Ch2 Self-Loopback Test - Mitsubishi Electric MELSEC Q Series User Manual

4 SET-UP AND PROCEDURE BEFORE OPERATION

4.8.2 CH2 self-loopback test

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Conduct a self-loopback test to check a hardware including the communication
function of the CH2 (RS-232 interface) of the Web server module.
(1) Operation mode setting for Web server module
(a) In "Switch setting for I/O and intelligent function module" of GX Developer,
set the mode "CH2 Self-loopback test". (Switch 1: 0003
(b) Write the PLC parameters to the programmable controller CPU.
(2) Execution of CH2 self-loopback test
(a) Connect the cable to the CH2 as shown below.
1
2
3
4
5
(b) Set the programmable controller CPU to a STOP status.
(c) Reset the programmable controller CPU.
(d) After the programmable controller CPU is reset, the following CH2 self-
loopback test is executed automatically.
This test repeats data communication and checks the consistency between
the send data and receive data.
During the test, the ERR. LED flickers and the CH2 SD/RD is on.
(3) Confirmation of CH2 self-loopback test result
(a) Check the CH2 self-loopback test result according to the ERR. LED status.
ERR. LED status
Off
On
(b) When the test is completed, set the mode to "Online" in "Switch setting for
I/O and intelligent function module" of GX Developer, and reset the
programmable controller CPU. (Switch 1: 0000
(c) When the test has failed, reconnect or rewire the cable correctly and
conduct the CH2 self-loopback test again to confirm that the test is
completed.
Pin No.
Signal abbreviation
1 CD(DCD)
RD(RXD)
2
6
3 SD(TXD)
7
4 ER(DTR)
5
8
6 DR(DSR)
9
7 RS(RTS)
8 CS(CTS)
9 CI(RI)
CH2 self-loopback test result
Completed
Failed
MELSEC-Q
)
H
Cable connection
SG
)
H
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