Curtis 1356/1356P CAN Expansion Module Manual,
Rev. A
37
Analog Input Algorithms
The voltage range of the five analog inputs is 0–15V and is scaled as 0–4095.
The analog inputs are sampled after the driver output currents have been sam-
pled. Each analog input is filtered by a single pole exponential filter. The Filter
Gain parameter is associated with the Timer Constant (TC) of the filter, which
indicates how long it takes the filter to respond to a step input and reach 63%
of the final value. It takes approximately 5 TCs before the filtered signal reaches
its full output. The table below provides a way to estimate filter response.
FIL
TER
VALUE
100%
63%
TIME
Time
Constant
Step Input
Filtered Response
5 — SDO: Parameter Profile Objects
Exponential Filter Response
Setting
TC
Time to 100%
1
64
.
s 320
.
s
2
32
.
s 160
.
s
4
16
.
s 80
.
s
8
8
.
s 40
.
s
16
4
.
s 20
.
s
32
2
.
s 10
.
s
64
1
.
s 5
.
s
128
512
.
ms
2.5 s
256
256
.
ms
1.25 s
512
128
.
ms 640
.
ms
1024
64
.
ms 320
.
ms
2048
32
.
ms 160
.
ms
4096
16
.
ms 80
.
ms
8192
8
.
ms 40
.
ms
16384
4
.
ms 20
.
ms
The analog input can be configured as voltage input type or as resistive input
type, using the Curtis programmer or an SDO. The value measured at the five
analog inputs can be mapped to the two MISO PDOs as filtered voltage (in
units of 0.01 V) or resistance (in units of ohms), depending on the setting of
the Analog Input Type parameter. In addition, the value can also be monitored
by the Curtis programmer.
Summary of Contents for 1356
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