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7 Assignment of Input/Output Numbers and Unit Numbers
7.2 Unit Numbers of Special Function Blocks
93
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
1
Introduction
2
Features and
Part Names
3
Product
Introduction
4
Specifications
5
Version and
Peripheral
Devices
6
System
Configuration
7
Input/Output
Nos., Unit Nos.
8
Installation
9
Preparation and
Power Supply
Wiring
10
Input Wiring
7.2 Unit Numbers of Special Function Blocks
7.2.1 Concept of assigning
When power is turned on, the main unit (CPU) automatically assigns the numbers 0 to 7 to special function
blocks starting from the one closest to the main unit.
Unit numbers are not given to input/output powered extension units/blocks.
1. Special function blocks connected to main unit
The numbers 0 to 7 are assigned to the special function blocks starting from the one closest to the main unit.
2. Products to which unit numbers are not assigned
• Input/output powered extension units: FX2N-32ER, FX2N-48ET, etc.
• Input/output extension blocks: FX
2N-16EX, FX2N-16EYR, etc.
• Connector conversion adapter: FX
3G-CNV-ADP, FX2N-CNV-BC
• Expansion boards: FX
3G-232-BD, etc.
• Special adapters: FX
3U-232ADP(-MB), FX3U-4AD-ADP, etc.
• Extension power supply unit: FX
3U-1PSU-5V
7.2.2 Example of assigning
Unit numbers are assigned to the special function blocks in the following configuration.
→ For assignment of input/output numbers, refer to Section 7.1.
1. Example of configuration
2. Assignment of Unit No.
Unit numbers are assigned to the special function blocks in the above configuration as shown below.
Input/output
powered
extension unit
FX
2N-32ET
Input
extension
block
FX
2N-8EX
Special function
block
FX
2N-16CCL-M
Main unit
FX
3G-24MT/ES
Special
function
block
FX
3U-64CCL
Connector
conversion
adapter
FX
3G-CNV-ADP
Special adapter
FX
3U-4AD-ADP
Input/output
powered
extension unit
FX
2N-32ET
Input
extension
block
FX
2N-8EX
Special function
block
FX
2N-16CCL-M
Main unit
FX
3G-24MT/ES
No.0
Unit No.
No.1
Unit No.
Connector
conversion
adapter
FX
3G-CNV-ADP
Special adapter
FX
3U-4AD-ADP
Special
function
block
FX
3U-64CCL