Delta AH500 - 5.2.10 Counters

Chapter 5 Devices and Assigning Addresses
5-9
the timer becomes the accumulative timer. When the conditional contact is OFF, the value of the
accumulative timer is not reset. When the conditional contact is ON, the timer counts from the current
value.
 Timer used in the function block
T1920~T2047 are the timers which users can use in the functional block or the interrupt.
When the instruction TMR or END is executed, the timer used in the functional block begins to count. As
the value of the timer matches the setting value, the output coil is ON.
If the general-purpose timer is used in the functional block or the interrupt, and the functional is not
executed, the timer can not count correctly.
5.2.10 Counters
 Characteristics of the 16-bit counter
Item
16-bit counter
Type
General type
Number
C0~C2047
Direction
Counting up
Setting value
0~32,767
Specification of the setting value
The setting value can be either the constant or the value in the data
register.
Change of the current value
The counter stops counting when the value of the counter matches
the setting value.
Output contact
The contact is ON when the value of the counter matches the setting
value.
Reset
When the instruction RST is executed, the current value is cleared to
zero, and the contact is reset of OFF.
Action of the contact
After the scan is complete, the contact acts.
 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.