ABB Module 07DC91 ABB 07DC 91 ANALOG I/O UNIT Advant new version

ABB Module 07DC91 ABB 07DC 91 ANALOG I/O UNIT Advant new 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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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. The measured value is calculated by subtraction. The value of the channel with the lower address is subtracted

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