Honeywell Minitrend QX, User Manual

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304 43-TV-25-30 Iss.6 GLO Aug 07 UK
Analogue Input Value
Analogue readings in engineering units. 4byte IEEE floats using 2 Modbus registers per
reading.
Communications Input
Values can be sent to the recorder for inclusion in the Maths Block, using command 16 up
to 32 IEEE floats can be sent to the recorder. Using CV1 to CV32 in the Maths Block, these
values can be displayed on the pens.
i.e. P1 = CV1 will set Pen 1 to the engineering value set address 1880 with the function code
16. Once again these are 4 byte IEEE floats using 2 Modbus registers per reading.
Pen Values
Pen values in engineering units, 4 byte IEEE floats using 2 Modbus registers per reading.
CV1
...
...
...
...
CV32
CV33
...
...
...
...
CV64
CV1 - 1880
...
...
...
CV32
ECV1 -2400
...
...
...
...
...
...
...
...
ECV - 96
Comms variable to be
used in Maths block
Modbus registers
So ECV1 @ 2400 is a different modbus
comms register but maps to exactly the
same place as CV1 @1880.
Both map to the comms variables CV1
Figure 22.1 Comms variables