Rockwell Automation 1785-Vx0B, D17856.5.9 PLC-5 VME VMEbus Programmable Controllers User Manual - Manual (Page 83)

Chapter 6
PLC-5/VME Processor
Communications Commands
6-14
Integer Example
The first byte is the data-type field (field a), the 2-byte element contains
the data (field b).
01001010
Bit 76543210
00000010
00000000
a
b
ID = 4 for integer
Size = 2 bytes per element
LS
MS
value = 254
Floating-Point Example
The first two bytes are the data-type field (field a), the 4-byte element
contains the data (field b) which is single precision IEEE.
10010100
Bit 76543210
00001000
11111110
a
b
ID in next one byte
Size = 4 bytes per element
LS
MS
value not computed
11111110
11111110
11111110
ID = 8 for floating point
Control Structure Example
The first byte is the data-type field (field a), the 6-byte element contains
the data (field b).
01110110
Bit 76543210
00000000
00000000
a
b
ID = 7 for control,
Size = 6 bytes
value = 0
00000000
00000000
00000000
word 0 (LS)
(MS)
word 1 (LS)
(MS) 00000000
(MS)
word 2 (LS)