Automationdirect.com DL05 - Store Positive Differential (STRPD); Store Negative Differential (STRND)

Standard
RLL Instructions
5–15
Standard RLL Instructions
Boolean Instructions
The Store Positive Differential instruction
begins a new rung or an additional branch
in a rung with a normally open contact.
The contact closes for one CPU scan
when the state of the associated image
register point makes an Off-to-On
transition. Thereafter, the contact remains
open until the next Off-to-On transition
(the symbol inside the contact represents
the transition). This function is sometimes
called a “one-shot”.
Aaaa
The Store Negative Differential instruction
begins a new rung or an additional branch
in a rung with a normally closed contact.
The contact closes for one CPU scan
when the state of the associated image
register point makes an On-to-Off
transition. Thereafter, the contact remains
open until the next On-to-Off transition
(the symbol inside the contact represents
the transition).
Aaaa
Operand Data Type DL05 Range
A aaa
Inputs X 0–377
Outputs Y 0–377
Control Relays C 0–777
Stage S 0–377
Timer T 0–177
Counter CT 0–177
In the following example, each time X1 is makes an Off-to-On transition, Y4 will
energize for one scan.
Y4
OUT
DirectSOFT
X1
STR
$
CV
P
ENT
OUT
GX
3
D
SHFT
1
B
ENT
Handheld Programmer Keystrokes
4
E
In the following example, each time X1 is makes an On-to-Off transition, Y4 will
energize for one scan.
Y4
OUT
DirectSOFT
X1
STR
$
TMR
N
ENT
OUT
GX
3
D
SHFT
1
B
ENT
Handheld Programmer Keystrokes
4
E
Store Positive
Differential
(STRPD)
Store Negative
Differential
(STRND)