Siemens SIMATIC S7-1500 Manual page 23

Measurement type
Thermal resistor RTD
(3-wire connection)
(4-wire connection)
Thermocouple (TC)
Disabled
The tables of the input ranges, overflow, underrange, etc. are available in the appendix
Representation of analog values (Page 64).
Using PTC resistors
PTC resistors are suitable for temperature monitoring of electrical devices, such as motors,
drives, and transformers.
Use Type A PTC resistors (PTC thermistor) in accordance with DIN/VDE 0660, part 302. In
doing so, follow these steps:
1. Choose "Resistor (2-wire terminal)" and "PTC" in STEP 7.
2. Connect the PTC using 2-wire connection technology.
If you enable the "Underflow" diagnostics in STEP 7, it will be signaled for resistance values
<18 Ω. In this case, this diagnostic signifies "Short-circuit in the wiring".
The following figure shows the address space assignment for the AI 8xU/I/RTD/TC ST
module with PTC resistors.
Figure 4-1
Analog input module AI 8xU/I/RTD/TC ST (6ES7531-7KF00-0AB0)
Manual, 09/2016, A5E03484864-AD
Measuring range
PT100 Standard/Climate
PT200 Standard/Climate
PT500 Standard/Climate
PT1000 Standard/Climate
Ni100 Standard/Climate
Ni1000 Standard/Climate
LG-Ni1000 Standard/Climatic
Type B
Type E
Type J
Type K
Type N
Type R
Type S
Type T
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Address space for the AI 8xU/I/RTD/TC ST module with PTC resistors
Parameters/address space
4.1 Measuring types and ranges
Representation of analog values
See Representation of analog values
for thermocouples (Page 71)
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