92
Because in this example the SV for CNT 01 is 100 and the SV for CNT 02 is
200, the completion flag for CNT 02 turns ON when 100 x 200 or 20,000 OFF
to ON changes have been counted in 0001. This would result in 0203 being
turned ON.
0203
CP
R
CNT 01
#0100
CP
R
CNT 02
#0200
CNT 01
0002
CNT 02
0000
0001
0002
CNT 01
CNT 02
Address
Instruction
Operands
0000
LD
0000
0001
AND
0001
0002
LD NOT
0002
0003
OR
CNT
01
0004
OR
CNT
02
0005
CNT
01
#
0100
0006
LD
CNT
01
0007
LD NOT
0002
0008
CNT
02
#
0200
0009
LD
CNT
02
0010
OUT
0203
CNT can be used in sequence as many times as required to produce count-
ers capable of counting down even higher values.
CNT can be used to create extended timers in two ways: by combining TIM
with CNT and by counting SR area clock pulse bits.
In the following example, CNT 02 counts the number of times TIM 01
reaches zero from its SV. The completion flag for TIM 01 is used to reset TIM
01 so that is runs continuously and CNT 02 counts the number of times the
completion flag for TIM 01 goes ON (CNT 02 would be executed once each
time between when the completion flag for TIM 01 goes ON and TIM 01 is
reset by its completion flag). TIM 01 is also reset by the completion flag for
CNT 02 so that the extended timer would not start again until CNT 02 was
reset by 0001, which serves as the reset for the entire extended timer.
As the SV for TIM 01 is 5.0 seconds and the SV for CNT 02 is 100, the com-
pletion flag for CNT 02 turns ON when 5 seconds x 100 times, or 8 minutes
and 20 seconds have expired. This would result in 0201 being turned ON.
0000
TIM 01
CNT 02
TIM 01
0001
CNT 02
0200
CP
R
CNT 02
#0100
Address
Instruction
Operands
0000
LD
0000
0001
AND NOT
TIM
01
0002
AND NOT
CNT
02
0003
TIM
01
#
0050
0004
LD
TIM
01
0005
LD
0001
0006
CNT
02
#
0100
0007
LD
CNT
02
0008
OUT
0200
TIM 01
#0050
In the following example, CNT 01 counts the number of times the 1-second
clock pulse bit (1902) goes from OFF to ON. Here again, 0000 is used to
control when CNT is operating.
Example 3:
Extended Timers
Timer and Counter Instructions
Section 5-11
Summary of Contents for SYSMAC C20K
Page 1: ...Cat No W146 E1 5 Programmable Controllers SYSMAC C20K C28K C40K C60K ...
Page 2: ...K type Programmable Controllers OPERATION MANUAL Revised July 1999 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 19: ...7 SECTION 2 Hardware Considerations 2 1 Introduction 2 2 Indicators 2 3 PC Configuration ...