I-O Display Systems Basic I/O Product - Manual (Page 51)

Introduction 1
1-5(Vol.2)
Digital inputs
Read Read the on or off of all inputs
Pulse widths The duration of a single or total on/off time of consecutive
pulses can be resolved to the nearest 0.00 seconds for a max
total of 10.9 minutes, or 46.6 hours with multiplied resolution.
Positive or negative edges initiate measurements. The time
scale can be multiplied by a factor of 1-256 on a system wide
basis.
Pulse counting Pulses can be counted up to a total or 65,535. To be reliably
counted, pulses must have minimum on and off times of 1
mSec. Thus the maximum counting rate for a 50% duty cycle
squarewave with equal on and off times for a total of 2 mSec.
Would be 500Hz.
Edge detection Off to on and on to off transitions can be detected within 1
mSec. Of their occurrence. Action is only reported every
10mSec.
Note: The response time performance of digital input instructions can be limited by the
delay in the input modules themselves which can nave on plus off delays of up to 40 mSec.
Digital outputs
Set Outputs Can set individual or multiple outputs on or off Modifiers
One Shot Can generate on or off pulse durations of up to 655.35 seconds
with a resolution of 0.01 seconds. Resolution can be further
multiplied by a factor of 1-256on a system wide basis.
Delayed Can generate on or off pulse durations of up to 655.35 seconds
with a resolution of 0.01 seconds. Resolution can be further
multiplied by a factor of 1-256on a system wide basis.