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App. - 24

 

 

 
Appendix 4.16    Measuring operation time 

Setting an operation time to a control target is useful for judging the timing of a 

component replacement and lubrication. The timer ST and data register D must 

have a backup power source so that they can continue operating at a power failure. 

With the contents of D31 (in one hour units) displayed externally, the program can 

work as an operation timer. 

 

Project name 

QA-23 

Program name 

MAIN 

 

ST250

X2

ST250

0

5

Measures in 
1 hour units

6-minute timer

Indicates timing 
to replace

K3600

D30

K0

MOV

ST250

RST

D30

K1

+

D31

K1

+

K4Y60

D31

BCD

D30

K10

=

SM400 (always ON)

21

D31

K1000

<=

25

Y70

1-hour timer

Outputs operation 
time to exterior

The management time is set to 100 hours.

 

 

 

Appendix 4.17    Measuring cycle time 

Measuring the operation time of a control target (from its start to end) allows 

displaying the cycle time-out and managing a control time lag. 

The following ladder in which the <, >, and = instructions are used to determine the 

state of T200 indicates a cycle time-out and measures a time lag with the counter. 

 

Project name 

QA-24 

Program name 

MAIN 

 

M56

X0

M56

0

4

Measures cycle time

In cycle

X1

M56

T200

X7

24

T200

K32760

Y70

SET

10

T200

K400

<

14

T200

K300

<

T200

K400

>=

C10

K32760

Y70

RST

C10

RST

Cycle time run out

Number of cycle times 
of 3.01 to 4.00sec.

Clears time out display 
and accumulated counts