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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.6 Counter [C]
4.6 Counter [C]
4.6.1 Numbers of counters
The table below shows counter (C) numbers. (Numbers are assigned in decimal.)
1. FX3S PLC
→ For high-speed counters, refer to Section 4.7.
2. FX3G/FX3GC PLCs
→ For high-speed counters, refer to Section 4.7.
3. FX3U/FX3UC PLCs
→ For high-speed counters, refer to Section 4.8.
*1. This area is not latched (battery backed). It can be changed to a latched (battery backed) area by setting the
parameters.
*2. This area is latched (battery backed). It can be changed to a non-latched (non-battery-backed) area by setting
the parameters.
Counter numbers not used as counters can be converted as data registers for storing numeric values.
4.6.2 Features of counters
The table below shows the features of 16-bit counters and 32-bit counters. They can be used in accordance with the
operating condition such as the counting direction switching and counting range, etc.
16-bit up counter
Counting range: 0 to 32767
32-bit bi-directional counter
Counting range: −2,147,483,648 to +2,147,483,647
General type Fixed latched (EEPROM keep) type General type
C0 to C15
16 points
C16 to C31
16 points
C200 to C234
35 points
16-bit up counter
Counting range: 0 to 32767
32-bit bi-directional counter
Counting range: −2,147,483,648 to +2,147,483,647
General type Fixed latched (EEPROM keep) type General type Fixed latched (EEPROM keep) type
C0 to C15
16 points
C16 to C199
184 points
C200 to C219
20 points
C220 to C234
15 points
16-bit up counter
Counting range: 0 to 32767
32-bit bi-directional counter
Counting range: −2,147,483,648 to +2,147,483,647
General type
Latched (battery backed)
type (protected by battery against
power failure)
General type
Latched (battery backed)
type (protected by battery against
power failure)
C0 to C99
100 points
*1
C100 to C199
100 points
*2
C200 to C219
20 points
*1
C220 to C234
15 points
*2
Item 16-bit counter 32-bit counter
Counting direction Up-counting
Up-counting and down-counting can be switched (as
shown in Subsection 4.6.3)
Set value 1 to 32767 −2,147,483,648 to +2,147,483,647
Set value specification Constant (K) or data register Constant (K) or a pair of data registers
Current value change Does not change after counting up Changes even after counting up (ring counter)
Output contact Latches after counting up Latches (in up-counting), or reset (in down-counting)
Reset operation When RST instruction is executed, current value of counter is reset to "0" and output contact returns
Current value register 16 bits 32 bits