Eaton ELC-PB - Page 179

ELC Programming Manual
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3-10
Mnemonic Function Program steps
END
Program End 1
ELC ELCB ELCM
PB PC/PA/PH PV PB PH/PA
Description:
An END statement must be placed at the end of an ELC program. An ELC controller will scan from
program line 0 to the END statement, then return to line 0 again. .
Mnemonic Function Program steps
NOP
No operation 1
ELC ELCB ELCM
PB PC/PA/PH PV PB PH/PA
Description:
This is a no-operation command and has no effect on the operation of the line of code it’s in. NOP is
used to delete a command without changing the number of steps. (Overwrite with NOP)
Program Example:
X0
Y1
NOP
Command NOP will be omitted
when ladder diagram displays.
Instruction: Operation:
LD X0 ; Load A contact of X0
NOP
; No operation
OUT Y1 ; Drive Y1 coil
Mnemonic Function Program steps
NP
Negative contact to Positive contact 1
ELC ELCB ELCM
PB PC/PA/PH PV PB
PH/PA
Description:
When the conditions preceding NP command change from false to true, NP command (works as
contact A) will be ON for a scan cycle. In the next scan cycle it turns OFF.
Program Example:
M0 M1
Y0
P
Instruction: Operation:
LD M0 ; Load A contact of M0
AND M1 ; And A contact of M1
NP
; Negative contact to Positive contact
OUT Y0 ; Drive Y0 coil
Timing Diagram: