The coil driver switcher board (S2516512) was installed at U42 of the IYV2 rack as same as the ETMX case (klog#33152).
For the observation, we don't need to switch the coil drivers during lock acquisition procedures.
This is just a temporal implementation for that we want to keep IFO lock with HPCD in night time and to try using LPCD in daytime.
After we will confirm that IFO lock can be done with LPCD, switcher board will be removed from IYV2 and it will be moved to EY or IX.

At the end of this work, I confirmed that ITMY_TM can be driven by both HPCD (Fig.1) and LPCD (Fig.2).

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BIO wiring is completely same as the ETMX case.

DAC assignment for the LPCD output is different from ETMX because the channel assignment of the beacon system was different between ETMX (DAC#2 CH#12-15) and ITMY (DAC#2 CH#0-3). For the beacon system, anti-imaging filters are used special ones to pass through the 24kHz signal. So we cannot use same channels in order to apply proper anti-imaging filters for LPCD outputs. Such an implementation makes us confusing in future. So an implementation of the beacon system must be unified in all Type-A suspensions after O4.

This is similar work with klog33267.

Related to this model/hardware update, it is necessary to modify the LSC_LOCK guardian because BIO channel name was changed for HPCD.
So, I modified the LSC_LOCK guardian to activate the HPCD dwhitening filters.