AEG Modicon Micro 84 - Cascading Timers and Counters; Arithmetic Operations; Interconnecting Timers; Time-Of-Day Clock

7.6.4 Cascading Timers and Counters
Timers and counters can be interconnected or cascaded to satisfy any
required logic. As many timers and counters as necessary can be placed
within a network limited only by the 4 x 7 logic element format.
Two timers (or counters) can be placed in series (interconnected) by using
output 1 of one timer as input 1 to a second timer. These two timers allow
twice as much time to be measured; they are cumulative in effect.
START
it-
900 -
900
IOr
RESET
TI.0
Tl.O
I
IU
. 4001
. 4002
Figure 7-5. Interconnecting Timers
Timers and counters can also be cascaded to, in effect, multiply their
range. Figure 7-6 illustrates a timer/counter network that produces a time-
of-day clock measuring time in hours and minutes.
TENTHS OFA
START
it-
SECOND MINUTES
1
t
1
600 60
P
0002
TO. I
0001
CTR
4001 XI . 4002 I
XI
0002
0003
HOURS
24
---P
CTR
0003
4003
I
I
I
NOTE
For greater long-term accuracy, adjust timer between 598
and 602 using an accurate clock.
Figure 7-6. Time-of-Day Clock
7.6.5 Arithmetic Operations
The arithmetic operations consist of addition and subtraction.
The format of the arithmetic operations is shown below:
ARITHMETIC
IN
PRESET
OUTPUT I
(nnn ,3~,4OXX)
REGISTER
40Xx
- OUTPUT2
RE=S”LT
(40xX+1)
7-8
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