Delta MH300 Series - Page 905

Chapter 16 PLC Function ApplicationsMH300
16-42
16-6-2 Detailed explanation of basic commands
Command
Function
LD
Load contact A
Operand
X0–X17
Y0–Y17
M0–M799
T0–159
C0–C79
D0–D399
    
－
Use the LD command for contact A starting at the left busbar or contact A starting at a
contact circuit block; its function is to save current content and save the acquired
contact status in the cumulative register.
Ladder diagram:
X0
X1
Y1
Command code:
Description:
LD X0 Load Contact A of X0
AND X1
Create a series
connection to contact A
of X1
OUT Y1 Drive Y1 coil
Command
Function
LDI
Load contact B
Operand
X0–X17
Y0–Y17
M0–M799
T0–159
C0–C79
D0–D399
    
－
Use the LDI command for contact B starting at the left busbar or contact B starting at
a contact circuit block; its function is to save current content and save the acquired
contact status in the cumulative register.
Ladder diagram:
X0
X1
Y1
Command code:
Description:
LDI X0 Load Contact B of X0
AND X1
Create a series
connection to contact A
of X1
OUT Y1 Drive Y1 coil
Command
Function
AND
Connect contact A in series
Operand
X0–X17
Y0–Y17
M0–M799
T0–159
C0–C79
D0–D399
    
－
Use the AND command to create a series connection to contact A; its function is to first
read the current status of the designated series contact and the
logical operation
results before contact in order to perform “AND” operation; saves the results in
the
cumulative register.
Ladder diagram:
X1
X0
Y1
Command code:
Description:
LDI
X1
Load Contact B of X1
AND X0
Create a series
connection to contact A
of X0
OUT
Y1
Drive Y1 coil