• 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 Tool 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 type, enable full scale, threshold and hysteresis. Refer to the DXM100 Controller Instruction Manual (p/n
190037) 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 I/O Base Board (Modbus Slave
200) on page 47 for universal input register definitions.
Pin Univ. Input Description
27 Universal Input 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 I/O Base Board (Modbus
Slave 200)
on page 47.
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 Universal Input 3
31 Universal Input 2
32 Universal Input 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 I/O Base Board (Modbus Slave 200)
on page 47.
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.
Synchronous
Counters
When an input is configured as a counter (inputs set to NPN/PNP), the input counts the input signal
transitions. The count 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 25.
Synchronous counter sample the inputs every 10 ms. The input logic does not detect rising or
falling edges, but instead 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.
Example: Configure Input 1 as a Synchronous Counter
1.
Launch the DXM Configuration Tool.
2. Click on the Register View tab on the left part of the page.
3. Change the Source Register selection to I/O Board Registers.
4. In the Write Registers area, write Modbus register 4908 to 1 to enable counting on the rising edge of the input signal.
5. Read Modbus registers 4910 and 4911 to get the 32-bit value of the count.
Example: Change Universal Input 2 to a 0 to 10 V dc Input
1. Launch the DXM Configuration Tool tool.
2. Click on the Register View tab on the left part of the page.
3. Change the Source Register selection to I/O Board Registers.
4. Write a 3 to Modbus register 3326 on Modbus Slave ID 200 (I/O board).
DXM100 Controller Instruction Manual
www.bannerengineering.com - Tel: 763.544.3164 25
To Next Page
Loading...
