Siemens SIMATIC S5-115F, User Manual

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Analog Value Processing S5-115F Manual
Connecting resistance thermometers (e.g. PT 100)
In the case of 6ES5 460-7LA11and 6ES5 460 -7LA12:
A constant-current generator supplies series-connected resistance thermometers (maximum
8 x PT 100) with a current of 2.5 mA via pins ”S+” and ”S-”.
If no PT 100 is connected to input channels 4 to 7, other voltages and currents can be measured at
these channels with the range cards 498 1AA21, -1AA31, -1AA41, -1AA51, -1AA61 or -1AA71
( Figure 6-4, card 2).
You need not connect short-circuit jumpers to the unused channels if you are using range cards
498-1AA41, -1AA51 or -1AA71. If you are using other range cards, you must connect short-circuit
jumpers to the unused input channels ( Figure 6-4, channels 5 and 6).
Figure 6-4. Connecting Resistance Thermometers to the 460 Analog Input Module
Chann. 4
Channel 3
Reference bus
Module 1
Module 2
I
const
2.5 mA
S+
S –
Channel 7
M+
M –
¯ ¯ ¯
0 to 500 mV
0 to 500 mV
Range card
for 4 inputs
6ES5 498-
1AA11
Channel 0
Channel 1
Channel 2
+
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V
CM
V
CM
I –
I+
PT 100
PT 100
PT 100
PT 100
460 AI module
6-6
EWA 4NEB 811 6148-02