GE IS200EXMDG1B Exciter MD feedback board

Description

GE General Electric Technical Specifications: IS200EXMDG1B

The number of 16-Channel Analog Current Input modules which may be installed in a system

depends on the amount of %AI and %I references available. Each module uses 1 to 16 %AI

references (depending on the number of channels enabled) IS200EXMDG1B and from 8 to 40 %I (depending on

alarm status configuration) references.

The available %AI references are: 64 in a Model 311, Model 313, and Model 323 system, 128

in a Model 331 system, 1024 in a Model 340 and 341 system, and 2048 in a Model 351 and

Model 352 system.

The maximum number of 16-Channel Analog Current Input modules which may be installed in a

system are:

4 in a Model 311, Model 313, and Model 323 system

8 in a Model 331 system

12 in a Model 340 and Model 341 system

51 in a Model 351 and Model 352 system

When planning the module configuration IS200EXMDG1B for your application you must also consider the load

capacity of the installed power supply and the total load requirements of all modules that are

installed in the baseplate.

Refer to the Series 90-30 Programmable Controller Installation Manual, GFK-0356 for details on

power supplies and module load requirements.

Since converters used in the analog modules are 12-bit converters, not all of the 16 bits in the data

tables contain data required for the conversion. A version of the 12 bits is placed within the 16-bit

data word corresponding to the analog IS200EXMDG1B point (in the %AI table). The Series 90-30 PLC system

handles the integration differently for the various analog modules.

The CPU does not manipulate the data from the input modules before placing it within the word

in the %AI data table. The bits in the %AI data table which were not used in the conversion by

the input module are forced to 0 (zero) by the analog input module. Placement of the 12 data

bits from the A/D converter for an analog current input data word for the 16-Channel Analog

Current Input module is shown below.

Analog values are scaled over the range IS200EXMDG1B of the converter. Factory calibration adjusts the analog

value per bit (resolution) to a multiple of full scale (that is, 4 µA/bit). This calibration leaves a

normal 12-bit converter with 4000 counts (normally 212 = 4096 counts). The data is then scaled

with the 4000 counts over the analog range. For example, the data to the A/D converter for the

16-Channel Analog Current Input is scaled as shown in the following figure.

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