Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers - Manual (Page 95)

Using Analog
5–3
I/O Configuration
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.
Input Filter and Update Times
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 will be 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 will be to update.
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.