Automationdirect.com DirectLOGIC DL205 Series User Manual page 237

Chapter 5: Standard RLL Instructions - Boolean
Positive Differential (PD)
1
The Positive Differential instruction is typically
230
known as a one shot. When the input logic
240
produces an off to on transition, the output will
2
250-1
energize for one CPU scan.
260
3
Operand Data Type
4
Inputs
5
Outputs
Control Relays
6
In the following example, every time X1 makes an off to on transition, C0 will energize for
7
one scan.
DS Used
8
HPP Used
DirectSOFT
9
X1
10
11
12
NOTE: To generate a "one–shot" pulse on an on–to–off transition, place a NOT instruction immediately
before the PD instruction. The DL250–1 and DL260 CPUs support the STRND instruction.
13
14
A
B
C
D
5–20
DL205 User Manual, 4th Edition, Rev. B
DL230 Range DL240 Range DL250-1 Range DL260 Range
A aaa
X 0–177 0–477
Y 0–177 0–477
C 0–377 0–377
Handheld Programmer Keystrokes
$
C0
STR
PD
SHFT
A aaa
aaa aaa
0–777
0–777
0–1777
B
ENT
1
P D
SHFT
CV 3
PD
aaa
0–1777
0–1777
0–3777
A
ENT
0