Siemens CP-8000, Руководство пользователя

Страница: 397 / 614

Engineering via SICAM WEB
SICAM A8000 / CP-8000 • CP-8021 • CP-8022 Manual Unrestricted
397
DC8-037-2.02, Edition 10.2017
9.1.11.5.4 Temperature Acquisition
For the acquisition of temperatures an an appropriate analog input module must be equipped,
and the AI signals to be used must be configured.
Connection of Resistance Thermometers
The connection of the resistance thermometers can be carried out in 2-, 3- or 4-wire technolo-
gy. With the 2-wire technology a calibration process is required. If no calibration process has
been carried out, the target device records a calibration error in the diagnosis.
You find the instruction for the calibration process in the manual SICAM RTUs Common Func-
tions Peripheral Elements According to IEC 60870-5-101/104, chapter "Temperatures", sec-
tion "Acquisition"
.
Direct Measurement
In the configuration of the contacts for the module you can select between Temperature and
Resistor .
With the resistance acquisition the preprocessing functions on the module (adaption, gradient
monitoring) are deactivated, in order to meet the process requirements concerning the re-
sponse time (for instance for the acquisition of transformer taps). The preprocessing functions
must be replicated in need in the open-/ closed-loop control function.
Note
The direct measurement is supported for the module AI-6310 as of revision "-A".
The differentiation between temperature acquisition and resistance acquisition (parameter
value_selection
) happens group by group for each value. To activate the direct measure-
ment, for the both values of a group a temperature acquisition must not be parameterized.
Group 0: IOM x – IN V0 and IOM x – IN V1
Group 1: IOM
x
– IN V2 and IOM
x
– IN V3
If for a group temperature acquisition and resistance acquisition is parameterized, the acquisi-
tion happens with all preprocessings (mean value creation and transient suppression).
With the temperature acquisition (i.e. Pt20) via a resistance acquisition, the mean value crea-
tion and transient monitoring must be replicated in the
open-/closed-loop control function
.