Impulse MAQ20-940 User Manual - Manual (Page 21)

ReDAQ
®
Shape Software for MAQ
®
20 User Manual
21
The MAQ
®
20 analog input values have 12-bit resolution plus sign, which equates to a full scale range
of -4095 to 4095 counts. This count range can be scaled to any engineering units on a per-channel
basis. By default, the analog input channels are scaled to the selected input range. For example, if
an input range of -5 to +5V is selected for a given channel, then collected data for that channel is
automatically scaled to -5 and +5V.
Analog input data in counts always represents the full range of the signal applied to input channel.
How this data maps to actual engineering units depends the internal mapping of the signal range to
counts and on the scale setting chosen.
Example:
Channel 0 is connected to a sensor which outputs 0V to +5V to represent 0 to 120 MPH.
Data from a channel 0 of a MAQ20-VDN input module is read.
Channel 0 input range set to -5 to +5.
A data value of 0x0000 (0V) corresponds to an input of 0 MPH.
A data value of 0x0FFF (+5V) corresponds to an input of 120MPH.
To scale the 0 to +5V input range to a linear representation of the 0 to 120MPH input range, enter the
data shown below:
Control Loop / Alarm tab:
The Control Loop / Alarm tab provides a simple interface to select control loop or alarm output states
of High, Low, High-High or Low-Low, as well as to configure the output active states and set the
alarm limits and dead-band. The Control Loop and Alarm outputs can be mapped to any system
Discrete Output channels , and/or to any system Analog Output channels.
To use the Control Loop or Alarm Output function: