Chapter 5 Relay Ladder Logic Programming 69
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2BSpecialty Elements
General
output
SET
output
RESET
output
PULSE
output
N.O.
contact
N.C.
contact
Number
Symbol [
¿ À
P
(N.O./N.C.)
Lo Hi Used in function block
Expansion input coil X x 12(X01-X0C/x01-x0C)
Expansion output coil Y Y Y Y Y y 12(Y01-Y0C/y01-y0C)
Edge trigger
(pulse output)
D d
RTC R R r 31(R01-R1F/r01-r1F)
Analog comparator G G g 31(G01-G1F/g01-g1F)
HMI H 31(H01-H1F)
PWM P 2(P01-P02)
IO LINK L 8(L01-L08)
SHIFT S 1(S01)
Positive Edge Trigger - Pulse Output ( D )
A positive edge trigger (D) holds its status ON for one CPU scan time when the preceding series contact changes
its state from OFF to ON. The transition from OFF to ON is called the “Positive Edge Trigger”.
Negative Edge Trigger - Pulse Output ( d )
A negative edge trigger (d) holds its status ON for one CPU scan time when the preceding series contact changes
its state from ON to OFF. The transition from ON to OFF is called the “Negative Edge Trigger”.
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