Mettler Toledo MT User's Guide download pdf (Page 62)

IND780 User’s Guide

2-37

Range Comparators

In the case of a Range mode Comparator, the Limit value sets the lower of the two

limits that define the range, within or outside (depending on the operator) which

the output is active. For example, if the Active operator is Within (>_ _<), the Limit

is 3.0 kg/sec and the High Limit is 8 kg/sec, the output will be active provided the

rate remains between 3 and 8 kg/sec. If the rate falls below 3 or exceeds 8 kg/sec,

the output will turn OFF.

Note that comparisons using a Rate source require the rate calculation to be

enabled and the Rate display to be turned on. The Rate value configured in

setup at Scale > Rate permits weight and time units to be defined, together

with the period between individual measurements and the period over which

the measurements are averaged to generate the output value.

A Range Comparator can also use Displayed or Gross weight as its source. For

example, if displayed weight (possibly a net value, allowing for the weight of a

hopper) is the source, the Active operator is Outside, and the Limit and High Limit

are 1000 kg and 1500 kg respectively, the output will remain active as long as

the source value is below 1000 kg or above 1500 kg. In this case a large enough

value for the High Limit should be set to ensure that, once the Limit is reached and

the output turned off, there is not sufficient spill to reach the High Limit and

reactivate the output.

ID Mode

The ID function provides a convenient and simple way to ensure that a specific

sequence of operation is carried out the same way each time. Each step can

include an on-screen message that instructs the operator to perform an action, or a

prompt asking the operator to enter some information for a transaction printout.

These steps may include data entry (using the numeric keypad, alphanumeric

keys, or some other input such as a barcode scanner) and actions (such as

placing a package on the scale, taking a tare, or printing a ticket for the

transaction). When a step is completed, depending on the type of step it will either

automatically advance or pressing the ENTER key moves it to the next step.

The following list shows the types of steps that are programmable in a sequence.

• Alphanumeric prompt input • Select Tare ID

• Clear Tare • Select Target ID

• Numeric prompt input • Start Sequence

• Print • Tare Automatically

• Select Scale • Tare Preset

The ID function can be used in combination with the Material Transfer Control

function and latched outputs to perform a simple semi-automatic filling sequence.

To allow for this operation, the use of Target -Start, Target-Pause and Target-

Resume discrete inputs is also necessary. An example of an operator guided

container fill sequence is shown in Table 2-8.

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 128 129

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Mettler Toledo MT User's Guide Page 62

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