Spectrum Controls 1756sc-IF8u - Manual (Page 52)

40 ControlLogix ™ Universal Analog Input Module
Input Type:
Each input type has a specific settling time. Select each channel input
type and add the time value.
Time (ms) Type Tag: .RangeType
0 All voltage, current, and thermocouple types
3 100_Pt_385 8
3 100_Pt_392 12
3 120_Ni_618 16
3 120_Ni_672 20
3 10_Cu_426 21
3 604_NiFe_518 22
3 0_250_Ohm 23
3 0_500_Ohm 24
4 200_Pt_385 9
4 500_Pt_385 10
4 200_Pt_392 13
4 500_Pt_392 14
4 200_Ni_618 17
4 500_Ni_618 18
4 0_1000_Ohm 25
4 0_2000_Ohm 26
8 1000_Pt_385 11
8 1000_Pt_392 15
8 1000_Ni_618 19
8 0_3000_Ohm 27
8 0_4000_Ohm 28
Example 1:
4 channels with 200 Ohm PT 385 RTD (Input Type 9) at 100Hz filter =
18ms + 4ms = 22ms * 4 channels = 88ms
2 channels of voltage at 1khz = 2 * 6ms = 12ms
2 thermocouples at 250Hz = 2 * 10ms = 20ms
Total = 5ms (overhead) + 26ms (CJC) + 88ms + 12ms + 20ms = 151ms
(Actual measured = 158ms)
Example 2:
8 channels, 0-4000 ohm (type 28) at 250Hz = 10ms + 8ms = 18ms * 8 =
144ms + 5ms = 149ms. (Actual measured = 117ms)
Note: This is approximation only. The time changes because the software
does not need to spend time setting up the ADC for another filter
frequency if it is the same as the previous channel. The same applys for
the the gain settings, etc. Example 2 illustrates there is a significant
savings because the filter frequency and input type are the same.
Note: If the autocalibration is enabled the module sampling time will
increase by as much as 500ms when autocalibration is being performed.