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Function of the counter
Each time the input switches from OFF to ON, the value of the counter increases by one increment. When
the value of the counter matches the setting value, the output coil is ON. Users can use either the decimal
constant or the value in the data register as the setting value.
16-bit counter:
1.
Setting range: 0~32,767 (The setting values 0 and 1 mean the same thing in that the output contact is ON
when the counter counts for the first time.)
2.
For the general-purpose counter, the current value of the counter is cleared when there is a power cut. If
the counter is the latched one, the current value of the counter and the state of the contact before the
power cut will be retained. The latched counter counts from the current value when the power supply is
restored.
3.
If users use the instruction MOV or ISPSoft to transmit a value bigger than the setting value to the current
value register C0, the contact of the counter C0 will be ON and the current value will become the same as
the setting value next time X0.1 is switched from OFF to ON.
4.
Users can use either the constant or the value in the register as the setting value of the counter.
5.
The setting value of the counter can be a positive or a negative. If the counter counts up from 32,767, the
next current value becomes -32,768.
5.2.11 32-bit Counters
Characteristics of the 32-bit counter
Item
Type
Number
Direction
setting value
Specification of the setting value
Change of the current value
Output contact
Reset
Action of the contact
32-bit general-purpose addition/subtraction counter
1.
Setting range: -2,147,483,648~2,147,483,647
2.
The switch between the 32-bit general-purpose addition counters and the 32-bit general-purpose
subtraction counters depends on the states of the special auxiliary relays SM621~SM684. For
example, the counter HC0 is the addition counter when SM621 is OFF, whereas HC0 is the
subtraction counter when SM621 is ON.
3.
Users can use either the constant or the value in the data registers as the setting value of the counter,
and the setting value can be a positive or a negative. If users use the value in the data registers as the
setting value of the counter, the setting value occupies two consecutive registers.
4.
For the general-purpose counter, the current value of the counter is cleared when there is a power cut.
If the counter is the latched one, the current value of the counter and the state of the contact before
the power cut will be retained. The latched counter counts from the current value when the power
supply is restored.
5.
If the counter counts up from 2,147,483,647, the next current value becomes -2,147,483,648. If the
counter counts down from -2,147,483,648, the next current value becomes 2,147,483,647.
32-bit counter
General type
HC0~HC63
Counting up/down
-2,147,483,648~+2,147,483,647
The setting value can be either the constant or the value
occupying two data registers.
The counter keeps counting after the value of the counter
matches the setting value.
The contact is ON when the value of the addition counter
matches the setting value.
The contact is reset to OFF when the value of the subtraction
counter matches the setting value.
When the instruction RST is executed, the current value is
cleared to zero, and the contact is reset of OFF.
After the scan is complete, the contact acts.
C h a p t e r 5 D e v i c e
5 - 9
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