Pin
Parameter
Description
Pin 14
Secondary RS-485 +
Pin 15
CANL –
Pin 16
CANH +
3.4 Inputs and Outputs
The I/O base board is a Modbus slave device that communicates using Modbus commands. Refer to the Modbus Registers
section for more descriptions of each Modbus register on the DXM100-Sx Modbus Slave.
3.4.1 Universal Inputs
The universal inputs on the DXM100-Sx Modbus Slave can be programmed to accept several different types of inputs:
•
Discrete NPN/PNP
•
0 to 20 mA analog
•
0 to 10 V analog
•
10k temperature thermistor
•
Potentiometer sense
•
Bridge
•
NPN raw fast
Any input can be used as a synchronous counter by configuring the input as a discrete NPN/PNP input.
Use the DXM Configuration Software tool to write to the appropriate Modbus registers in the I/O board to configure the input
type. The universal inputs are treated as analog inputs. When the universal inputs are defined as mA, V, or temperature, use
Modbus registers to configure the operational characteristics of the inputs. These parameters are temperature conversion
) for the
parameter definitions.
When a universal input is configured as an NPN or PNP input type, it can be enabled to be a synchronous counter. Enable
the counter function by setting Modbus register 'Enable Rising' or 'Enable Falling' to 1. See
on page 24 for universal input register definitions.
Pin
Universal Input
Modbus Register
Description
27
4
4
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 defined in
Modbus I/O Registers for the DXM100-S1x I/O
on page 24.
0 = NPN
1 = PNP
2 = 0 to 20 mA
3 = 0 to 10 V DC
4 = 10k Thermistor
5 = Not used
6 = Not used
7 = Bridge
8 = NPN Raw Fast (default)
28
3
3
31
2
2
32
1
1
Thermistor Input
A thermistor input must use a 10k temperature thermistor between ground and the universal input. The thermistor
must be a 10k NTC (Banner model number BWA-THERMISTOR-002) or equivalent. Select the temperature
conversion of degrees C (default) or degrees F by writing Modbus registers defined in
on page 24.
Potentiometer Input
A potentiometer input is created from three inputs: a voltage source (pin 30) that supplies 5 V to the potentiometer
and two inputs set to voltage inputs to read the voltage across the potentiometer. See the DXM tech note for setting
up a potentiometer.
Bridge Input
The bridge input is not implemented yet.
NPN vs NPN Raw Fast
The difference between NPN and NPN Raw Fast is the amount of settling time given to the input. Switch the input
type to NPN if the input is not detecting a transition.
Sure Cross
®
DXM100-Sx Wireless Modbus Slave
www.bannerengineering.com - Tel: + 1 888 373 6767
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