VXi VT1422A User Manual

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™

VXI

Acquisition

Online at vxitech.com

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Acquisition

Algorithmic Closed Loop Controller and

Remote Channel Multifunction

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,

Size:

Slots:

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,