Representation Of Analog Values; Overview - Siemens SIMATIC ET 200iSP Operating Instructions Manual

13.8

Representation of analog values

13.8.1

Overview

Electronic modules with analog inputs
The electronic module with analog inputs allows continuously variable signals, such as those
occurring in temperature measurement and pressure measurement, to be acquired, evaluated
and converted to digital values for further processing.
Electronic modules with analog outputs
With the electronic modules with analog outputs, digital values set by a controller can be
converted to a corresponding analog signal (current) in an analog output module and used to
control suitable actuators (setpoint input for speed controllers, temperature controllers and
similar).
Measured values in the case of a wire break depending on diagnostic being enabled
The rules and additions outlined below apply to the following measuring ranges:
● 4 to 20 mA
● Temperature sensor Pt100 standard and climatic, Ni100 standard and climatic
● Thermocouples types B, E, J, K, L, N, R, S, T, U
The following additions and rules apply:
Format of the analog values S7
Table 13-8 Measured values in the event of wire break dependent on enabled diagnostics (format S7)
Module Parameter assignment
4 AI I
● "Wire break" diagnostics
enabled
● "Wire break" diagnostics
disabled
● "Overflow/underflow"
diagnostics enabled
● "Wire break" diagnostics
disabled
● "Overflow/underflow"
diagnostics disabled
ET 200iSP
Operating Instructions, 11/2017, A5E00247483-07
32767
-32768
1
-
1
Measured values
decimal hexadecimal
7FFF
H
8000
H
-
Analog electronic modules
13.8 Representation of analog values
Explanation
● "Wire break" diagnostic message
● Measured value after leaving the
underrange
● "Low limit fallen below" diagnostic
message
● Measured value after leaving the
underrange
291