Service manual

LLC Card
A-6 Revision L 96022
StorageTek Protected
When the firmware receives a move command, the code calculates move profiles
specifying position, velocity, and acceleration at a given point in time for each mechanism
involved. From this profile, along with position feedback from the motor, firmware
determines the current needed in the motor to effect the desired position. The motor
encoder, along with decode circuitry on the card, provides position feedback. When the
move is completed, firmware continues to monitor the motor position and the desired
position, and assures that the proper current remains until the next move command is
received.
The following table lists the LLC card connectors. See Figure 4-8 on page 4-31 for the
locations of the connectors on the card.
Table A-3. LLC Card Connectors
Connector Location
J4 Reserved
J16 HVD-LVD/SE SCSI selection jumpers
J17 SCSI terminator power-on/off jumpers
J18D HVD SCSI connector
J18LS LVD/SE SCSI connector
J20 Ethernet connector
J21 Expansion connector to LLV PCI bridge card
J27 CSE serial port
J28 Reserved
J29 Operator panel to LLC interface
J31 Hand to LLC interface
J33 Z motor controls
J39 Front door interlock
J40 LLC card fan
J42 LLC card power
J224 Drives 0 and 1 interface
J230 Personality module interface
J421 Power supply monitor
J424 Drives 2 and 3 interface
J624 Reserved
J824 Reserved