Sonics PSKIT-H540 - Manual (Page 4)

FRONT & PLL BOARD SIDE
I
DB9 - PLC
/O Connection
Push to Manually
Fire Ultrasonics
Push to Rest an
Overload Condition
PLL BOARD (Phase-Lock-Loop): Working in tandem with the main board, the
primary purpose of the PLL board (also referred to as a control board)
comprises of automatic frequency tuning, energy functions and variable
amplitude settings.
PLC INTERFACING: Included with this manual is Sonics drawing #E-3113
which details customer supplied PLC I/O (input and output) connections to the
kits DB9 connector.
No user connections required.