Electro Cam PL-1746 Series - Manual (Page 87)

4-42 PLS Functions
Shift Window
Backplane
PL-1746 Function Name SLC 500 Mapping Read/ Valid Range for Data
File Index Write
Address Number Capability
Window On M0:S.918 1964 R/W 0 to (Scale Factor-1)
Window Width M0:S.919 1966 R/W 0 to (Scale Factor-1)
Screen Menu Path
MAIN SCREEN to CONFIG MENU to SECONDARY SETUP SHFT
WINDOW
Beginning of window = ON; WT is the width (size)
SHIFT WINDOW
ON: 0 WT: 0
Use numeric entry, followed by ENT, to change ON and WT.
Description The point in a revolution at which Terminal IO of the pluggable input header enters a bit
into bit 0 of the Shift Register is programmed through the Shift Window screen. When
programming Shift Position and the Shift Window, remember the following:
When a pulse starts at the beginning of the
Shift Window, as shown here, the pulse will be
enabled as soon as a bit is shifted into the
programmed shift count.
Although the output will function normally on this
revolution, a small output spike may occur on the
following revolution as the bit is shifted to the next
shift count.
Don’t Place the Shift Position at the Start of the Shift Window
Shift
Window
On at 220
Width = 70
Shift
Position
220
0
500
The Product Present input (terminal IO) is rising edge triggered. The leading edge of
the signal must appear in the Shift Window for a bit to be set in the Shift Register.
Edge Sensitivity of the Product Present Input
(Shift Window programmed “on” at 650, “width” of 100 in this example; Shift Position = 0)
Terminal IO
Leading & Trailing Edges
Within Shift Window;
Bit Set at 0 In Register
Terminal IO
Leading Edge
On Before Shift window;
Bit Not Set
0
500
0
500
0
500
Terminal IO
Leading & Trailing Edges
Outside Shift Window;
Bit Not Set
Terminal IO
Leading Edge
On Within Shift Window;
Bit Set at 0 In Register
Shift
Position
0
500
Shift Window Shift Window Shift Window Shift Window
Shift
Position
Shift
Position
Shift
Position