20
AI_TRANSDUCER Block Parameter List
2.8.2 RTD / Resistor specific parameters
Parameter
Rel.
Index
FF
Description
Type Store Size
byte
RO /
R/W Min. Max. Default
SENSOR_CONNECTION
35
Connection to sensor 1, select for 2-, 3- and 4-wire con-
nection. Ignored if sensor 1 is not a resistive sensor.
Defined codes:
0 = 2 wires
1 = 3 wires
2 = 4 wires
Un-
signed
8
SRC
1
R/W
1
COMP_WIRE1
36
Value in OHM to compensate line resistance when
Sensor 1 is a resistive sensor, connected with 2 wires.
Float
SRC
4
R/W
0
100
0
COMP_WIRE2
37
Value in OHM to compensate line resistance when
Sensor 2 is a resistive sensor, connected with 2 wires.
Float
SRC
4
R/W
0
100
0
SENSOR_CONNECTION_2
38
Connection to sensor 2, select for 2-, 3- and 4-wire con-
nection. Ignored if sensor 2 is not a resistive sensor.
Defined codes:
0 = 2 wires
1 = 3 wires
Un-
signed
8
SRC
1
R/W
0
CABLE_RES1
63
For 3- or 4-wire resistance measurements.
Indicates the measured cable resistance in the wire
connected to terminal 3. For 3-wire measurements it is
multiplied by 2
Float
D
4
RO
0,0
CABLE_RES2
64
For 4-wire resistance measurements.
Indicates the measured cable resistance in the wire con-
nected to terminal 6.
Float
D
4
RO
0,0
RTDX_FACTOR_1
65
Indicates the X factor for custom defined PtX, NiX, CuX
for LIN_TYPE
Un-
signed
16
SRC
2
R/W
100
RTDX_FACTOR_2
66
Indicates the X factor for custom defined PtX, NiX, CuX
for LIN_TYPE_2
Un-
signed
16
SRC
2
R/W
100
2.8.3 Thermocouple specific parameters
Parameter
Rel.
Index
FF
Description
Type Store Size
byte
RO /
R/W Min. Max. Default
RJ_TEMP
32
Reference junction temperature. The unit of RJ_TEMP is
the PRIMARY_VALUE_UNIT. If PRIMARY_VALUE_UNIT is
no temperature unit (e.g. mV) RJ_TEMP is stated in °C.
Float
D
4
RO
0
RJ_TYPE
33
Select reference junction from internal to fixed value.
Ignored for sensors which are not thermocouple types.
Defined codes:
0 = No reference: Compensation is not used (e.g. for
TC type B).
1 = Internal:
Reference junction temperature is
measured by the device itself, via
an internally mounted sensor.
2 = External:
The fixed value EXTERNAL_RJ_
VALUE is used for compensation.
The reference junction must be kept
at a constant temperature (e.g. by a
reference junction thermostat).
3 = Sensor, 2-w.: Reference junction temperature is
measured by external 2-wire con-
nected Pt100 sensor.
4 = Sensor, 3-w: Reference junction temperature is
measured by external 3-wire con-
nected Pt100 sensor.
Un-
signed
8
SRC
1
R/W
0
EXTERNAL_RJ_VALUE
34
Fixed temperature value of an external reference junc-
tion. The unit of EXTERNAL_RJ_VALUE is the PRIMARY_
VALUE_UNIT. If PRIMARY_VALUE_UNIT is no temperature
unit (e.g. mV) EXTERNAL_RJ_VALUE is stated in °C.
Float
SRC
4
R/W -40
(°C)
135
(°C)
0
RJ_COMP_WIRE
42
Value in OHM to compensate line resistance when
External RJ sensor, connected with 2 wires is used.
Float
SRC
4
R/W
0
100
0
