Multipliers, Offsets, and Disable Variables with Repetitions

Most measurement instructions have a Repetitions (Reps) parameter, that allows you to measure multiple sensors with one instruction if the sensors are wired into consecutive terminals. Most measurement instructions also use a Multiplier and an Offset parameter that can be used to scale the resulting measurement or convert it to a different engineering unit. Repetitions can also be used with the Multiplier and Offset parameters to apply a different multiplier and/or offset to each repetition. This can be helpful in measuring multiple sensors that, while they are the same sensor, may have different calibration values.

This same syntax can be used for the DisableVar parameter for most output instructions.

As an example, consider the following program:

Public Temp(5), Mult(5), PTemp

BeginProg
    Mult(1)=1
    Mult(2)=10
    Mult(3)=100
    Mult(4)=1000
    Mult(5)=10000
    Scan (1,Sec,3,0)
      PanelTemp (PTemp,4000250)
      TCDiff (Temp(),5,mv34mV2_5,11,TypeT,PTemp,True,0,4000250,Mult(),0)
    NextScan
EndProg

The TCDiff instruction is programmed for five repetitions. With the first execution of the instruction during a program scan, a Multiplier of 1 is used. With the second execution, a multiplier of 10 is used. With the third execution, a multiplier of 100 is used, and so on.

The syntax used for the Multiplier and/or Offset must be considered carefully, or the results may not be as you expect. Consider the following example for a multiplier variable (Mult) and the results based on syntax:

Variable used	Result
Mult	Instruction uses the first variable, Mult(1), for all repetitions
Mult( )	Instruction starts with the first variable, Mult(1), and the Multiplier is incremented with each repetition
Mult(1)	Instruction uses the first variable, Mult(1), for all repetitions
Mult(2)	Instruction uses the second variable, Mult(2), for all repetitions
Mult(2)( )	Instruction starts with the second variable, Mult(2), and the Multiplier is incremented with each repetition

Note that if an expression is used for the Multiplier or Offset (for example, Mult(1) * 3), all reps will use the same value, regardless of the syntax used.