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NI 9144 User Guide and Specifications
The current limits are set in index 0x2002 sub-indices1 (Limit A) and 2 (Limit 2). The current
limits are 8-bit unsigned integers in increments of 20 mA (1 = 20 mA, 2 = 40 mA, and so on).
Error Status and Overtemp
The two error status fields each hold 16 bits of data (one bit per channel, with bit 0 for
channel 0). The error status bits in 0x2002.1 are for Limit A reporting. Bits 0x2002.2 are for
Limit B reporting.
Errors are reported for at least one cycle and are automatically cleared by the module when
appropriate.
The Error Overtemperature field has seven bits to ignore and one bit (bit 0) that when set
indicates that the module in an over-temperature condition.
Refresh Period
This is the period over which output values that may have experienced an over-current condition
are re-enabled. An eight byte value in 10
μ
s is listed in the following table.
NI 951
x
Refer to the
NI 951x C Series Modules Object Dictionary
, available from
ni.com/manuals
,
for NI 951
x
C Series drive interface module object dictionary entries.
C Series Modules with No Configurable Options
The supported C Series modules with no configurable options are as follows:
•
NI 9375
•
NI 9411
•
NI 9421
•
NI 9422
•
NI 9423
•
NI 9425
•
NI 9426
Bits
Field
7..1
Reserved
0
Overtemp
Value
Description
0
Infinity (no refresh)
1
Invalid value
2..255
20 to 2,550
μ
s refresh period
