Delta MS300 Series User Manual page 696

Functions of auxiliary relays
Like an output relay Y, an auxiliary relay M has an output coil and contacts A and B, and you can use
the output relay contacts any number of times in a program. You can use an auxiliary relay M to
configure the control circuit, but cannot use the auxiliary relay to directly drive an external load. There
are two types of auxiliary relays:
 Ordinary auxiliary relays:
Ordinary auxiliary relays all revert to the OFF state when a power outage occurs while the PLC is
running, and remains in the OFF state when power is restored.
 Special purpose auxiliary relays:
Each special purpose auxiliary relay has its own specific use. Do not use any undefined special
purpose auxiliary relays.
Timer functions
Timers use 100 ms as their timing unit. When the timing method is an upper time limit, and the current
timer value = setting value, the timer output coil is energized. Timer setting values use decimal K
values; you can also use the data register D as a setting value.
Actual timer setting time = timing units × set value
Counter features
Item
Type
CT Direction:
Setting
Designation of set value
Change in current value
Output contact
Reset
Contact actuation
Counter functions
When a counter's counting pulse input signal switches from OFF to ON, if the counter's current value
is equal to the setting value, the output coil switches ON. The setting value can be either a decimal K
or a data register D.
16-bit counter:
 16-bit counter setting range: K0–K32,767. When K0 and K1 are identical, the output contact is
immediately ON during the first count.
 The current counter value is cleared from an ordinary counter when power to the PLC turns OFF.
 If you use the MOV command or WPLSoft to transmit a value greater than the setting value to
the C0 current value register, when the next X1 switches from OFF to ON, the C0 counter
contact changes to ON, and the current value changes to the setting value.
 You can set a counter's setting value directly using a constant K, or indirectly using the value in
register D (not including special data registers D1000–D1199 or D2000–D2799).
General Type
Up
0–32,767
Constant K or data register D
When the count reaches the setting value, it stops counting.
When the count reaches the setting value, the contact switches ON and stays ON.
The current value reverts to 0 when an RST command is executed, and the
contact reverts to OFF.
All are actuated after the end of scanning.
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Chapter 16 PLC Function ApplicationsMS300
16-bit counter
Table 16-11