GE IC660CBB902K Industrial Control System

Product Specification

Product Details
The 4-Channel Analog Current Input module for the Series 90-30

Programmable Logic Controller provides four input channels, each capable

of converting an analog input signal to a digital signal for use as required by

your application. This module provides two input ranges.The default range

is 4 to 20 mA with user data scaled so that 4 mA corresponds to a count of 0
and 20 mA corresponds to a count of 32000 with each 1000 counts

representing 0.5 mA. When a jumper is added to the I/O terminal board,

the input range is changed to 0 to 20 mA with user data scaled so that 0mA

corresponds to a count of 0 and 20 mA corresponds to a count of 32000 with

each 800 counts representing 0.5 mA. Two range jumpers are provided with

the module; one for channels one and two, and the other for channels three

and four.
Conversion speed for each of the four channels is one-half millisecond. This

provides an update rate of two milliseconds for any channel. Resolution of the

converted signal is 12 bits binary (1 part in 4096) over either range. User data

in the %AI registers is in 16-bit 2’s complement format. The placement of the

12 bits from the A/D converter in the %AI data word is shown below. The

relationship between the current input and the data from the A/D converter is

shown in Figures 3-14 and 3-15.
 

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