Individual Station Test; Rom/Ram/Switch Tests - Mitsubishi Electric QJ71C24N User Manual

4 SETTINGS AND PROCEDURES PRIOR TO OPERATION

4.7 Individual Station Test

4.7.1 ROM/RAM/switch tests

(Procedure 1) Communication protocol setting and transmission setting (see Section 4.5.2)
(Procedure 2) Performing ROM/RAM/switch tests
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After installing the Q series C24 to the base unit of QCPU, perform an individual station
test first to check the switch setting (see Section 4.5.2) and operation of the Q series C24.
POINT
(1) When a problem occurs during data communication with an external device,
perform an individual station test as described in this section to check whether
or not there is any problem in the operation of the Q series C24.
(2) In order to avoid problems, set the programmable controller CPU to STOP
status during the individual station test.
(3) Test both interfaces of the Q series C24 simultaneously in an individual station
loopback test.
Alternatively, either one of the interfaces can be tested in an individual station
loopback test.
In that case, ignore the test results on the interface side for which the test is not
performed.
(4) Cable removal and reconnection before and after the individual station
loopback test should be performed with the power to the Q series C24
mounting station turned off.
(5) To restart data communication with an external device after an individual
station test, check the specifications of the devices used before defining various
settings and reconnecting cables.
For the interface that is not used for communication (no cable connection), define
the switch settings in GX Developer as follows (for the setting method, see Section
4.5.2).
• Communication protocol setting: any of 0
• Transmission settings and communication rate settings: all set to OFF.
(6) If an error occurs even though the correct settings have been made for the Q
series C24 through an individual station test, please consult your local
Mitsubishi representative.
A ROM/RAM/switch test checks the contents of the memory of the Q series C24 and
the switch settings set with GX Developer.
Perform a ROM/RAM/switch test with the procedure described below.
(1) Set the communication protocol setting on the CH2 side to E
Set the communication protocol setting on the CH1 side to the number (1 to 9)
used for data communication with an external device following the test.
(2) Set the transmission settings for the two interfaces to match the specifications
used when communicating data with an external device.
(1) Set the programmable controller CPU to STOP status.
MELSEC-Q
to 7 , or 9
H H H
(ROM/RAM/switch test).
H
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