YOKOGAWA F3LR02-0N, User Manual

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C6-2
IM 34M06H45-01E 7th Edition : Aug.30, 2019-00
To enable loop switching, perform the following setup.
Table C6.2 Loop Switching
[Operation Control]
in the CPU Module’s Configuration Setup
Condition Switches of
F3LR02 Module
I/O Module Error
Subunit
Communication Error
SW1 SW3
Run Run (default) OFF ON
See Also C6.3.3 C6.3.3 C4.2.2 C4.2.4
Note
- For F3BP

, when the system switches to the secondary loop in the event of a
cable discontinuity in the primary loop, and when the system switches to 2 daisy-
chains in the event of cable discontinuity in both the primary and secondary loops,
accessing the subunit may cause an error. In such situations, you should include
program codes for retry processing.
- When the system switches from a loop configuration to two daisy chains due to
cable discontinuity or subunit power interruption, take note of the following
phenomena.
- Replacing a cable or switching on the subunit again in online mode may cause
an I/O error. Hence, always do so in offline mode (i.e., when the main unit and
all subunits are switched off).
- If cable discontinuity happens again, the transmission loop switching function
may not work. Furthermore, output states (reset or hold) are not assured.