Rockwell Automation 1395 Digital Reference Adapter for RTP Applications - Manual (Page 52)

Publication 1395-RTP-5.2 - September 1997
8-10 Parameter Table
Set-Up Parameters This chapter describes the Set-Up parameters for the Digital
Reference Adapter Board. The Set-Up parameters control how the
Digital Reference Adapter Board manipulates data. Specifically they
allow programming the use of the Digital inputs in the logic state
machine and they alternatively program the bit positions for digital
inputs and outputs along with scale factors and offsets for analog
inputs and outputs.
Parameter 550 – [A > Analog P_Gain #1]
Use: Analog Programmable Gain for Analog Input 1
Program Terminal Units: None
Maximum Value: 4
Minimum Value: 0
Default Value: 3 (Corresponding to a gain of 8)
Description: This parameter digitally determines the analog gain for
Analog Input #1. The only allowable values for this parameter are 1,
2, 3, or 4 which correspond to an analog gain of 1, 2, 4, 8 or 16. This
analog gain is applied to the analog input #1 after the analog offset is
applied so that any appreciable offset can be removed from the input
signal prior to being amplified. The amplification is important in
order to provide as much signal resolution to the input of the analog to
digital converter. Additionally, if necessary, this gain can be modified
actively during Drive operation to provide programmable trim gain
(should the application require it). (This feature has not been included
in the present software design.)
Parameter 551 – [A > Analog Offset #1]
Use: Analog Offset for Analog Input 1
Programming Terminal Units: Volts
Maximum Value: +10V DC
Minimum Value: -10V DC
Default Value: 0.0V DC
Description: This parameter determines the analog offset applied to
the Analog Input #1 signal prior to the analog signal amplification.
This allows the signal to be shifted close to zero volts prior to being
amplified.