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GE General Electric Technical Specifications: IS200ISBBG1AAB

For the IS200ISBBG1AAB Modbus implementation, these commands are used to read any setpoint (“holding registers”) or actual value

(“input registers”). Holding and input registers are 16-bit (two byte) values transmitted high order byte first. Thus all 469 set

points and actual values are sent as two bytes. The maximum of 125 registers can be read in one transmission. Function

codes 03 and 04 are configured to read setpoints or actual values interchangeably since some PLCs do not support both

function codes.

The slave response to these function codes is the slave address, function code, a count of the number of data bytes to fol

low, the data itself and the CRC. Each data item is sent as a two byte number with the high order byte sent first. The CRC

is sent as a two byte number with the low order byte sent first

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Some PLCs may not support execution of commands using function code 5 but do support storing multiple setpoints using

function code 16. To perform this operation using function code 16 (10H), a certain sequence of commands must be written

at the same time to the IS200ISBBG1AAB . The sequence consists of: Command Function register, Command operation register and

Command Data (if required). The Command Function register must be written with the value of 5 indicating an execute

operation is requested. The Command Operation register must then be written with a valid command operation number

from the list of commands shown in the memory map. The Command Data registers must be written with valid data if the

command operation requires data. The selected command will execute immediately upon receipt of a valid transmission.

When a IS200ISBBG1AAB detects an error other than a CRC error, a response will be sent to the master. The MSbit of the FUNCTION

CODE byte will be set to 1 (i.e. the function code sent from the slave will be equal to the function code sent from the master

plus 128). The following byte will be an exception code indicating the type of error that occurred.

Transmissions received from the master with CRC errors will be ignored by the IS200ISBBG1AAB .

The slave response to an error (other than CRC error) will be:

SLAVE ADDRESS: 1 byte
FUNCTION CODE: 1 byte (with MSbit set to 1)
EXCEPTION CODE: 1 byte
CRC: 2 bytes

The 489 implements the following exception response codes.

01: ILLEGAL FUNCTION

The function code transmitted is not one of the functions supported by the 489.

02: ILLEGAL DATA ADDRESS

The address referenced in the data field transmitted by the master is not an allowable address for the 489.

03: ILLEGAL DATA VALUE

The value referenced in the data field transmitted by the master is not within range for the selected data address.

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GE IS200ISBBG1AAB Turbine Control PCB board

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