Mitsubishi Electric MELSEC FX3U - Counter [C]; Numbers of Counters; Features of Counters

103
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.
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