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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.6 Counter [C]
1
Introduction
2
Overview
3
Instruction
List
4
Devices
in Detail
5
Specified the
Device &
Constant
6
Before
Programming
7
Basic
Instruction
8
FNC00-FNC09
Program Flow
9
FNC10-FNC19
Move & Compare
10
FNC20-FNC29
Arith. & Logic
Operation
4.6 Counter [C]
4.6.1 Numbers of counters
The table below shows counter (C) numbers. (Numbers are assigned in decimal.)
→ For high speed counters, refer to Section 4.7.
1. FX3U/FX3UC PLC
2. FX
3G PLCs
*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.
4.6.3 Related devices (to specify counting direction) [32-bit counter]
When an auxiliary relay for switching the counting direction is set to ON, the counter executes down-counting, and
when set to OFF, the counter executes up-counting.
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
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 (EEPROM keep) type General type Latched (EEPROM keep) type
C0 to C15
16 points
C16 to C199
184 points
C200 to C219
20 points
C220 to C234
15 points
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
Counter No.
Counting
direction
switching
relay
Counter No.
Counting
direction
switching
relay
Counter No.
Counting
direction
switching
relay
Counter No.
Counting
direction
switching
relay
C200 M8200 C209 M8209 C218 M8218 C227 M8227
C201 M8201 C210 M8210 C219 M8219 C228 M8228
C202 M8202 C211 M8211 C220 M8220 C229 M8229
C203 M8203 C212 M8212 C221 M8221 C230 M8230
C204 M8204 C213 M8213 C222 M8222 C231 M8231
C205 M8205 C214 M8214 C223 M8223 C232 M8232
C206 M8206 C215 M8215 C224 M8224 C233 M8233
C207 M8207 C216 M8216 C225 M8225 C234 M8234
C208 M8208 C217 M8217 C226 M8226