Manual
Formatting and Interpreting Data Blocks
Chapter 7
719
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 W
ord
17161514131211100706050403020100
01 0000 00 0000
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).