Client Instrument Mapping
The following tables can be used as a reference for retrieving information such as the PV, setpoint, etc from a Client instrument. The Client instrument information will have a base offset based on the instrument number that is assigned. The base offset can be determined using the following formula:
Base Offset = (Instrument Number * 100) + 900
For example, the base offset for instrument 1 would be 1000 ® (1 * 100) + 900 – and the base offset for instrument 7 would be 1600 ® (7 * 100) +900. The Client instruments will be split into three sections: Atmosphere Instruments, Temperature Instruments, and Events Instruments. The layout for each instrument will be the same:
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Controller – The type of controller the Client instrument is – i.e. AC20, Series 9200, etc.
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Source Location – The register in the controller where the specified value is located. Note: These will be added on to the base offset of the instrument (see above section). For example, the source location for %C actual for an AC20 is 11. For instrument 1, the register to find the %C actual would be 1011 ® the base offset for instrument 1 is 1000, plus the source location of 11.
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Write Register – The register within the Client instrument where the value will be written.
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Read Scale – Any value read in from an instrument will be divided by this number for display purposes only.
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Write Scale – Any value written to an instrument will be multiplied by this number for display purposes only.
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Description – This will be a brief description of what the value is, i.e. %C actual, Setpoint, etc.