d
The intensity of the display can be controlled by the knurled, slotted plastic
screw on the bottom of the panel. Rotating the screw clockwise increases
the intensity of the display.
6.2.1 Reference Data Area
The reference data area contains three separate displays; network,
reference, and data. (See Figure 6-2.)
6.2.1 .l Network Display
The two digit network display indicates which of 9 (I8 in the M48A-002)
networks is currently being viewed. The keyboard allows the user selection
of any network. Each network can contain up to 28 logic elements.
6.2.1.2 Reference Display
The four digit reference display, when used in conjunction with the cursor’s
position, displays an element’s assigned reference number if any. If the
cursor is positioned on the upper node of a double node element, the
preset is displayed. For the lower node, the reference number of the
holding register is displayed.
6.2.1.3 Data Display
The four character data display contains the register contents, or element
status, of the logic element at the current cursor position. The register
contents is a numeric value in the range from 000 to 1023. The element
status is either OFF or ON.
6.2.2 Node and Element Display
The node display (see Figure 6-3) is the area where power flow for each
node within a network is displayed in ladder diagram form. Power flow
through a node’s associated element illuminates that node. A particular
node can be selected by moving the cursor; the node on which the cursor
is positioned blinks and the element is displayed in the element display
area. (Figure 6-3 Node Display Area.)
The element display (see Figure 6-4) has two sections; the left section for
single node elements (contacts, coils), the right section for the upper or
lower half of double node elements (counters, timers, arithmetic
operations). When the cursor is positioned on a node, only one section of
the element display illuminates, indicating the type of element contained
within that node. If the cursor is placed on the top node of a double node
element, only the’top node is displayed. (See Figure 6-4 Element Display
Area.)
6.2.3 Status Indicators
I
Five status indicators are contained on the right section of the
programming panel. Four of the indicators are a part of the LCD display
while the fifth (ELEMENT STATUS) is on the face of the panel.
..?
6-3
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