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4 FUNCTIONS
MELSEC-QnA
4
4. FUNCTIONS
This chapter describes the functions.
4.1 Function List
The function list is shown in Table 4.1.
Table 4.1 Function list
Function
availability
Item Function summary Reference
Master
station
Local
station
Communication between master and
remote I/O stations
Performs on/off data communication with remote I/O station. Section 4.2
Communication between master and
remote device stations
Performs on/off data and numeric data communication with
remote device station.
Section 4.3
Communication between master and local
stations
Performs on/off data and numeric data communication with
local station.
Section 4.4
Communication with compound system
Performs communication with remote I/O, remote device and
local stations.
Section 4.5
Reserved station function
By setting the remote and local stations planned to be
connected in the future as reserved stations, these stations will
not be treated as error. When specified to an already connected
module, data link cannot be performed at all.
Section 4.6
Error invalid station function
Remote and local stations that can no longer perform data link
due to power off, etc., will not be treated as data-link faulty
stations.
Section 4.7
Data-link status setting when a master
station programmable controller CPU error
occurs
Data-link status can be set when an operation-stop error occurs
with the master station programmable controller CPU.
Section 4.8
Parameter registration to E
2
PROM
By registering the parameters in the master module's E
2
PROM,
the parameters do not have to be written every time the master
module is started up.
Section 6.1
Input data from a data-link faulty station
status setting
The status (clear/store) of the input (received) data from the
data-link faulty station caused by power off, etc. can be set.
Section 4.9
Module reset function from a sequence
program
When the switch setting is changed or an error occurred with
the module, the module can be reset from the sequence
program instead of resetting the programmable controller CPU.
Section 4.10
Data link stop/restart
When executing the data link from Yn6 or Yn8, the data link can
be stopped or restarted.
Section 4.11
Automatic return function
When the module removed from the data link due to power off,
etc. recovers to normal status, the module automatically joins
the data link.
Section
4.12.1
Slave station cutoff function
The module which no longer can continue the data link due to
power off, etc. is removed from the data link, and the data link is
continued with only the normal modules.
Section
4.12.2
Data link status check
(SB/SW)
The data link status can be checked. Can be used for sequence
program interlocking, etc.
Section 8.3
Offline test
The following tests can be conducted:
• Hardware test...........................Operation check for the
individual module
• Line test....................................Module connection condition
check
• Parameter verification test........Verify the set parameter
contents
Section 7.4
Section 7.7
Section 7.8
Online test*
Line tests and link control, such as start and stop are available
from peripheral devices.
Section
15.10
RAS function
Monitor/diagnosis
Monitoring and diagnosing are available from peripheral
devices.
Section
15.11