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Analog Value Processing
Connecting Resistance Thermometers (PT 100) to a 465-7LA13 Analog Module
PT 100
+
¯ ¯ ¯
Channel 0
0...500 mV
Channel 3
U/I
U
CM
U
CM
I
(2.5 mA)
const.
Figure 10-14. Connecting Resistance Thermometers (PT 100s) to a 465 Analog Input Module
10-22
Range card 1
M+
M –
Range card
6ES5 498-
-1AA11
for 4 inputs
Range card 2
6ES5 498-
Channel 4
-1AA11
-1AA21
-1AA31
-1AA41
-1AA51
-1AA61
Channel 7
-1AA71
Range card 3
S+
S –
Range card
6ES5 498-
-1AA11
for 4 inputs
Range card 4
Range card
6ES5 498-
-1AA11
S5-115U Manual
A constant-current generator sup-
plies the relevant resistance ther-
mometer with a current of 2.5 mA
over pins "S+" and "S -" via a
range card (6ES5 498-1AA11) (see
Figure 10-14).
The voltage on the PT 100 is picked
off over inputs "M+" and "M -".
Other potential-free voltage sensors
(500 mV voltage range) can be con-
nected to those inputs (M+/M -)
not used for resistance thermo-
meters.
If no PT 100 is connected over input
channels 4 to 7, other voltages and
currents can be measured over these
channels
using
a
-1AA31, -1AA41, -1AA51, -1AA61 or
-1AA71 range card (see Figure 10-14
range card 2). In this case, you must
short-circuit
the
current
(S+, S-) belonging to the relevant
card with a jumper. Should you fail
to do so, the error bit would be set
for the relevant channel and the
value "0" decoded (see Figure 10-14
range card 4).
If you use a -1AA21, -1AA31 or
-1AA61 range card for a channel
group, no wirebreak signal may be
enabled for that channel group.
A
correction
of
100
(100 ohms=0°C) must be made via
the control program by specifying
the appropriate upper and lower
limiting
values
in
FB250
Section 10-9).
EWA 4NEB 811 6130-02b
498-1AA21,
outputs
ohms
(see
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