Rice Lake 520 HMI Digital Weight Indicator Installation Manual - Manual (Page 52)

Counting Operations 46
6.0 Counting Operations
The 520 provides a piece count mode that allows the
indicator to serve as a counting scale. In piece count
mode, the indicator display shows the number of parts
on the scale rather than the weight of those parts.
Note
Legal-for-Trade applications require product to
be sold by weight rather than an equivalent
parts count. Operator access to piece count
mode is disabled when the indicator is shipped
from the factory.
To enable operator access to piece count mode, set the
ACCESS parameter to ENABLE (COUNT submenu
on the PROGRM menu) or send the CNTMOD=
ENABLE EDP command.
Piece count mode has two submodes:
• Count display mode displays the current parts
count and allows ticket printing using the
CFMT print format.
• Sample acquisition mode is used to calculate
the average piece weight of the sample for
parts counting.
Count Display Mode
Piece count mode is entered by pressing the
MODE
(
GROSS/NET
) key from normal weighing mode. In
count display mode, the display shows the number of
parts rather than weight, the two-digit annunciator
displays
PC
, and pressing the
PRINT
key sends the
CFMT print format data string to the serial port.
If a sample weight has not yet been acquired, the
indicator switches automatically to sample acquisition
mode.
Sample Acquisition Mode
Sample acquisition mode is used to select the sample
quantity and calculate the average piece weight for the
parts being counted.
To set a new sample weight, do the following:
1. Place empty parts container on scale. Wait for
standstill, then press
TARE
to acquire the tare
weight of the container.
2. Press
MODE
to enter piece count mode.
3. From count display mode, press the
SAMPLE
(
UNITS
) key to enter sample acquisition mode.
4. The indicator display shows the message
Addnnn
, where
nnn
is the sample quantity to be
placed on the scale. Add the number of parts
shown or choose a different sample size by
pressing the
SAMPLE
key to scroll through the
selectable sample quantities (5, 10, 20, 50,
100).
5. Once the sample quantity is on the scale, press
ENTER
to calibrate the indicator for counting
the new parts. The indicator display shows the
message
–CNT–
as it acquires the sample
weight, then switches to count display mode
and shows the part quantity.
If the weight of the sample quantity is
insufficient for piece counting, the indicator
automatically requests the next higher sample
quantity by showing the
Addnnn
message again.
If the sample quantity is at maximum (100)
and the sample weight is still not sufficient, the
indicator shows the message
CNT ERR
.
To view gross and net weight of parts, press
MODE
to
switch from count display mode to normal weighing
mode.
ENTER SAMPLE MODE
New sample /
change sample quantity
Send data to
serial port
(CFMT format)
Not used
Switch between gr oss, net,
and piece count mode
Acquir e tar e /
acquir e sample
COUNTING MODE KEY FUNCTIONS
Figure 6-1. Front Panel Key Functions in Piece Count Mode