GE IS200EXHSG4A gas turbine system

Description

GE General Electric Technical Specifications: IS200EXHSG4A

The analog inputs are differential; that is, the converted IS200EXHSG4Adata is the difference between the

voltages IN+ and IN– as shown in Figure 3-2. The differential input configuration is much less

sensitive to noise and ground currents. Both inputs are referenced to a common voltage,

referred to as COM. The average voltage of the IN terminals with respect to COM is referred

to as Common Mode Voltage. Different signal sources may have different common mode

voltages, shown as V (CM1) and V (CM2). This common mode voltage may be caused by

differences in location of circuit grounds, or by the nature of the input signal itself.

To reference floating sources and limit common IS200EXHSG4A mode voltages, the COM terminal should be

connected to either side of the input at the source itself. Without special design considerations,

the summation of the common mode voltage, the differential input voltage and noise on the

lines referenced to the COM terminals is limited to ±11 volts, or damage may result to the

module. The input modules provide some filtering to protect against high frequency spikes, but

low frequency signals exceeding this will produce erroneous conversions.

The IS200EXHSG4A %AQ data table is a memory location within the Series 90-30 CPU where the output

information is stored. Both current and voltage analog output modules are available for the Series

90-30 PLC; however, the Series 90-30 CPU does not recognize the difference between the two

types of analog outputs. The user must configure the Series 90-30 PLC system as described in the

Series 90-30 Programmable Controller Installation Manual, GFK-0356 and the Logicmaster 90

Series 90-30/20/Micro Programming Software User

s Manual

, GFK-0466. After configuration, the

two analog outputs will correspond to 32 bits in the data table.

The Series 90-30 PLC uses the data within the %AQ and %AI data tables to drive or record

analog values as shown in Figures 3-1 and 3-3. The analog data is handled in a 2’s

complement format. Two’s complement, for conversion purposes, consists of a binary code for

positive magnitudes (represented by a 0 (zero) in the most significant bit), and the 2’s

complement of each positive number to represent its negative. To convert negative numbers

from 2’s complement to binary, invert each bit and add one. The operation below is an example

conversion of a 16-bit word.

Working in decimal format, instead of hexadecimal, within the data tables will allow easier

calculations when you are working with analog data. You can use the data in the %AQ and

%AI data tables for any math or data function without having to do any conversion or 2’s

complement math. When using raw data in any math calculations, you would usually use

double precision math.

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