Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 138

4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
Station to execute test (station No. n)
Set "Test between master station"
for the mode of station No. 1.
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(2) Setting the test mode
(a) Mode setting for the station-to-station test on a non-redundant system
station
Set the mode network parameters for station number n and station number
n + 1 to "Test between master station" and "Test between slave station"
respectively, and write the parameter settings to the CPU module.
(b) Mode setting for the station-to-station test in the redundant system
To perform the station-to-station test in the redundant system, set the
operation mode of the redundant CPU to backup mode.
If the power to both systems cannot be turned on or off, perform the station-
to-station test in separate mode.
The table below shows the mode settings available for the station-to-station
test in the redundant system.
Station performing the
test
Station not performing
the test
The following shows a case where a non-redundant system (station No. 1)
is set as a testing station and system A (station No. 2) of the redundant
system (in backup mode) is set as a tested station.
Q25H Station
CPU No. 1
Set "Test between slave station"
for the mode of system A (station No. 2).
Station to be tested (station No. n + 1)
Set
Set station
In backup mode
In separate mode
In backup mode
In separate mode
Control system
(system A)
Redundant Station
CPU No. 2
Set "Offline" for the mode of system B
(station No. 3).
MELSEC-Q
Description of setting
Set "Test between master station" or
"Test between slave station."
Set "Offline."
Set "Online."
Standby system
(system B)
Redundant Station
CPU No. 3
Set
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