GE DS200TCQAG1BPR1 Speed module

Holding registers are analog values that are writeable to the 2301D-ST. These values can also be read by a device performing an error check. An example of an analog write value would be a direct speed setpoint as opposed to raise and lower commands. The values of the holding registers are also stored in the control as numbers representing engineering units (kPa or rpm). The 2301D-ST supports Modbus function codes 3, 6, and 16. These correspond to reading selected holding registers, writing to a single holding register and writing to multiple holding registers, respectively.

Modbus Scale Factors

These limitations can be overcome by scaling the value before it is sent across the Modbus. The default scale factor for the analog values is 1. The scale factor can be changed in the Watch Window (INTFC.COM) between 1 and 1000. These scaled parameters and their scale factor are available through the Modbus. Values that require a decimal point must be multiplied by the scale factor (10, 100 or 1000) prior to being sent across the Modbus. The value sent is then divided by the scale factor in the Master. The Scale Factor adjusts all associated analog reads accordingly. The Multiplier (sale factor) can be changed in the Watch Window.

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