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CHAPTER 6 INSTALLATION AND WIRING
6
6.4 Tests After Wiring
6.4.1 Loop test
6.4 Tests After Wiring
This section describes loop and cable tests that should be performed after network wiring.
Perform these tests to the actual operating network configuration.
6.4.1 Loop test
The loop test checks each station's network line and parameter setting status to verify whether the network is
operating correctly. This test is executed from the master station.
The test completes approximately in 10 seconds.
The test allows checking of the following items:
(1) Performing a loop test
This section describes the procedure using the following system configuration example.
Item Description
Master station duplication check Checks if more than one master station exists on a network.
Submaster station duplication
check
Checks if more than one submaster station exists on a network.
Station number duplication check Checks if stations on the network are duplicated.
Out-of-range station No. check
Checks if the number of connected slave stations exceeds the number of slave stations
set to the master station.
Reserved station specification
check
Checks if the specified reserved stations are actually connected.
Consistency check of the number
of connected stations
Consistency check for the total number of slave stations set by parameters and actual
connected slave stations.
Station type check
Consistency check for the station type of slave stations set in master stations and actual
connected station type.
Loopback check
Detects whether loopback is being performed when "Use" is selected under "Loopback
Function Setting" in the network parameter window for the master station.
Master station
Slave station Slave station Slave station
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