Instructions

UM-0085-B09 DT80 Range User Manual Page 69

If you need a CV to count beyond 16,777,216 then you will need to use two CVs to hold the count value, e.g.:

1CV=1CV+1 IF(1CV>1000000){2CV=2CV+1 1CV=0}

Naming Channel Variables

As with any other channel type, CV channels can be given name and units strings using the "CVname~Units" channel

option.

The command

NAMEDCVS

will return a summary of all CVs that have been explicitly named, e.g.:

CV S CV Name Value Units

==========================================

5 A Temp 89.1 Deg C

1 A Speed 23.4 m/s

(The "S" column is the schedule identifier)

Calculation Only Channels

If you need to return a calculated value then a channel variable is often used, e.g.

9CV("sum")=1CV+2CV+3CV

However, if you are just logging the result of this expression, and are not going to do any further calculations with it, then

there is no point storing the result in

9CV.

The CALC channel type is a better choice here. An expression can be assigned to it, and the result will be logged in

exactly the same way as a CV. The only difference is that it does not actually copy the result to any particular channel

variable.

For example:

CALC("sum")=1CV+2CV+3CV

Reference Channels

A reference channel is used to reference the value of another channel, which is identified by name. In this way a

measurement can be used is multiple places without having to assign it to a channel variable.

To define a reference, use an ampersand followed by the name of the channel whose value you wish to reference, i.e.

&channel. For example:

RA1S 1V &1V

In this (not very useful) example a voltage is measured once but reported twice – once by the original channel and once

by the reference to the channel.

 Names

If the "source" channel has a user-defined name then it must be used when defining a reference, e.g.

RA1S 1V("Voltage12") &Voltage12

If the source channel's name has spaces or special characters (anything other than A-Z, 0-9, or _) then it should be

enclosed in quotes, e.g.

RA1S 1V("Voltage no. 12") 1+TK &"Voltage no. 12" &"1+TK"

Note: name comparisons are not case sensitive, so &BIG is a valid reference to 1R("big").

If there is more than one source channel with the same name (a practice that is not recommended) then the reference

will refer to the first one defined. e.g.

RA1S 1V("a") 1R("a") &a

defines a reference to the voltage, not the resistance.