Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 116)

Chapter 7
Using Analog
7–2
The analog input channels are single-ended (unipolar) circuits and can be
individually enabled or disabled. The default is all input channels enabled.
The two voltage inputs accept
"10.5V dc and the two current inputs accept
"21 mA.
The analog output channel is also a single-ended circuit. You can configure
either voltage (0V dc to +10V dc) or current (+4 to +20 mA) output
operation. The default is voltage output.
The output must be configured for either voltage or current, not both. This is
determined by the output configuration. When in the Run mode and the
output is configured for voltage, the voltage output terminal is active and the
current output terminal is inactive. Similarly, when in the Run mode and the
output is configured for current, the current output terminal is active and the
voltage output terminal is inactive. When the system is not in Run mode,
both the voltage and current outputs are inactive. Refer to page 18–14 for
more information on how to configure the analog inputs and outputs with the
MicroLogix 1000 HHP.
The MicroLogix analog input filter is programmable. The slower the filter
setting, the more immune the analog inputs are to electrical noise. The more
immune the analog inputs are to electrical noise, the slower the inputs are to
update. Similarly, the faster the filter setting, the less immune the analog
inputs are to electrical noise. The less immune the analog inputs are to
electrical noise, the faster the inputs are to update.
The selected setting is applied to all four analog input channels. The settings
supported are shown in the following table. Both the analog input resolution
and the analog input settling time are a function of the input filter selection.
Programmable Filter Characteristics
1st Notch Freq
(Hz)
Filter
Bandwidth
(-3 dB Freq Hz)
Update Time
(mSec)
Settling Time
(mSec)
Resolution
(Bits)
10 2.62 100.00 400.00 16
50 13.10 20.00 80.00 16
60
➀
15.72 16.67 66.67 16
250 65.50 4.00 16.00 15
➀
60 Hz is the default setting.
The total update time for each channel is a combination of the Update Time
and the Settling Time. When more than one analog input channel is enabled,
the maximum update for each channel is equal to one ladder scan time plus
the channel’s Update Time plus Settling Time. When only one analog input
channel is enabled, the maximum update for the channel is equal to the
Update Time plus one ladder scan time.
I/O Configuration
Input Filter and Update Times