Automationdirect.com DirectLOGIC DL205 Series

DL205 User Manual, 4th Edition, Rev. B
5–21
Chapter 5: Standard RLL Instructions - Boolean
1
2
3
4
5
6
7
8
9
10
11
12
13
14
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 retentative
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 is 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
DirectSOFT
X1
STR
$
TMR
N
ENT
OUT
GX
3
D
SHFT
1
B
ENT
Handheld Programmer Keystrokes
4
E
ý
ý
þ
þ
230
240
250-1
260
ý
ý
þ
þ
230
240
250-1
260
DS Used
HPP Used