ENGLISH 6/8
(1)
The threshold value depends on the type of RTD:
T
= 8 °C, T
= 9 °C, T
= 5 °C and T
= 5 ° C
PT100
PT500
PT1000
NI100
DIP-Switch settings
In the following tables:
The symbol
corresponds to DIP-Switch = 1 (ON).
Ç
No indication correspond to DIP-switch = 0 (OFF)
Ç
ON
1
Ç
OFF
0
È
DIP-Switch SW1
You must set the DIP-switches with the module powered down and without
generation of electrostatic discharges, otherwise the module may be damaged.
1 2 Baud rate
3 4 5
6
7
8 Address
9
Not Used
9600 Baud
Address and communications
parameters from EEPROM
Ç
Always leave to
OFF
È
È
position
Ç
19200 Baud
Ç
Fixed Address 01
È
Ç
Fixed Address 02
Ç Ç
Fixed Address 03
10
TERMINATION RS485
Ç
38400 Baud
Ç
Fixed Address 04
Ç
Line terminator
inserted
X
X
X
X
X
X
Fixed Address, as from binary
representation
Ç Ç
57600 Baud
È
No line termination
Ç Ç Ç Ç Ç Ç
Fixed Address 63
Filter Setting
The filtering methods can be set for every channel.
The filter consists of two independent low-pass filters:
-Filter FIR, in moving average, able to increase the noise rejection from the mains power line
and to reduce measuring noise.
-Filter IIR exponential, with programmable time constant, able to dampen fluctuations.
If an input variation is higher than threshold , then both filters are forced to quickly adapt to
T
the new value, stabilising it only later on. The filter is set with the three least significant bits of
registers MODBUS 40037..40 (refer to section
).
MODBUS REGISTERS
The following is a table containing all filter types. Propagation time (90%), that is the
maximum time between the step variation of the input and the variation of the number
which represents it in the Modbus register, including the interrogation time of an individual
register (at 115 kbaud) is indicated for each filter.
The times shown are for 50 Hz setting (for 60 Hz, you can divide by 1.2).
SET
ADC SAMPLING
FILTER
PROP. TIME 90%
Value
Bit ADC
Frequency
Type
< T
(1)
> T
(1)
000
13 bit
48 Hz
Not Present
45 ms
45ms
001
13 bit
20 Hz
Average
236 ms
103ms
010 (Default)
14 bit
11 Hz
Average
405 ms
179ms
011
14 bit
11 Hz
Media+Exp
1 s
179ms
100
14 bit
11 Hz
Media+Exp
3 s
179ms
101
14 bit
11 Hz
Media+Exp
8 s
179ms
110
14 bit
11 Hz
Media+Exp
24 s
179ms
111
14 bit
11 Hz
Media+Exp
72 s
179ms
MI00441
-3
-E
N
