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Creating Step Ladder Program Instructions
3-7-4 Step Ladder Instructions
Command
Icon
LOAD
LOAD
NOT
AND
AND
NOT
OR
OR NOT
AND
logic block
logic block
LOAD
OR LOAD
logic block
logic block
OUT
OUT NOT
2. Select the LCU/LCB element, and select Cross-Reference from the Execu-
tion Menu. The following screen will appear.
Select
Operand
Mode
menu
menu
LOAD
Read source
Indicates a logical start of the logic block,
block ad-
creates an ON/OFF execution condition based
dress/ITEM
on the ON/OFF status of the contact, and con-
number
nects to the next stage.
LOAD
Read source
Indicates a logical start of the logic block,
NOT
block ad-
creates an ON/OFF execution condition based
dress/ITEM
on the reverse of the ON/OFF status of the
number
contact, and connects to the next stage.
LOAD
Read source
Takes a logical AND of the status of the contact
block ad-
and the current execution condition.
dress/ITEM
number
LOAD
Read source
Reverses the status of the contact and takes a
NOT
block ad-
logical AND with the current execution condi-
dress/ITEM
tion.
number
Draw Line
Read source
Takes a logical OR of the status of the contact
block ad-
and the current execution condition.
dress/ITEM
number
Draw Line
Read source
Reverses the status of the contact and takes a
block ad-
logical OR with the current execution condition.
dress/ITEM
number
Draw Line
000000
Takes a logical AND between circuit blocks.
(fixed)
Draw Line
000000
Takes a logical OR between circuit blocks.
(fixed)
OUT
Write des-
Outputs the result (execution condition) of log-
tination
ical processing: 0 (OFF) at condition 0 (OFF),
block ad-
and 1 (ON) at condition 1 (ON).
dress/ITEM
number
OUT NOT
Write des-
Outputs the result (execution condition) of log-
tination
ical processing: 1 (ON) at condition 0 (OFF),
block ad-
and 0 (OFF) at condition 1 (ON).
dress/ITEM
number
Description
Section
3-7
O: Can be used
–: Cannot be used
In logic se-
In step se-
quence
quence
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
191
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