44.000
Volume flow
rate high
Actual air volume flow rate in m
3
/h high
word
SPS-X-6K0
0—77.000
6
Reserved, returns 0
SPS-X-2K0
Volume flow
rate low
unsigned int.
Actual air volume flow rate in m
3
/h low
word
SPS-X-6K0
0–77.000
1.000 =
1.000 m
3
/h
7
Differential
pressure range
unsigned int.
Flag indicates the current differential
pressure range
SPS-X-2K0
SPS-X-6K0
2.000 =
2.000 Pa
0 =
1 =
2 =
3 =
4 =
5 =
6 =
7 =
0—100 Pa
0—250 Pa
0—500 Pa
0—750 Pa
0—1.000 Pa
0—2.000 Pa
-50—50 Pa
-100—100
Pa
0 =
1 =
2 =
3 =
4 =
5 =
6 =
7 =
0—1.000 Pa
0—1.500 Pa
0—2.000 Pa
0—2.500 Pa
0—3.000 Pa
0—4.000 Pa
0—5.000 Pa
0—6.000 Pa
8
Diff. pressure
response time
unsigned int.
Flag indicates the current response
time
0 =
1 =
2 =
3 =
0,5 s
1 s
2 s
5 s
9-10
Reserved, returns 0
SPS
DIFFERENTIAL PRESSURE
TRANSMITTER
