AI_TRANSDUCER Block (PA Slot 3) Parameter List
2.8.2 RTD / Resistor specific parameters
Parameter
Rel.
Index
PA
Description Type Store
Size
byte
RO /
R/W
Min. Max. Default
SENSOR_CONNECTION
36
Connection to sensor 1, select for 2-, 3- and 4-wire
connection. 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
37
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
38
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
62
Connection to sensor 2, select for 2-, 3- and 4-wire
connection. 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
87
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
88
For 4-wire resistance measurements.
Indicates the measured cable resistance in the wire
connected to terminal 6.
Float D 4 RO 0,0
RTDX_FACTOR_1
89
Indicates the X factor for custom defined PtX, NiX, CuX
for LIN_TYPE
Un-
signed
16
SRC 2 R/W 100
RTDX_FACTOR_2
90
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
PA
Description Type Store
Size
byte
RO /
R/W
Min. Max. Default
Rj_TEMP
33
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
34
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
35
Fixed temperature value of an external reference
junction. 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
66
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
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