Mitsubishi FX3UC Series - Page 157

151
FX3UC Series Programmable Controllers
User’s Manual - Hardware Edition
5 Input Specifications and External wiring
5.5 High-speed Counters (C235 to C255)
1
Outline
2
External Dimensions
3
Generic Specifications
4
Power Supply Specifications
5
Input Specifications
6
Output Specifications
7
Examples of Wiring for Various Uses
8
Terminal Block
9
CC-Link/LT Master FX
3UC
(LT only)
10
Display module FX
3UC
(LT only)
5.5 High-speed Counters (C235 to C255)
5.5.1 High-speed counter type and device number
1. High speed counter type
The main unit has built-in 32-bit high speed bi-directional counters (1-phase 1-count input, 1-phase 2-count
input and 2-phase 2-count input). These high-speed counters are classified into hardware counters and
software counters according to counting method.
For some high-speed counters, external reset input terminals or external start input terminals (start of
counting) can be selected.
2. Classification according to counting method
• Hardware counters: Counting by hardware.
May be switched to software counters depending on the operating condition.
→ For the conditions under which they are handled as software counter,
refer to Subsection 5.5.8.
• Software counters: Counting through interrupt handling by CPU
Each counter must be used within specific limitations on maximum response
frequency and overall frequency.
→ For the restriction in response frequency by the overall frequency,
refer to Subsection 5.5.9.
3. High speed counter type and input signal form
The types and input signals (waveforms) of high-speed counters (1-phase 1-count input, 1-phase 2-count
input and 2-phase 2-count input) are shown below.
4. Cautions in connecting mating device
High speed counter inputs use general-purpose input terminals X000 to X007. Open collector transistor (24V
DC) output type equipment can be connected, but equipment having the output type shown below cannot be
connected.
Absolute encoders cannot be connected to high-speed counter inputs because the signal type is different.
→ For wiring, refer to "Section 7.2 Rotary Encoder [High-speed Counters C235 to C255]".
→ For programming, refer to programming manual.
Type of counter Input signal form Counting direction
1-phase 1-count
input
Down-count or up-count is specified by turning on
or off M8235 to M8245.
ON: Down-counting
OFF: Up-counting
1-phase 2-count
input
Up-count or down-count
The counting direction can be checked with
M8246 to M8250.
ON: Down-counting
OFF: Up-counting
2-phase
2-count
input
1 edge
count
Automatic up-count or down-count according to
change in input status of phase A/B
The counting direction can be checked with
M8251 to M8255.
ON: Down-counting
OFF: Up-counting
4 edge
count
Output type disabling direct
connection
Voltage output type
Line driver output type
Open collector output type that does not support 24V DC
UP/
DOWN
UP
DOWN
+1 +1
-1 -1
Phase A
Phase B
+1
+1
Up-counting
-1
-1
Down-counting
Phase A
Phase B
+1
Up-counting
+1 +1 +1 +1
+1 +1 +1 +1
-1
Down-counting
-1 -1 -1 -1
-1 -1 -1 -1