Mitsubishi Electric QJ71GF11-T2 - Checking Loopback Execution Status; Detecting Cable Disconnections

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CHAPTER 11 PROGRAMMING
11
11.4 Using Link Special Relay (SB) and Link Special Register (SW)
(4) Detecting cable disconnections
Cable disconnection is detected using the CC-Link IE Field Network diagnostics as well as link special relays
(SBs) and link special registers (SWs). ( Page 206, CHAPTER 9)
1. If a cable is disconnected, a baton pass error causes Baton pass status (own station) (SB0047) to
turn on.
2. 30
H
is stored in Cause of baton pass interruption (SW0048).
Details on the causes of error can be checked using link special relays (SBs) and link special registers (SWs)
corresponding to the station number where the error has occurred.
(5) Checking loopback execution status
Whether loopback is being performed or not can be checked using link special relays (SBs) and link special
registers (SWs). ( Page 206, CHAPTER 9)
1. While loopback is performed, Loopback status (SB0065) is on.
2. Loopback station numbers are stored to Loopback station number (SW0070 and SW0071).
Loopback when a cable is disconnected between station No. 2 and stations No. 3
SW0070 and SW0071 store "2" and "3", respectively.
Remark
If the master station is powered on before slave stations, data link may be reconfigured. During the reconfiguration
(maximum three seconds), an error is detected using SB00B0. (Note that an error is detected for a maximum of 13 seconds
in a master/local module with the serial number (first five digits) of "14041" or earlier.)
Starting up the master station last can prevent data link from being reconfigured.
Number Description Number Description
SB0047 Baton pass status (own station) SW0048 Cause of baton pass interruption
No. Description No. Description
SB0065 Loopback status SW0070 Loopback station number 1
 SW0071 Loopback station number 2
Ex.
Station No.0 Station No.1 Station No.2 Station No.3