X8 Instruction Set Reference Manual
7-6
Relay-Type (Bit) Instructions
ONSR - One Shot Rising
ONSF - One Shot Falling
Instruction Type: input
Use the ONSR and ONSF instructions to trigger an event to occur one time.
These instructions trigger an event based on a change of rung state, as follows:
• Use the OSR instruction when an event must start based on the false-to-true
(rising edge) change of state of the rung.
• Use the OSF instruction when an event must start based on the true-to-false
(falling edge) change of state of the rung.
These instructions use two parameters.
• Storage Bit: this is the bit address that store the rung state from the previous
scan.
• Output Bit: this is the bit address which is set based on a false-to-true (ONSR)
or true-to-false (ONSF) rung transition.
To re-activate the ONSR or ONSF instructions, the rung must become TRUE
or FALSE.
Parameter
Data Table
SFR
Address
Mode
Address
Level
Y
X
SR
B
TM
, CT
, CR
N
F
ST
A
L
MG, PD
RP
PS
ASCI
I
RTC
HSC
PT
O
, P
W
M
STI
EI
I
BHI
MMI
CS-C
om
ms
DLS-Data
Lo
g
Immediate
Direct
Indirect
Bit
Wo
rd
Lon
gW
ord
El
emen
t
Bit
√
√
√
√
√
ONSR Instruction Table
Rung Transition
Storage Bit
Rung State after
Execution
FALSE to TRUE (1 Scan)
Bit
Bit
TRUE to TRUE
Bit
Bit
TRUE to TRUE
FALSE to FALSE
Bit
Bit
ONSR
EN
ENO
Storage Bit
B3.0.8 -
Output Bit - Y0.0.0.3
ONSF
EN
ENO
Storage Bit
B3.0.9 -
Output Bit - Y0.0.0.4
Summary of Contents for X8 Series
Page 1: ...Catalog Number s X8 M14DDT X8 M16DDR X8 M32DDT X8 Instruction Manual Reference Manual ...
Page 16: ......
Page 64: ...X8 Instruction Set Reference Manual 2 12 X8 Series PLC Memory and Data Table ...
Page 166: ...X8 Instruction Set Reference Manual 7 8 Relay Type Bit Instructions ...
Page 180: ...X8 Instruction Set Reference Manual 8 14 Timer and Counter Instructions ...
Page 205: ...X8 Instruction Set Reference Manual Math Instructions 10 17 ...
Page 206: ...X8 Instruction Set Reference Manual 10 18 Math Instructions ...
Page 212: ...X8 Instruction Set Reference Manual 11 6 Converion Instructions ...
Page 218: ...X8 Instruction Set Reference Manual 12 6 Logical Instructions ...
Page 236: ...X8 Instruction Set Reference Manual 15 8 Shift and FIFO LIFO Instructions ...
Page 242: ...X8 Instruction Set Reference Manual 16 6 Sequencing Instructions ...
Page 252: ...X8 Instruction Set Reference Manual 18 4 Input and Output Instructions ...
Page 280: ...X8 Instruction Set Reference Manual 20 12 PID Control ...
Page 296: ...X8 Instruction Set Reference Manual 21 16 ASCII Instructions ...
Page 308: ...X8 Instruction Set Reference Manual 22 12 Communications Instructions ...
Page 312: ...Appendix A 4 System Error Code ...
Page 313: ...Appendix B MSG Instruction Error Code MSG Instruction Error Code ...
Page 322: ...Appendix B 10 MSG Instruction Error Code ...
Page 325: ...ASCII Character Set Appendix C 3 ...
Page 326: ...Publication number X8 RM001A EN September 2012 ...
Page 327: ...Copyright 2012 RS Automation Co Ltd All rights reserved ...