1 FUNCTIONS
1.5 Loopback Function
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Program that detects loopback station numbers (master operating station only)
By detecting loopback station numbers, a faulty station can be found. Whether loopback is being performed or not can be
checked using 'Network topology setting' (SB0078) and 'Loopback status' (SB0065) of the master operating station.
Program that stores loopback station numbers to 'wLoopbackStationNumber_1' (D1000) and 'wLoopbackStationNumber_2'
(D1001)
Precautions
■Support for the loopback function
To use the loopback function, check whether the master/local module on the master station supports the loopback function. To
check the support for the loopback function, refer to the following.
User's manual for the master/local module used
■Loopback function setting and network configuration
To use the loopback function, configure the network in ring topology and set "Network Topology" to "Ring" in "Basic Settings"
of the master station. If "Network Topology" and the network configuration are inconsistent, an error may occur in all stations
and data link cannot be performed.
Classification Label name Description Device
Module label GF11_1.bSts_DataLinkError Data link error status of own station SB0049
GF11_1.bOpe_Loopback Loopback status SB0065
GF11_1.bSet_RingTopology Network topology setting SB0078
GF11_1.wnVal_LoopbackStationNumber[1] Loopback station number 1 SW0070
GF11_1.wnVal_LoopbackStationNumber[2] Loopback station number 2 SW0071
Label to be defined Define global labels as shown below:
(3) When 'Network topology setting' (SB0078) and 'Loopback status' (SB0065) are on, 'Loopback station number 1' (SW0070) and 'Loopback station number 2'
(SW0071) are saved.
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