Maple Systems MAPware-7000 - Manual (Page 107)

99 MAPware-7000 Ladder Logic Guide
1010-1041 rev. 00
Instruction 61- Bi-directional Shift Register
Expression:
Space Requirement: 4 line x 3 column Location Requirement: Middle, Right rail
Function:
While the enable input (E) is ON, this instruction shifts the data of the bit table, size n starting
with A, 1 bit when the shift input (S) is ON. The shift direction is determined by the state of the
direction input (L).
When L is OFF, the direction is right (lower address direction).
When L is ON, the direction is left (upper address direction).
The state of the data input (D) is stored in the highest bit if right shift, and stored in the lowest
bit A if left shift. The pushed out bit state is stored in the carry flag (CF = S976).
When the enable input (E) is OFF, all bits in the table and the carry flag are reset to O.
Execution Condition:
Input Operation Output CF
OFF Reset all bits in the bit table OFF Reset
ON S = ON L = ON Shift left execution Highest bit state Set or Reset
L = OFF Shift right execution Lowest bit state Set or Reset
S = OFF No execution Highest bit state ---
Operand:
Coil or Bit Register Constant Index
Name X Y B S T. C. M
X
W Y
W B
W S
W
T C D I J K
M
W
A
Leading
Device
√ √ √
n Device Size 1-64