DL205 User Manual, 4th Edition, Rev. D
5-21
Chapter 5: Standard RLL Instructions
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A
B
C
D
Store Positive Differential (STRPD)
The Store Positive Differential instruction begins a
new rung or an additional branch in a rung with a
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.” ‘This contact will also close on a program-to-run transition if it is within a retentive range
and on before the PLC mode transition.
Store Negative Differential (STRND)
The Store Negative Differential instruction begins a
new rung or an additional branch in a rung with a
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).
In the following example, each time X1 is makes an off-to-on transition, Y4 will energize for one scan.
In the following example, each time X1 makes an on-to-off transition, Y4 will energize for one
scan.
Aaaa
Aaaa
Operand Data Type DL250-1 Range DL260 Range
A
aaa aaa
Inputs X 0–777 0–1777
Outputs Y 0–777 0–1777
Control Relays C 0–1777 0–3777
Stage S 0–1777 0–1777
Timer T 0–377 0–377
Counter CT 0–177 0–377
Global GX – 0–3777
Global GY – 0–3777
Y4
OUT
DirectSOFT
X1
STR
$
CV
P
ENT
OUT
GX
3
D
SHFT
1
B
ENT
Handheld Programmer Keystrokes
4
E
Y4
OUT
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