AnsweredAssumed Answered

vrf Writing stop code(?)

Question asked by VRFuser on Aug 4, 2008
John,

Sounds like you need a dead man switch.  That is, something that monitors the signals to the A/D I/O Module and will shut everything down if the signal is ever lost.

Rufus

-----Original Message-----
From: John Blamey [mailto:j.blamey07@imperial.ac.uk]
Sent: Monday, August 04, 2008 9:26 AM
To: VRF
Subject: [vrf] Writing stop code(?)

Dear VRF,

I have written a simple temperature control program in VEE - it's the first bit of programming I've done and leaves a lot to be desired, but it does most of the things that I want.

I have a USB based Analogue & Digital I/O Module from Measurement Computing (USB-1208FS), which I send an analogue signal from the computer, which is controlled by a cbAOut function (which came as part of a universal library from Measurement Computing) on VEE. 
Information is updated every second as part of an 'on cycle' and my reactor has power control 0-100%.

What I would like to know is if it is possible to set the output to zero automatically if VEE software is stopped. At the moment, if VEE is stopped (or crashes) mid operation, the temperature controller continues at the power it was most recently sent by the program. I have a button to press to send the power to zero at the end of an experiment (before closing VEE) and a high temperature cut off, but an extra level of safety is probably worth it as there are now other users (or as precaution if I knock myself out and someone has to shut down the reactor) and it's best not to leave the reactor running overnight.

This might be more of a hardware issue than a VEE issue, but any help would be greatly appreciated.

Thank you,

John


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