Weidmuller WI-GTWY-9 User Manual page 67

WI-GTWY-9-xxx Wireless Gateway
Scaling is configured in the "Sensitivities" section of the configuration software. If you select a
new sensitivity/scaling block, you can select/deselect sensitivity or scaling or both. There is no
relationship between sensitivity and scaling -
we use the same configuration area as it is
convenient because both features use blocks of
I/O registers.
In the first example, a block of I/O registers is
configured for both sensitivity and scaling. I/O
block 0 to 79 (total of 80 registers) is
configured with a sensitivity value of 500. The
same block has scaling configured converting
the range 16384-49152 on the radio side to 0-
4095 on the data bus side.
This is an example of converting a 4-20mA
value to a "Honeywell 12-bit value". Note that
the scaling works in both directions - for
values being read from the I/O registers to the
data bus, and values written from the data bus
to the I/O registers.
Any values outside of the scaling range are set
to the minimum or maximum value. For
example, if the data bus read a value of 10,000 from a register in this block, as it is less than the
minimum range on the radio side (the min. is 16,384) it will be transferred as 0 which is the
minimum value on the data bus side. If a value of 65,535 is read from another register, then as it
is more than the maximum value on the radio side (max. value is 49,152), then the value is
transferred as 4095 which is the maximum on the data bus side. This works in both directions -
if the data bus tries to write a value of 10,000 to an I/O register in this block, it will be written as
value 49,152 (which is the max. value on the radio side.
Data-bus
Transferring values from
Value
Radio I/O Reg. to Data Bus
4095
0
0 16384
Radio I/O Reg. Value
Radio
I/O Reg.
Value
49152
16384
49152 65535
Transferring values from
Data Bus to Radio I/O Reg.
0
0 4095
Data-bus Value
V1.18
If both
Sensitivity
and Scaling is
required,
either function
can be
67