Weidmuller WI-I/O 9-L: Wireless I/O Transmitter / Receiver v1.3 - Manual (Page 81)

WI-I/O 9-L Configuration Manual
WI-I/O 9-L Wireless I/O page 81 of 108
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This section describes how to set additional unit detail information including:
Sample period and warmup time - the WI-I/O 9-L-T only turns on the analog circuits
and the +24V analog loop power supply when they are actually required. You can
reduce the module power consumption by limiting the amount of time the analog
circuitry and the +24V analog loop supply is enabled.
Sample period determines how often the module checks an analog signal. Warmup
time determines how long the analog circuits are powered up before performing the
sample. The analogue circuitry is powered all the time if the warmup period for any
analog input is set to a value longer than the sampling period.
By setting the sample time as long as possible, and setting the warmup time as short
as necessary to power the external conditioning circuitry, the module power
consumption can be reduced; and
Debounce time - the amount of time an input needs to have differed from its previous
value before it is recognised as having changed. This helps with noisy signals.
Inputs subject to a high level of noise can cause the module to transmit multiple
messages due to random changes to the input level.
By setting the debounce time to a larger value, the signal needs to change by the
configured sensitivity for some time before a change is registered and a new message
is sent.
WI Series lets you set the following options:
Feature Description Example
Thermocouple debounce For analog signals (e.g. thermocouple, analog
4-20 mA, and module temperature), debounce
time is the product of the number of samples
and the sample period. The signal must differ
from the previous value by the sensitivity value
for this duration to register a ‘change of state’.
This means that changing the analog sample
time will also change the debounce time. For
analog signals a value of 0 or 1 generates the
quickest response, and 255 the slowest
response.
Thermocouple sample
period
This sets the period between samples of the
thermocouple input.
A smaller value will cause mappings using this
input to be triggered more frequently (i.e.
quicker response).
A larger value will cause mappings using this
input to be triggered less frequently (i.e. less
power consumption).