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SECTION
9.
INPUT/OUTPUT INSTRUCTIONS
TABLE 9-3. Thermocouple Type Codes
Code
X1
x2
X3
x4
Thermocouple
Tvpe
T
(copper
-
constantan)
E (chromel
-
constantan)
K
(chromel-
alumel)
J (iron
-
constantan)
Normal Measurement
TC input from A5B40 isolation
(use
5
V range)
X
=
9
Output
-99999
if
out of
common mode
(lnst.
14
only)
X=0
X=8
TABLE
9-4i
Voltage and Temperature Ranges for Thermocouples if Reference Junction is
20oC
Voltdge
Range
Temperature Range
oC
Type
T
Type
E
Type
K
Type
J
t5
t15
t50
t500
ilnV
inV
dnV
-122
-270
-270
-270
141
386
1254
1372
-131
to
-270
to
-270
to
113
294
760
to
to
to
to
-70
to
98
-270
to
237
-270
to
676
-270
to
1000
131
316
400
-84
to
-210
to
-210
to
combined
differential
V
***
14
THERMOCOUPLE TEMPERATURE, ***
DIFFERENTIAL MEASUREMENT
FUNCTION
This instructbn calculates the thermocouple
temperature
[or the thermocouple type selected.
ibn
specifies a DIFFERENTIAL
VOLTAGE
REMENT
(Section 13.2) on
the
adds
the measured voltage to
the voltage
lated for
the reference
temperaturelrelative to
OoC,
and converts
the
Input locations
altered:
1
for each
thermocouple channel
***
16
TEMPERATURE
FROM
***
PLATINUM R.T.D.
FUNCTION
This instruction uses the result of a previous
RTD bridge measurement
to calculate the
temperature according to
the DIN 43760
specification
adjusted (1980) to conform to the
pending International Electrotechnical
Commission
standard. The polynomial
range
is
-200oC to
850oC. The error is less than
0.001oC between
-100 and +300oC,
and is less than 0.003oC
between -180oC and
+830oC. The error
(T
calculated
-
T
standard) is +0.006oC at -200oC
and -0.006oC at
+850oC. The input must
be
the
ratio Rr/Rs,
where
R.
is
the RTD resistance and
Rs
the resistance of the RTD at
OoC
(Sections
7.9 and 7.10).
PARAM.
DATA
NUMBER
TYPE
DESCRIPTION
Repetitions
Input location
of Rs/Ro
Input location of result
Multiplier
Otfset
to
temperature in
oC. The
are briefly shorted
to ground
prior to
the
voltage measurement to
insure that
tltev are within the common mode
range.
Tablf
9-3 gives the thermocouple type
codes
for
4.
Select
the smallest
voltage
rangle
that will accommodate
the
temperaturet being measured (Table 9-4).
PARAM.
DATA
NUMBER
TYPE
DESCRIPTION
Repetitions
Range
code
First TC channel
Thermocouple type code
Reference
temperature
location
Destination input location
Multiplier
Otfset
01:
02:
03;
o4:
05:
06:
07:
08:
2
2
2
2
4
2
4
4
FP
FP
01:
02:
03:
04:
05:
4
FP
FP
Input locations
altered:
1
for each RTD
9-7
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