Acquisition, Technology, General specifications – VXI VT1422A User Manual
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VXI
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Acquisition
Algorithmic Closed Loop Controller and
Remote Channel Multifunction
VT1415A/1422A
VT1415A/1422A
To calculate accuracy over temperature range outside the
±1 °C range, results after *CAL are given by replacing each of
the above error terms as follows:
Replace
(GainError)2
with
(GainError)2 + (GainTempco)2
Replace
(OffsetError)2
with
(OffsetError)2 + (OffsetTempco)2
Loop Control Specifications
Number of loops:
1 to 32
Default control
PID
algorithm type:
Maximum VT1415A loop update rate
for default PID algorithm:
(Note: VT1422A maximum sample rate is 25 kSamples/s,
compared to 56 kSa/s for the VT1415A. The loop
speeds of the VT1422A are reduced in same ratio.)
1 loop:
3 kHz
8 loops:
1 kHz
32 loops:
250 Hz
Custom algorithm development:
Language:
Subset of C programming
language including if-
then-else, most math and
comparison operations.
Variable types:
Scalar local and global
variables, array local and
global variables.
Intrinsic functions:
interrupt( ), writefifo( ),
writecvt( ),writeboth( ),
min( ), max( ), abs( ).
Other functions:
Create own custom
functions to handle
transcendental operations.
I/O General
A total of eight (8) Signal Conditioning Plug-ons (SCPs)
can be installed in most combinations of input or output
configurations on a single VT1415A/VT1422A.
Power Available for SCPs
±24 V:
1.0 A
5 V:
3.5 A
General Specifications
VXI device type:
A16, slave only,
Register based
Size:
C
Slots:
1
Connectors:
P1/2
Shared memory:
n/a
VXI buses:
TTL Trigger bus
Drivers:
VXIplug&play with
Source Code
Instrument Drivers - See the VXI Technology Website
www.vxitech.com for driver availability and
downloading.
VT1415A
Algorithmic Closed Loop Controller,