Problem setting up an encoder input and PWM output tasks on CompactDAQ

I use a chassis with a modules 9474 cDAQ-9174 and 9411. I do not think it is important, but they are the cRIO-XXXX modules NOR old provided with a test configuration that has been distributed to early adopters. I use DAQmx tasks in an application (C libraries) to read (angular position) quadrature encoder and drive a motor directly with PWM current (pulse output). For various other needs, my tasks Setup is as follows:

[DAQmx] MajorVersion = 9

MinorVersion = 2

[DAQmxChannel venture 9411 wheel entry/AngularPosition]

CI. AngEncoder.PulsesPerRev = 500

CI. AngEncoder.InitialAngle = 0

CI. Encoder.ZIndexVal = 0

CI. Encoder.ZIndexPhase = a Low high B

CI. Encoder.ZIndexEnable = 0

ChanType = input meter

CI. MeasType = Position: angular encoder

CI. AngEncoder.Units = ticks

PhysicalChanName = cDAQ1Mod2/ctr2

CI. Encoder.DecodingType = X 4

[DAQmxChannel venture 9474 PWM output/PulseOutput]

CO. LTD.. Pulse.IdleState = low

ChanType = output meter

CO. LTD.. OutputType = Pulse:

CO. LTD.. Pulse.HighTime = 5.0000000000000004E - 006

CO. LTD.. Pulse.LowTime = 5.0000000000000002E - 005

CO. LTD.. Pulse.Time.InitialDelay = 0

CO. LTD.. Pulse.Time.Units = seconds

PhysicalChanName = cDAQ1Mod1/ctr3

[DAQmxTask venture 9411 wheel entry]

Channels = venture 9411 wheel input/AngularPosition

SampQuant.SampMode = continuous samples

SampClk.ActiveEdge = Rising

SampQuant.SampPerChan = 100000

SampClk.Rate = 100000

SampTimingType = sample clock

SampClk.src=/cDAQ1/100kHzTimebase

[DAQmxTask venture 9474 PWM output]

Channels = venture 9474, output PWM/PulseOutput

SampQuant.SampMode = continuous samples

SampQuant.SampPerChan = 100000

SampTimingType = implied

RegenMode = allow regeneration

[DAQmxCDAQChassis cDAQ1

] ProductType = cDAQ-9174

DevSerialNum = 0x18B3EC0

[DAQmxCDAQModule cDAQ1Mod1]

ProductType = NOR 9474

DevSerialNum = 0xDEDF40

CompactDAQ.ChassisDevName = cDAQ1

CompactDAQ.SlotNum = 1

[DAQmxCDAQModule cDAQ1Mod2]

ProductType = NOR 9411

DevSerialNum = 0xDEDB24

CompactDAQ.ChassisDevName = cDAQ1

CompactDAQ.SlotNum = 2

Each task works fine on its own (i.e. without the other). The problem is that if I start the task of the encoder first and then the task PWM, the latter causes an error:

Error-89137 occurred to the DAQ Assistant
Possible reasons:
Specified route can not be satisfied, because it requires resources that are currently in use by another route.

Source device: cDAQ1
Point source:
80MHzTimebase
Destination device: cDAQ1
Destination
Terminal:
Ctr3Source

Need for resources in use by Source
Feature:
cDAQ1
Terminal of source: 100kHzTimebase
Destination
Feature:
cDAQ1
Destination terminal: Ctr2SampleClock

The task name: _unnamedTask<61>

I don't know why this is, but if I start the PWM task first, and then the task of the encoder, it also works. I should also mention that initially I was using counter 0 encoder, which caused a shift in the 100kHzTimebase to Ctr0SampleClock, which, according to the ways of device 9411, is not supported. Yet it worked (in itself). I wonder if this is happening under the hood isn't quite what is shown.

What is exactly the conflict and what can do to avoid it? The reasons for having to use specific modes and the settings (for example, the 'continuous samples' with 100kHzTimebase clock) are rooted in various performance and requirements of optimization that were created in a previous version of our software, so I prefer not to take a completely different path, if some small changes would lead us to correct the problem.

I appreciate your help.

Kamen

Hi Kamen,

The time base of 100 kHz is not a direct route to the counter sample clocks, the device actually uses one of the other counters to complete the road (the routing table is a little misleading here because it shows 2 meter that one always doing road - in fact it will be any available counter):

So in your case, when you start the task of the encoder, it uses one of the other available counters to complete the configured road (100 kHz to ctr2 sample clock timebase).  Of course, she chose meter 3.

Possible workarounds (looks like you have already found one yourself):

1 start the PWM before the task of the encoder task - if the task PWM starts first the counter is already booked and the task of the encoder would choose another available counter to complete its road.

2. explicitly reserve the PWM task before you begin the task of the encoder (if you need to start the task of the encoder first).

3. use cDAQ1/_freqout to generate the clock sample 100 kHz signal and use this instead of routing to the time base of 100 kHz to the counter sample clock.

Change autour counters should also work, but I'm not 100% sure how the unit selects which counter to use for routing (I don't expect change in the future, but if it's not explicitly spec'ed somewhere so I wouldn't take my chances)-if it were me, I would choose one of the other options above.

Best regards

Tags: NI Hardware

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