Rockwell Automation 1395 Multi-Comm Hardware/Software - Manual (Page 65)

Chapter 3
Configuration & Interfacing
3–54
Autotune Measure Motor Inertia
Puts the Drive in the Autotune Mode for measuring motor inertia. When in
this mode the Drive gathers information about motor inertia by accelerating
and decelerating the motor under conditions controlled by the Autotune
firmware.
ATTENTION: When in the Autotune Mode the Drive controls
motor operation using a speed profile determined internally.
Carefully read the section on auto tuning sequencing prior to
using this command. Failure to do so could result in equipment
damage and possible injury to personnel. If autotuning is
performed under PLC control, a hardwired stop circuit or
manual disconnect circuit must be provided to disconnect power
to the motor.
PLC Block Transfer Data –
BTW Instruction Length: 4
BTR Instruction Length: 4
PLC DH+ Data –
Write Read
Size In Elements: 4 4
Processor Type: PLC–5 PLC–5
Destination Address: N15:0–3 N15:0–3
Message Structure –
Message Header Information:
Word 1: 0
Word 2: 0
Function Code, Word 3: 269
Write Message Length, Word 4: 8 bytes
WORD
0
0
269
8
BTW BTR
0
0
269
See Note
1
2
3
4
NOTE: Word 4 of the BTR instruction is broken down into
two bytes. The High byte contains the status bits
per table 3–H. The low byte contains the Drive
message length in bytes.