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CHAPTER 4 SETTING AND PROCEDURE BEFORE OPERATION
4
4.3 Unit Tests of the MELSECNET/H Remote I/O Module (Offline Test)
4.3 Unit Tests of the MELSECNET/H Remote I/O Module
(Offline Test)
The MELSECNET/H remote I/O module and the connected cable shall be tested before performing the data link.
Select the test item with the mode setting switch on the front of the MELSECNET/H remote I/O module. The following
three items are provided for the offline test.
(1) Self-loopback test (Mode setting switch: 1)
This test checks the internal circuits including the send/receive circuits of the MELSECNET/H remote I/O module
together with the connected cable.
(2) Internal self-loopback test (Mode setting switch: 2)
This test checks the internal circuits including the send/receive circuits of the MELSECNET/H remote I/O module.
(3) Hardware test (Mode setting switch: 3)
This test checks the internal components of the MELSECNET/H remote I/O module.
● If the test completes with an error, the possible cause is a hardware failure of the MELSECNET/H remote I/O module.
Please consult your local Mitsubishi representative.
● The station-to-station test is not supported on the MELSECNET/H (MELSECNET/10 mode) remote I/O station. Perform
the forward/reverse loop test from the remote master station or the MELSECNET/10 remote I/O station.
Remark
If even one station is set to the test mode (offline, mode setting switch 1 to 3) during the data link (online), the normal data
link cannot be maintained.