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FX3U Series Programmable Controllers
10 Input Wiring Procedures (Input Interruption and Pulse Catch)
User’s Manual - Hardware Edition
1
Pulse Catch (M8170 to M8177)
The PLC (main unit) is provided with a pulse catch function and has 8 pulse catch input points.
→ For details on programming, refer to the programming manual.
10.5.1 Allocation of special memories to Iinput numbers (ON duration of input signals)
M8170
X001
M8171
X002
M8172
X003
M8173
X004
M8174
X005
M8175
X006
M8176
X007
M8177
ON duration of input signal
3
5µs or more
Product
Introduction
Contact on sequence program
X000
2
Features and
Part Names
Input No.
Introduction
10.5
10.5 Pulse Catch (M8170 to M8177)
50µs or more
4
Specifications
10.5.2 Cautions for pulse catch
1. Non-overlap of input numbers
Example:
When the pulse catch input contact M8170 is used, X000 is occupied. Therefore, it is impossible to use C235,
C241, C244, C246, C247, C249, C252 and C254, input interruption (including delay interruption) pointers
I000 and I001 and SPD, ZRN, DSZR and DVIT instructions at the same time.
• The wiring length should be 5 m (16’4") or less.
• Connect a bleeder resistance of 1.5kΩ (1 W or more) to the input terminal, so that the sum of the load
current of the open collector transistor output on the other side device and the input current of the main
body is 20 mA or more.
6
System
Configuration
2. Cautions in wiring
5
Version and
Peripheral
Devices
The input terminals X000 to X007 can be used for high-speed counter, input interruption, pulse catch, speed
detection (SPD) instructions and general-purpose input.
Take care not to overlap the input numbers.
7
Input/Output
Nos., Unit Nos.
8
Installation
9
Preparation and
Power Supply
Wiring
10
Input Wiring
179