Siemens SIMATIC ET 200iSP, Руководство по эксплуатации

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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 Measured values Explanation
decimal hexadecimal
4 AI I
● "Wire break" diagnostics
enabled
32767 7FFF
H
● "Wire break" diagnostic message
● "Wire break" diagnostics
disabled
1
● "Overflow/underflow"
diagnostics enabled
-32768 8000
H
● Measured value after leaving the
underrange
● "Low limit fallen below" diagnostic
message
● "Wire break" diagnostics
disabled
1
● "Overflow/underflow"
diagnostics disabled
- -
● Measured value after leaving the
underrange
Analog electronic modules
13.8 Representation of analog values
ET 200iSP
Operating Instructions, 11/2017, A5E00247483-07
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