ABB 07AI91 GJR5251600R0202 Analog I/O Unit
Description:
All analog input modules perform an internal analog-digital conversion. After the conversion, the analog value is
represented with 8 or 12 bits, depending on the resolution. For processing and storing this relevant bits (bits which contain the analog information), a 16-bit word is available. All analog output modules perform an internal  digital-analog conversion. The digital value before the conversion (consisting of 8 or 12 relevant bits) is stored in a 16-bit word. 
As part of ABB Advant Controller 31 control system,07AI91 GJR5251600R0202 is used as a remote
module at the CS31 system bus. It has 8 analog input channels with the following features:
The channels can be configured in pairs for the connection of the following temperature or voltage
sensors:
• ± 10 V / ± 5 V / ± 500 mV / ± 50 mV
• 4...20 mA (with external 250 Ω resistor )
• Pt100 / Pt1000 with linearization
• Thermocouples types J, K and S with
linearization
• Only electrically isolated sensors may be used The range of ± 5 V can also be used for measuring 0..20 mA with an additional external 250 Ω resistor.
• The configuration of the input channels as well as the setting of the module address are performed with the DIL switches.
The 07 AI 91 uses one module address (group number) in the word input range. Each of the 8 channels use 16 bits.
The unit is powered with 24 V DC. The CS31 system bus connection is electrically isolated from the rest of the unit.
The module offers a number of diagnosis functions (see chapter "Diagnosis and displays"). The diagnosis functions
perform a self-calibration for all channels.
Technical data for the complete unit:
Permissible temperature range during operation     0...55 °C
Rated supply voltage     24 V DC
Max. current consumption     0.2 A
Max. power dissipation     5 W
Protection against reversed polarity of power connection     yes
Number of binary inputs     1 as enabling input for the analog outputs
Number of analog input channels     8 or 16, depending on the operating mode
Number of analog output channels     8 or 16, depending on the operating mode
Electrical isolation     CS31 system bus interface from the rest of the unit, 1 binary input from the rest of the unit
Address setting and configuration     Coding switch under the cover located on the right side of the housing
Operation and error displays     a total of 17 LEDs, see chapter "Diagnosis and displays"
Method of connections      removable screw-type terminal blocks
        supply terminals, CS31 system bus       max. 1 x 2.5 mm2 or max. 2 x 1.5 mm2
        all other terminals                                max. 1 x 1.5 mm2
Max. length of the analog cables, two-core shielded and cross section > 0.5 mm2     100 m
Conversion error of the analog values (non-linearity, factory calibration and resolution)     typ. 0.5 %, max. 1 %
Max. permissible potential difference between terminal M (minus of the supply voltage) and terminals AGND (minus of analog inputs and outputs)     ± 1 V
Common reference potential for all analog signals     AGND (minus terminal of analog inputs and outputs)
Electrical isolation of analog signals     none (see also Fig. 5.4-2).