X8 Instruction Set Reference Manual
8-12
Timer and Counter Instructions
CTU - Count Up
CTD - Count Down
Instruction Type: output
The CTU and CTD instructions are used to increment or decrement a counter
at each false-to-true rung transition.
Parameter
Data Table
SFR
Address
Mode
Address
Level
Y
X
SR
B
TM,
CT
, CR
N
F
ST
A
L
MG,
P
D
RP
PS
RTC
HSC
PTO, PWM
STI
EII
BHI
MM
I
CS
-Co
m
ms
DL
S-Data
Lo
g
Immediate
Direct
Indirect
Bi
t
Wo
rd
Lo
ngW
or
d
Eleme
nt
Counter
√
√
√
Preset
√
√
ACC
√
√
TIP
If the signal that makes rung conditions go false-to-true is
coming from a field device, this signal should be maintained to
check rung status transition in case of that the width of ON/OFF
is less than the scan time.
CTU
EN
ENO
Counter
CT10.0 -
PRE
1000 -
ACC >0
CountUp
Done
CTU
EN
ENO
Counter
CT10.1 -
PRE
1000 <
ACC >0
CountDown
Done
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 ...