Rockwell Automation 1395 Digital Reference Adapter for RTP Applications - Manual (Page 53)

Publication 1395-RTP-5.2 - September 1997
Parameter Table 8-11
Parameter 552 – [A > ADC Scale #1]
Use: Digital Scale Factor for Analog Input 1
Program Terminal Units: None
Maximum Value: +16
Minimum Value: -16
Default Value: 1.10
Description: This parameter determines the digital scale factor or
Gain for Analog Input 1. A 0 to +10V DC signal applied to the input
of the analog to digital converter which is converted to a +2048 digital
value prior to being digitally scaled and digitally offset and used by
the Drive as the process trim reference input from the Dancer
potentiometer. Before the digital value is displayed or transferred to
the Drive, the Scale Factor is applied, thus allowing an effective
digital range of ±32767 (16 times 2048). The absolute digital value is
clamped at 32767.
Parameter 553 – [A > ADC Offset #1]
Use: Digital Offset for Analog Input 1
Program Terminal Units: Volts
Maximum Value: +20V DC
Minimum Value: -20V DC
Default Value: 0.0V DC
Description: This parameter determines the digital offset applied to
the output of the analog to digital converter of the Analog Input 1
value, before the digital scale factor is applied. This allows the user to
shift the range of the analog input.
Parameter 554 – [A > Analog P_Gain #2]
Use: Analog Programmable Gain for Analog Input 2
Program Terminal Units: None
Maximum Value: 4 (Corresponding to a gain of 16)
Minimum Value: 0 (Corresponding to a gain of 1)
Default Value: 0 (Corresponding to a gain of 1)
Description: This parameter is not used in the RTP Unwind Drive
application. This parameter digitally determines the analog gain for
Analog Input #2. The only allowable values for this parameter are 0,
1, 2, 3 or 4 which correspond to an analog gain of 1, 2, 4, 8 or 16
respectively. This analog gain is applied to the analog input #2 after
the analog offset is applied so that the input signal can have any
appreciable offset removed 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. In addition, if
necessary, this gain can be modified actively during Drive operation
in order to provide programmable trim gain if the application requires
this feature. (This feature has not been included in the present
software design).