Version 2.0.3 Preliminary Documentation – May be Subject to Change 32-36
APPENDIX A – Technical Specifications
Input Power
Power Supply Input - Nominal
12, 24VDC nominal (9…32 VDC power supply range)
Surge protection is provided.
If batteries are used, an alternator or other battery-charging device is necessary to maintain a
stable supply voltage. Central suppression of any surge events should be provided at the
system level. The installation of the equipment must include overcurrent protection between
the power source and the module by means of a series connection of properly rated fuses or
circuit breakers. Input power switches must be arranged external to the 16 Analog I/O
Module.
Power input wiring should be limited to 10 meters.
Reverse Polarity Protection
Provided
Input Signals
All Inputs
Up to 8 inputs are selectable by the user. All inputs, except for frequency, are sampled every
1ms. The user can select the type of filter that is applied to the measured data, before it is
transmitted to the bus. The available filters are:
•
Filter Type 0 = No Filter
•
Filter Type 1 = Moving Average
•
Filter Type 2 = Repeating Average
With the CAN model, AX030200, all input channels are completely independent of each other as well as
can simultaneously control an on-board output and send a message to the J1939 bus. There are five
setpoints per channel that are associated with the input and how the data is measured. There are four
setpoints per channel that are associated with how the measured input will control an output on the
controller.
Input Configuration
Up to 8 inputs are available.
Refer to Table 1.0.
Each input can be configured for any one of the following options.
•
Disable
input
•
0…5VDC or 0…10VDC
•
4…20mA or 0…20mA
•
Digital input
•
PWM
signal
•
Pulse (Hz or RPM)
•
16-bit
Counter
Threshold Levels
For digital, PWM, pulse or counter inputs the voltage threshold levels are:
Input positive threshold (signal goes from low to high):
Min. 2.2V, typical 2.9V, max. 3.6V
Input negative threshold (signal goes from high to low):
Min. 1.2V, typical 1.7V, max. 2.3V
Analog GND
8 Analog GND connections are provided.
Voltage References
8 +5V references (sourcing up to 10 mA) +/- 0.1%
or 8 20 mA constant (voltage up to power supply) +/-0.2%
Input Accuracy
0-5V: +/- 0.3%
0-10V: +/- 0.2%
0-20mA: +/- 0.35%
PWM, single channel: +/- 0.05% to +/- 1.25% (over the 500 Hz to 10 kHz range)
(NOTE: When selecting all input types as “PWM Duty Cycle” the inputs will be accurate at
frequencies above 3 kHz.)
Frequency/RPM, single channel: +/- 1%
16-bit counter, single channel: +/- 3 mSec (@50 Hz)
Input Resolution
0-5V: 1 mV resolution
0-10V: 1 mV resolution
0-20mA: 1 µA resolution
PWM, single channel: +/- 0.05% to +/- 1.25%, 2 decimal place resolution
NOTE: If the Input Maximum setpoint is set for a low frequency (<=50Hz), the
controller will use a different technique to measure the frequency. Instead of
measuring the pulses in the Measuring Window (this parameter is ignored) it will
measure the time between rising edges of the signal. If more than 10 seconds
pass without a transition, the input will be read as zero. The frequency range in
this mode is 0.5-50Hz, with up to 2 decimal places of resolution.
Frequency/RPM (single channel)
0.5 Hz to 50 Hz: +/- 0.01Hz, 2 decimal place resolution
50 Hz to 10kHz: +/- 1Hz, 0 decimal place resolution
16-bit counter, single channel: 1 pulse resolution
Input Scan Rate
1 mSec.
