Default Output State. The Default Output State parameter represents the default condition of the analog output. When an
error condition exists, the outputs are set to this 16-bit user-defined output state. To define the error conditions for device
outputs, refer to the MultiHop default output parameters 2950-2954.
Enable Register Full Scale. Set to 1 to enable a linear range from 0 to 65535 for specified input range. For a 4 to 20 mA
output, a value of 0 represents 4 mA and 65535 represents 20 mA. Set this parameter to 0 to store 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 outputs),
values are stored as µA (micro Amps) and voltage values are stored as mV (millivolts).
Hold Last State Enable. Set the Hold Last State to 1 to set the output to its last known value before the error occurred. Set
this parameter to 0 to disable the Hold Last State and use the Default Output State setting during an error condition.
Maximum Analog Value. The Maximum Analog Value register stores the maximum allowed analog value. The specific units
of measure apply to the register value. For example, the register may contain 20000, for 20 mA, or for a voltage output the
register may contain 8000, for 8 volts.
Minimum Analog Value. The Minimum Analog Value register stores the minimum allowed analog value. The specific units of
measure apply to register value. For example, the register may contain 4000, for 4 mA, or for a voltage output the register
may contain 2000, for 2 volts.
5.5.4 Isolated Discrete Inputs
Pin
Input
Description
Pin 14
Input 1A
Optically isolated AC input type, 0 to 12 to 30 V dc
Input to output isolation of 2.5 kV
IN xA
IN xB
Pin 15
Input 1B
Pin 16
Input 2A
Pin 17
Input 2B
Synchronous Counters. An isolated input can be programmed to count the input signal transitions. When an input is
enabled as a counter, the counter value is stored into two 16-bit Modbus registers for a total count of 32-bits (unsigned). To
program an input to capture the edge transition counts, follow
Example: Configure Input 1 as a Synchronous Counter
on
page 18.
The counters are synchronous because the inputs are sampled at a 10 ms clock rate. The input logic does not detect rising
or falling edges, it samples the input every 10 ms to find level changes. The input signals must be high or low for more than
10 ms or the input will not detect transitions. Because most signals are not perfect, a realistic limit for the synchronous
counter would be 30 to 40 Hz.
Universal inputs can also be configured as a synchronous counter. See the Modbus register map for universal inputs and all
the register definitions. The procedure for creating a synchronous counter is the same as a isolated input with the addition
of changing the input type to PNP or NPN.
Discrete Inputs
Modbus Registers for Counter
Parameters
Register Definitions
Input 1
3013
Enable Rising
3014
Enable Falling
3015
Counter High
3016
Counter Low
Input 2
3033
Enable Rising
3034
Enable Falling
3035
Counter High
3036
Counter Low
5.5.5 Modbus Registers
The DXM MultiHop Modbus Slave device can have two Modbus Slave IDs: one for the MultiHop ISM radio (default 1) and
one for the I/O base (default to 11). All Modbus registers are defined as 16-bit Modbus Holding Registers. When connecting
additional Modbus slave devices, only use Modbus slave IDs 2 through 198.
DXM150-Sx Wireless Modbus Slave
32
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