Checking The Connection Status (Line Test) - Mitsubishi MELSEC-Q Series User Manual

7 PROCEDURE BEFORE STARTING THE DATA LINK

7.8 Checking the Connection Status (Line Test)

7 - 15
After connecting all of the modules with CC-Link dedicated cables, verify that they are
correctly connected and that data linking can be performed with remote stations, local
stations, intelligent device stations and the standby master station.
Line test 1 checks the status of communication with all modules that have been connected.
Line test 2 checks the status of communication with specific modules.
Neither line test 1 nor line test 2 requires parameter settings.
POINT
(1) Line test 2 is performed when an error is generated by line test 1.
Thus, if the result of line test 1 is normal, there is no need to conduct line test 2.
(2) Line test 2 cannot be performed on the standby master station.
(1) Checking the connection status and the status of communication with remote
stations/local stations/intelligent device stations/standby master station (line test 1)
Perform the line test according to the following procedure.
Check items prior to executing line test 1:
Verify that the CPU RUN/STOP switch is set
to "STOP".
Verify that the CPU RESET switch is set to
the "Middle position".
Set the "station number setting switch" for the
master/local module to "0".
Set the "transmission rate/mode setting
switch" for the master/local module to "5 to 9
(the transmission rate should be the same as
when the system is operating)".
Operate the CPU RESET switch according to
the following procedure.
1) Set the RESET switch to RESET.
RESET
2) Set the RESET switch to the middle position.
RESET
Start
L.CLR
L.CLR
To the next page
MELSEC-Q
7 - 15