Eaton ELC-PB, Programming Manual

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E L C P r o g r a m m i n g M a n u a l
F o r m o r e i nf o r m a t i o n v i sit :
w w w. e a t o n . c o m
MN05003003E
3-270
API Mnemonic Operands Function
90 LDP
S
Rising-edge Detection Operation
Bit Devices Word devices Program Steps
Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
S * * * * * *
LDP: 3 steps
ELC ELCB ELCM
PB PC/PA/PH PV PB PH/PA
32 16 P 32 16 P 32 16 P 32 16 P 32 16 P
Operands:
S
: Bit address
Description:
The LDP instruction is similar to the LD instruction, but LDP requires a false-to-true transition of
S
to
be energized for one program scan. Then, the state of
S
must go false, then true again to be
energized.
Program Example:
Ladder Diagram:
X0 X1
Y1
Instruction: Operation:
LDP X0
; Start X0 rising-edge detection
AND X1 ; Series connection A contact of X1
OUT Y1 ; Drive Y1 coil
Points to Note:
1. If a specific rising-edge contact state is ON before the ELC is powered, the rising-edge contact
will be True after power is applied to the ELC
2. If X1 is ON and X0 transitions from OFF to ON, Y1 will be energized for one program scan,
then it will turn OFF. Y1 will not turn on again until X0 goes OFF, then ON again. .