ABB Module System DSTA131 57120001AH CONNECTION UNIT DRIVE Highest Version

ABB Module DSTA131 57120001-AH ABB DSTA131 57120001AH CONNECTION UNIT DRIVE Highest version

Product Description:

Use of analog inputs as digital inputs Several (or all) analog inputs can be configured as digital inputs. When doing so, they evaluate input voltages higher than ca. +7 V as signal 1. The input impedance in this
operating mode is about 4 kW. Terminal M is the reference potential. The input signal delay is 7 ms. It cannot be configured. The inputs are not electrically isolated. they may be shorted to AGND. Unused inputs must be configured with "unused". The relationship between the analog input signals and the converted numbers is illustrated in the following figures. be made sure, that the high-speed counter is not configured to the operating modes 1 or 2 (see also the chapter "High-speed counter").Features of the analog inputs:The 8 analog inputs are not electrically isolated.The resolution of the A/D converter is 12 bits. Analog signals are conducted in shielded cables (seeThe analog inputs can be configured individually in a lot of different operating modes (even as digital inputs). The configuration is performed by setting certain bits in the system constants KW 86,00 to KW 86,07 as follows

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In order to avoid measurement errors, it is absolutely necessary, to lead the cores to the Pt100 sensors in the same cable. The cores must have the same cross section. Per channel, a twisted pair is used (for the two terminals of the Pt100 sensors) plus a single core (half of a twisted pair) for the connection to AGND1. Depending on the configured operating mode, the measured value is assigned linearly as follows the return wire AGND1. In the operating mode "Pt100 in 3-wire configuration" two adjacent analog inputs belong together (e.g. EW 6,00 and EW 6,01). For configuration, both inputs must be configured to the desired operating mode, see configuration table Fig. The constant current of the one channel flows through the Pt100 resistance sensor, the constant current of the other channel through one of the wires.
The basic unit 07 KT 94 calculates the measuring value from the two voltage drops and stores it under the odd address

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