Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 101)

Formatting and Interpreting Data Blocks
Chapter 7
7Ć19
The size of the parameter block you must provide depends on the number
of axes:
Number of Axes
Size of
Parameter Block
1 25 words
2 44 words
3 63 words
Your program must transfer the parameter block at power-up. After that,
the 1771-M3 controller calls for your program to send the parameter
block again only when you issue a new parameter or reset command.
Parameter Control Word
The parameter control word (Figure 7.9):
identifies the block as the parameter lock (bits 10-17)
specifies the units as either inch or metric (bit 7)
identifies the number of axes in the system (bit 0,1, and 2)
Figure 7.9
Parameter Block Control Word
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
0 1 0 0 0 0 0 0 0 0 0 0
Identifies this as
a parameter block
0 = Inch
1 = Metric
0
0
1
0
1
1
1 = 1
1 = 2
1 = 3
No. of Axes
Parameter Block Control word
Word 1
11031
Address Pointers
Words 2 through 5 specify the starting addresses of the parameter,
command, and first moveset block for each axis (Figure 7.10).