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Strange negation operator behaviour?


daves
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The following line in a motion program reports no errors in the IDE but will not download:

 

Motor[1].HomeVel = -Motor[1].HomeVel;

 

Is there something wrong with this syntactically?

 

The error message is (unhelpfully) "Error : ( error #31) invalid parameter number in equation".

 

The following similar lines work (the last one being how I get around the error):

 

Motor[1].HomeVel = -100;
Motor[1].HomeVel = -GlobalVar;
Motor[1].HomeVel = -(Motor[1].HomeVel);

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daves,

 

The firmware development team says that structures don't have a negation bit, hence we can't use structures in following format:

 

NOT ACCEPTABLE: P0=-Motor[1].ServoCtrl

 

but we can do the following, as you have already found out:

 

ACCEPTABLE: p0=-(Motor[1].ServoCtrl)

ACCEPTABLE: P0=0-Motor[1].ServoCtrl

 

 

 

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