Mitsubishi FX3U-16CCL-M User Manual

6 Introduction of Functions
6.3 RAS Function
57
FX3U-16CCL-M User's Manual
1
Introduction
2
Specification
3
System Configuration
4
Installation
5
Wiring
6
Introduction of Functions
7
Data Link Processing Time
8
Parameter Setting
9
Data Link Procedure
10
Buffer Memory
6.3 RAS Function
The term "RAS" stands for "reliability, availability and serviceability", and refers to the total operability of an
automated facility.
6.3.1 Slave station cutoff function
This function cuts off only remote stations and intelligent device stations in which data link is disabled by
power OFF, etc., and continues the data link using only normal remote stations and intelligent device stations.
No setting is required.
Caution
When a cable is broken, the data link is disabled in the entire system because terminal resistors do not
function any more.
6.3.2 Automatic return function
This function allows a module which was disconnected from the data link by power OFF, etc. to automatically
join the data link again when it recovers the normal status.
1. Setting method
Set the operation status to the parameter information area "Number of automatic return units (BFM#3)" in the
buffer memory in the master station.
Set the number of remote stations and intelligent device stations that can return to the system during one link
scan. The setting range is "1 to 10 (units)".
6.3.3 Data link status setting against error in master station PLC
This function sets the data link status for a case in which an operation stop error occurs in the master station
PLC.
1. Setting method
Set the operation status to the parameter information area "Operation specification when CPU is down
(BFM#6)" in the buffer memory in the master station.
0: Stop
1: Continue
Caution
Even if an operation continue error occurs in the master station PLC, the data link continues.
Master
station
Remote I/O
station
Remote device
station
Down
Intelligent
device
station
Intelligent
device
station
Terminal resistor Terminal resistor
Continues data link excluding the down station.
Master
station
Remote I/O
station
Remote device
station
Down
Intelligent
device
station
Intelligent
device
station
Terminal resistor Terminal resistor
Wire breakage

Mitsubishi FX3U-16CCL-M Specifications

General

Brand	Mitsubishi
Model	FX3U-16CCL-M
Category	Controller
Language	English