3-24 Programming
Shift Register ANDing
Menu Path
MAIN SCREEN
to CONFIG MENU
to CHN ANDING MENU
SHFT
REG ANDING
Background
The shift register is a form of electronic memory that sets a “bit” in the zero count of the
register when a signal is applied to Terminal 16, Fig. 7. Afterwards, each time the en-
coder passes the point programmed through SHIFT POSITION, the register “shifts” the
bit to the next higher count. The bit passes along the shift register until, on the 256th
shift, the bit is erased.
An output channel can be ANDed with any count in the shift register, so that the chan-
nel is enabled only when a bit appears in that count. In this way, output channels can be
enabled up to 255 revolutions after Terminal 16 is energized.
Programming
This screen allows you to enter the output channel to ANDed with the shift register, and
the shift register count that will enable it.
To select the output channel and the shift register count, use the numeric keys and
ENT, or use the INC and DEC keys.
• ANDing an output channel with Count “0” is the same as turning Shift Register
ANDing off. The shift register will have no affect on channel operation.
• Any number of output channels can be ANDed to a single shift register count.
• Shift Register ANDing, Input ANDing, and Motion ANDing can be combined for any
given output channel.
Input Window
A bit is set in Position “0” of the shift register when Terminal 16 of TB 1, Figure 7, is
energized. A special channel, Channel 91, is provided to limit the portion of an encoder
revolution during which the signal will be accepted from Terminal 16. A “window” can
be programmed into Channel 91 so that a bit is set in the register only if Terminal 16
becomes energized within that window.
Count:
0
1
2
3
4
253 254 255
Zero Bit is Set
If Terminal 16 is
Energized Within
Channel 91 Window
Bit Shifts Up Once
Each Time Encoder
Passes Shift Position
Bit is Erased
On Last Shift
Output Channels
Can Be ANDed with Any
Shift Register Count
Output Channel to be ANDed
Shift Count That Will Enable Output Channel
CHN: 1
SHIFT COUNT: 0