ABB Module IMDSI22 ABB IMDS-I22 ABB IMDS I22 INPUT MODULE Ship to Worldwide

Product Description:

The measured value is calculated by subtraction. The value of the channel with the lower address is subtracted from the value of the channel with the higher address. The converted measured value is available on the odd address (e.g. EW 6,01). Important:The common mode input voltage range equals the measuring range of the single channel. I.e. that the signals, related to AGND, at the two involved inputs must not exceed this measuring range. Input voltages that exceed the measuring range cause
the overflow numerical value of +32767. If the measured value is below the range, the underflow numerical value of -32767 is set.

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The following figure shows the connection of a 3-wire sensor powered by 24 V DC and of a 2-pole sensor powered electrically isolated. Both sensors work as active current sources 0...20 mA.
It has to be taken into consideration, that in this application the M terminal of the basic unit 07 KT 94 is
the reference potential. AGND1 is not dimensioned for carrying the sum of the sensor currents.Differential inputs are very useful, if analog sensors are used which are remotely non-isolated (e.g. the minus terminal is remotely earthed). Since the earthing potential is not exactly the same as
AGND1, it has to be measured bipolar in order to compensate measuring errors. Additionally, in case of singlepole configuration, AGND1 would be connected directly to the remote earth potential. This would cause inadmissable (and possibly dangerous) earthing loops. In all configurations using differential inputs two adjacent analog inputs belong together (e.g. EW 6,00 and EW 6,01). For configuration, both inputs must be configured for the desired operating mode, see configuration table Fig.

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