Enable Full Scale
Set to 1 to enable a linear range from 0 to 65535 for specified input range. For a 4 to 20 mA input, a value of 0
represents 4 mA and 65535 represents 20 mA. Set this parameter to 0 to store input readings in unit-specific
data. For example, the register data representing a 15.53 mA reading is 15530. For units of current (0 to 20 mA
inputs), values are stored as µA (micro Amps) and voltage values are stored as mV (millivolts).
Enable Rising/Falling
Use these registers to enable the universal input logic to count on a rising transition or a falling transition. Write a
one (1) to enable; write a zero (0) to disable.
High/Low Register for Counter
The low and high registers for the counter hold the 32-bit counter value. To erase the counter, write zeroes to
both registers. To preset a counter value, write that value to the appropriate register.
Hysteresis and Threshold
Threshold and hysteresis work together to establish the ON and OFF points of an analog input. The threshold
defines a trigger point or reporting threshold (ON point) for a sensor input. Setting a threshold establishes an ON
point. Hysteresis defines how far below the threshold the analog input is required to be before the input is
considered OFF. A typical hysteresis value is 10% to 20% of the unit’s range.
Threshold
ON point
Time
Input V
alue
Input
Hysteresis
OFF point
In the example shown graphically, the input is considered on at
15 mA. To consider the input off at 13 mA, set the hysteresis to
2 mA. The input will be considered off when the value is 2 mA
less than the threshold.
Input Type
Program the universal inputs to accept input types NPN, PNP, 10k thermistor, 0 to 10 V, 0 to 20 mA, or
potentiometer. The default setting is 8: NPN raw fast. To set the input type, write the following values to the Input
Type Modbus registers.
0 = NPN
1 = PNP
2 = 0 to 20 mA
3 = 0 to 10 V dc
4 = 10k Thermistor
5 = Potentiometer Sense (DXM150 only)
6 = Not used
7 = Bridge
8 = NPN Raw Fast (default)
Temperature °C/°F
Set to 1 to represent temperature units in degrees Fahrenheit, and set to 0 (default) to represent temperature
units in degrees Celsius.
Modbus Configuration Registers for the Analog Output
The DXM100-B1 I/O base board has two analog outputs that are selectable as 0 to 20 mA (factory default) or 0 to 10 V. To
change the analog output characteristic, physical jumpers must be change on the I/O board and a parameter Modbus
register must be changed. For step by step instructions on changing the output characteristics see
on page 30.
Modbus Register
Analog Output
Description
4008
Analog Output 1
0 to 20 mA or 0 to 10 V dc output (I/O board jumper selectable)
Accuracy: 0.1% of full scale +0.01% per °C
Resolution: 12-bit
After changing the jumper position, write the appropriate value to the Modbus registers to define
your analog output to match the setting selected by the jumper.
2 = 0 to 20 mA output (default)
3 = 0 to 10 V output
4028
Analog Output 2
DXM100-Bx Wireless Controller Instruction Manual
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