Description
GE General Electric Technical Specifications: IS200EXHSG4AEC
Since converters used in the analog modules are 13-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 point (in %AQ or %AI tables). The Series 90-30 system
handles the integration differently for the IS200EXHSG4AEC various analog modules.
The Series 90-30 system disregards the data placed in the extra bits in the %AQ table and uses
those bits for communications with the module. The CPU also converts the data in the %AQ data
word from 2’s complement to sign magnitude format before sending the data to the output module.
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. An example of the bit placement
for an analog current output data word is shown below. This example is for the Analog Current
output module, catalog number IS200EXHSG4AEC.
brand | Product Name | Product model | Order No |
GE Fanuc | Module card | IS200EXHSG4AEC | nothing |
Place of Origin | Marketable land | Imported or not | defects liability period |
Europe and America | Nationwide and overseas | yes | a year |
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Xiamen | Shunfeng Express | Commissioning and installation | Power Plant Steel Plant Cement Plant Shipboard Papermaking |
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Product features | Primary source of goods, supply by model | After sales guarantee | Chen 1810693-7731 |
Because the converted bits (12 bits) in the data word (16 bits) are not right-justified, the
placement of the converted bits causes the output, or input, to be a stair step. The net effect of
the stair step for an output module IS200EXHSG4AEC is that not every increase in the %AQ data table will cause
an increase in the output. The net effect for an input module is that an increased input will not
cause the LSB (Least Significant Bit) of the data word in the %AI table to change. The size of
the step depends on the range of the analog signal, the resolution of the conversion, and the
number of LSBs disregarded. These factors can be used to calculate the size of the step. For
example, the analog output module provides outputs from 4 to 20 mA in 12 bits. Therefore,
each bit represents (20-4 mA)/212 bits = 3.906 µA/bit. However, factory calibration adjusts for
an even number of microamps per bit (4 µA/bit). Since the three LSBs in the %AQ output are
not used in the conversion, an 8 count (2 3 ) increase in the %AQ output is needed to change the
analog output by 4 µA. The software rounding algorithm causes the step to rotate between a
count of 7 and a count of 9 instead of 8. The values supplied in Table 3-3 provide you with the
information needed to calculate step sizes.
The following figure shows a portion of the analog current output versus the corresponding data
word in %AQ.
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